git.sesse.net Git - nageru/blob - nageru/flags.cpp

   1 #include "flags.h"
   2 #include "defs.h"
   3 #include "shared/shared_defs.h"
   4 #include "ycbcr_interpretation.h"
   5
   6 #include <getopt.h>
   7 #include <math.h>
   8 #include <map>
   9 #include <movit/image_format.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include <string>
  15 #include <utility>
  16 #include <vector>
  17
  18 using namespace std;
  19
  20 Flags global_flags;
  21
  22 // Long options that have no corresponding short option.
  23 enum LongOption {
  24         OPTION_HELP = 1000,
  25         OPTION_FULLSCREEN,
  26         OPTION_MAX_NUM_CARDS,
  27         OPTION_MULTICHANNEL,
  28         OPTION_MIDI_MAPPING,
  29         OPTION_DEFAULT_HDMI_INPUT,
  30         OPTION_FAKE_CARDS_AUDIO,
  31         OPTION_V4L_OUTPUT,
  32         OPTION_HTTP_UNCOMPRESSED_VIDEO,
  33         OPTION_HTTP_X264_VIDEO,
  34         OPTION_HTTP_AV1_VIDEO,
  35         OPTION_RECORD_X264_VIDEO,
  36         OPTION_SEPARATE_X264_DISK_ENCODE,
  37         OPTION_X264_PRESET,
  38         OPTION_X264_TUNE,
  39         OPTION_X264_SPEEDCONTROL,
  40         OPTION_X264_SPEEDCONTROL_VERBOSE,
  41         OPTION_X264_BITRATE,
  42         OPTION_X264_CRF,
  43         OPTION_X264_VBV_BUFSIZE,
  44         OPTION_X264_VBV_MAX_BITRATE,
  45         OPTION_X264_PARAM,
  46         OPTION_X264_SEPARATE_DISK_PRESET,
  47         OPTION_X264_SEPARATE_DISK_TUNE,
  48         OPTION_X264_SEPARATE_DISK_BITRATE,
  49         OPTION_X264_SEPARATE_DISK_CRF,
  50         OPTION_X264_SEPARATE_DISK_PARAM,
  51         OPTION_AV1_PRESET,
  52         OPTION_AV1_BITRATE,
  53         OPTION_AV1_FPS,
  54         OPTION_AV1_PARAM,
  55         OPTION_HTTP_MUX,
  56         OPTION_HTTP_COARSE_TIMEBASE,
  57         OPTION_HTTP_AUDIO_CODEC,
  58         OPTION_HTTP_AUDIO_BITRATE,
  59         OPTION_HTTP_PORT,
  60         OPTION_SRT_PORT,
  61         OPTION_NO_SRT,
  62         OPTION_SRT_DESTINATION,
  63         OPTION_SRT_STREAMID,
  64         OPTION_SRT_PASSPHRASE,
  65         OPTION_SRT_YOUTUBE_STREAM_KEY,
  66         OPTION_SRT_LATENCY,
  67         OPTION_CEF,
  68         OPTION_NO_TRANSCODE_VIDEO,
  69         OPTION_NO_TRANSCODE_AUDIO,
  70         OPTION_DISABLE_AUDIO,
  71         OPTION_FLAT_AUDIO,
  72         OPTION_GAIN_STAGING,
  73         OPTION_DISABLE_LOCUT,
  74         OPTION_ENABLE_LOCUT,
  75         OPTION_DISABLE_GAIN_STAGING_AUTO,
  76         OPTION_ENABLE_GAIN_STAGING_AUTO,
  77         OPTION_DISABLE_COMPRESSOR,
  78         OPTION_ENABLE_COMPRESSOR,
  79         OPTION_DISABLE_LIMITER,
  80         OPTION_ENABLE_LIMITER,
  81         OPTION_DISABLE_MAKEUP_GAIN_AUTO,
  82         OPTION_ENABLE_MAKEUP_GAIN_AUTO,
  83         OPTION_DISABLE_ALSA_OUTPUT,
  84         OPTION_NO_FLUSH_PBOS,
  85         OPTION_PRINT_VIDEO_LATENCY,
  86         OPTION_MAX_INPUT_QUEUE_FRAMES,
  87         OPTION_AUDIO_QUEUE_LENGTH_MS,
  88         OPTION_OUTPUT_YCBCR_COEFFICIENTS,
  89         OPTION_OUTPUT_BUFFER_FRAMES,
  90         OPTION_OUTPUT_SLOP_FRAMES,
  91         OPTION_OUTPUT_CARD_UNSYNCHRONIZED,
  92         OPTION_TIMECODE_STREAM,
  93         OPTION_TIMECODE_STDOUT,
  94         OPTION_QUICK_CUT_KEYS,
  95         OPTION_10_BIT,
  96         OPTION_10_BIT_INPUT,
  97         OPTION_10_BIT_OUTPUT,
  98         OPTION_INPUT_YCBCR_INTERPRETATION,
  99         OPTION_MJPEG_EXPORT_CARDS,
 100 };
 101
 102 map<unsigned, unsigned> parse_mjpeg_export_cards(char *optarg)
 103 {
 104         map<unsigned, unsigned> ret;
 105         if (optarg[0] == '\0') {
 106                 return ret;
 107         }
 108
 109         unsigned stream_idx = 0;
 110         char *start = optarg;
 111         for ( ;; ) {
 112                 char *end = strchr(start, ',');
 113                 if (end != nullptr) {
 114                         *end = '\0';
 115                 }
 116
 117                 unsigned range_begin, range_end;
 118                 if (sscanf(start, "%u-%u", &range_begin, &range_end) != 2) {
 119                         range_begin = range_end = atoi(start);
 120                 }
 121                 if (range_end < range_begin) {
 122                         fprintf(stderr, "ERROR: Invalid range %u-%u in --mjpeg-export-cards=\n", range_begin, range_end);
 123                         exit(1);
 124                 }
 125                 if (range_end >= unsigned(global_flags.max_num_cards)) {
 126                         // There are situations where we could possibly want to
 127                         // include FFmpeg inputs (CEF inputs are unlikely),
 128                         // but they're not necessarily in 4:2:2 Y'CbCr, so it would
 129                         // require more functionality the the JPEG encoder.
 130                         fprintf(stderr, "ERROR: Asked for (zero-indexed) card %u in --mjpeg-export-cards=, but there are only %u cards\n",
 131                                 range_end, global_flags.max_num_cards);
 132                         exit(1);
 133                 }
 134                 for (unsigned card_idx = range_begin; card_idx <= range_end; ++card_idx) {
 135                         if (ret.count(card_idx)) {
 136                                 fprintf(stderr, "ERROR: Card %u was given twice in --mjpeg-export-cards=\n", card_idx);
 137                                 exit(1);
 138                         }
 139                         ret[card_idx] = stream_idx++;
 140                 }
 141                 if (end == nullptr) {
 142                         break;
 143                 } else {
 144                         start = end + 1;
 145                 }
 146         }
 147         return ret;
 148 }
 149
 150 void usage(Program program)
 151 {
 152         if (program == PROGRAM_KAERU) {
 153                 fprintf(stderr, "Usage: kaeru [OPTION]... SOURCE_URL\n");
 154         } else {
 155                 fprintf(stderr, "Usage: nageru [OPTION]...\n");
 156         }
 157         fprintf(stderr, "\n");
 158         fprintf(stderr, "      --help                      print usage information\n");
 159         if (program == PROGRAM_NAGERU) {
 160                 fprintf(stderr, "      --fullscreen                run in full screen, with no decorations\n");
 161         }
 162         fprintf(stderr, "  -w, --width                     output width in pixels (default 1280)\n");
 163         fprintf(stderr, "  -h, --height                    output height in pixels (default 720)\n");
 164         if (program == PROGRAM_NAGERU) {
 165                 fprintf(stderr, "  -c, --num-cards                 set minimum number of input cards (default 2)\n");
 166                 fprintf(stderr, "      --max-num-cards             set maximum number of input cards (default %d)\n", MAX_VIDEO_CARDS);
 167                 fprintf(stderr, "  -o, --output-card=CARD          also output signal to the given card (default none)\n");
 168                 fprintf(stderr, "  -t, --theme=FILE                choose theme (default theme.lua)\n");
 169                 fprintf(stderr, "  -I, --theme-dir=DIR             search for theme in this directory (can be given multiple times)\n");
 170                 fprintf(stderr, "  -r, --recording-dir=DIR         where to store disk recording\n");
 171                 fprintf(stderr, "  -v, --va-display=SPEC           VA-API device for H.264 encoding\n");
 172                 fprintf(stderr, "                                    ($DISPLAY spec or /dev/dri/render* path)\n");
 173                 fprintf(stderr, "  -m, --map-signal=SIGNAL,CARD    set a default card mapping (can be given multiple times)\n");
 174                 fprintf(stderr, "  -M, --input-mapping=FILE        start with the given audio input mapping (implies --multichannel)\n");
 175                 fprintf(stderr, "      --multichannel              start in multichannel audio mapping mode\n");
 176                 fprintf(stderr, "      --midi-mapping=FILE         start with the given MIDI controller mapping (implies --multichannel)\n");
 177                 fprintf(stderr, "      --default-hdmi-input        default to HDMI over SDI inputs for cards that have both\n");
 178                 fprintf(stderr, "      --fake-cards-audio          make fake (disconnected) cards output a simple tone\n");
 179                 fprintf(stderr, "      --v4l-output=DEVICE         send video (no audio) to V4L2 output/loopback\n");
 180                 fprintf(stderr, "      --http-x264-video           send x264-compressed video to HTTP clients\n");
 181                 fprintf(stderr, "      --record-x264-video         store x264-compressed video to disk (implies --http-x264-video,\n");
 182                 fprintf(stderr, "                                    removes the need for working VA-API encoding)\n");
 183                 fprintf(stderr, "      --separate-x264-disk-encode run a different x264 encoder for disk recording\n");
 184                 fprintf(stderr, "                                    (implies --record-x264-video)\n");
 185         }
 186         fprintf(stderr, "      --x264-preset               x264 quality preset (default " X264_DEFAULT_PRESET ")\n");
 187         fprintf(stderr, "      --x264-tune                 x264 tuning (default " X264_DEFAULT_TUNE ", can be blank)\n");
 188         fprintf(stderr, "      --x264-speedcontrol         try to match x264 preset to available CPU speed\n");
 189         fprintf(stderr, "      --x264-bitrate              x264 bitrate (in kilobit/sec, default %d)\n",
 190                 DEFAULT_X264_OUTPUT_BIT_RATE);
 191         fprintf(stderr, "      --x264-crf=VALUE            quality-based VBR (-12 to 51), incompatible with --x264-bitrate\n");
 192         fprintf(stderr, "      --x264-param=NAME[,VALUE]   set any x264 parameter, for fine tuning\n");
 193         if (program == PROGRAM_NAGERU) {
 194                 fprintf(stderr, "      --x264-separate-disk-preset x264 quality preset (default " X264_DEFAULT_PRESET ")\n");
 195                 fprintf(stderr, "      --x264-separate-disk-tune   x264 tuning (default " X264_DEFAULT_TUNE ", can be blank)\n");
 196                 fprintf(stderr, "      --x264-separate-disk-bitrate  x264 bitrate (in kilobit/sec, default %d)\n",
 197                         DEFAULT_X264_OUTPUT_BIT_RATE);
 198                 fprintf(stderr, "      --x264-separate-disk-crf=VALUE  quality-based VBR (-12 to 51), \n");
 199                 fprintf(stderr, "                                  incompatible with --x264-separate-disk-bitrate\n");
 200                 fprintf(stderr, "      --x264-separate-disk-param=NAME[,VALUE] set any x264 parameter, for fine tuning\n");
 201         }
 202 #ifdef HAVE_AV1
 203         fprintf(stderr, "      --http-av1-video            send AV1-compressed video to HTTP clients and SRT output\n");
 204         fprintf(stderr, "      --av1-preset                SVT-AV1 quality preset (default %d, from -2 to 13)\n",
 205                 DEFAULT_AV1_PRESET);
 206         fprintf(stderr, "      --av1-bitrate               AV1 bitrate (in kilobit/sec, default %d)\n",
 207                 DEFAULT_AV1_OUTPUT_BIT_RATE);
 208         fprintf(stderr, "      --av1-fps=NUM[/DEN]         AV1 encoded frame rate (default %d/%d)\n",
 209                 DEFAULT_AV1_FPS_NUM, DEFAULT_AV1_FPS_DEN);
 210         fprintf(stderr, "      --av1-param=NAME[,VALUE]    set any SVT-AV1 parameter, for fine tuning\n");
 211 #endif
 212         fprintf(stderr, "      --http-mux=NAME             mux to use for HTTP streams (default " DEFAULT_STREAM_MUX_NAME ")\n");
 213         fprintf(stderr, "      --http-audio-codec=NAME     audio codec to use for HTTP streams and SRT output\n");
 214         fprintf(stderr, "                                  (default is to use the same as for the recording)\n");
 215         fprintf(stderr, "      --http-audio-bitrate=KBITS  audio codec bit rate to use for HTTP streams and SRT output\n");
 216         fprintf(stderr, "                                  (default is %d, ignored unless --http-audio-codec is set)\n",
 217                 DEFAULT_AUDIO_OUTPUT_BIT_RATE / 1000);
 218         fprintf(stderr, "      --http-port=PORT            which port to use for the built-in HTTP server\n");
 219         fprintf(stderr, "                                  (default is %d)\n", DEFAULT_HTTPD_PORT);
 220 #ifdef HAVE_SRT
 221         fprintf(stderr, "      --srt-port=PORT             which port to use for receiving SRT streams\n");
 222         fprintf(stderr, "                                  (default is %d)\n", DEFAULT_SRT_PORT);
 223         fprintf(stderr, "      --no-srt                    disable receiving SRT streams\n");
 224 #endif
 225         if (program == PROGRAM_KAERU) {
 226 #ifdef HAVE_CEF
 227                 fprintf(stderr, "      --cef                       render input as a web page (implies --disable-audio)\n");
 228 #endif
 229                 fprintf(stderr, "      --no-transcode-video        copy encoded video raw from the source stream\n");
 230                 fprintf(stderr, "                                    (experimental, must be H.264)\n");
 231                 fprintf(stderr, "      --no-transcode-audio        copy encoded audio raw from the source stream\n");
 232                 fprintf(stderr, "                                    (requires --http-audio-codec= to be set)\n");
 233                 fprintf(stderr, "      --disable-audio             do not include any audio in the stream\n");
 234         }
 235         if (program == PROGRAM_NAGERU) {
 236 #ifdef HAVE_SRT
 237                 fprintf(stderr, "      --srt-destination=HOST:PORT  send HTTP video stream also to given destination\n");
 238                 fprintf(stderr, "      --srt-streamid=STREAMID     SRT stream identifying ID\n");
 239                 fprintf(stderr, "      --srt-passphrase=PASSPHRASE  SRT encryption key\n");
 240                 fprintf(stderr, "      --srt-youtube-stream-key=KEY  shortcut for --srt-destination=a.srt.youtube.com:2010\n");
 241                 fprintf(stderr, "                                    --srt-streamid=#!::u=<KEY>,copy=0,encoder=Nageru\n");
 242                 fprintf(stderr, "      --srt-latency=MS            output SRT latency in milliseconds (default is %d)\n", DEFAULT_SRT_OUTPUT_LATENCY_MS);
 243 #endif
 244                 fprintf(stderr, "      --flat-audio                start with most audio processing turned off\n");
 245                 fprintf(stderr, "                                    (can be overridden by e.g. --enable-limiter)\n");
 246                 fprintf(stderr, "      --gain-staging=DB           set initial gain staging to the given value\n");
 247                 fprintf(stderr, "                                    (--disable-gain-staging-auto)\n");
 248                 fprintf(stderr, "      --disable-locut             turn off locut filter (also --enable)\n");
 249                 fprintf(stderr, "      --disable-gain-staging-auto  turn off automatic gain staging (also --enable)\n");
 250                 fprintf(stderr, "      --disable-compressor        turn off regular compressor (also --enable)\n");
 251                 fprintf(stderr, "      --disable-limiter           turn off limiter (also --enable)\n");
 252                 fprintf(stderr, "      --disable-makeup-gain-auto  turn off auto-adjustment of final makeup gain (also --enable)\n");
 253                 fprintf(stderr, "      --disable-alsa-output       disable audio monitoring via ALSA\n");
 254                 fprintf(stderr, "      --print-video-latency       print out measurements of video latency on stdout\n");
 255                 fprintf(stderr, "      --max-input-queue-frames=FRAMES  never keep more than FRAMES frames for each card\n");
 256                 fprintf(stderr, "                                    (default 6, minimum 1)\n");
 257                 fprintf(stderr, "      --audio-queue-length-ms=MS  length of audio resampling queue (default 100.0)\n");
 258                 fprintf(stderr, "      --output-ycbcr-coefficients={rec601,rec709,auto}\n");
 259                 fprintf(stderr, "                                  Y'CbCr coefficient standard of output (default auto)\n");
 260                 fprintf(stderr, "                                    auto is rec601, unless --output-card is used\n");
 261                 fprintf(stderr, "                                    and a Rec. 709 mode (typically HD modes) is in use\n");
 262                 fprintf(stderr, "      --output-buffer-frames=NUM  number of frames in output buffer for --output-card,\n");
 263                 fprintf(stderr, "                                    can be fractional (default 6.0); note also\n");
 264                 fprintf(stderr, "                                    the audio queue can't be much longer than this\n");
 265                 fprintf(stderr, "      --output-slop-frames=NUM    if more less than this number of frames behind for\n");
 266                 fprintf(stderr, "                                    --output-card, try to submit anyway instead of\n");
 267                 fprintf(stderr, "                                    dropping the frame (default 0.5)\n");
 268                 fprintf(stderr, "      --output-card-unsynchronized  if --output-card is in use, do _not_ use it as\n");
 269                 fprintf(stderr, "                                  master clock (may give jittery output and audio breakups)\n");
 270                 fprintf(stderr, "      --timecode-stream           show timestamp and timecode in stream\n");
 271                 fprintf(stderr, "      --timecode-stdout           show timestamp and timecode on standard output\n");
 272                 fprintf(stderr, "      --quick-cut-keys            enable direct cutting by Q, W, E, ... keys\n");
 273                 fprintf(stderr, "      --10-bit                    use 10-bit color depth\n");
 274                 fprintf(stderr, "      --input-ycbcr-interpretation=CARD,{rec601,rec709,auto}[,{limited,full}]\n");
 275                 fprintf(stderr, "                                  Y'CbCr coefficient standard of card CARD (default auto)\n");
 276                 fprintf(stderr, "                                    auto is rec601 for SD, rec709 for HD, always limited\n");
 277                 fprintf(stderr, "                                    limited means standard 0-240/0-235 input range (for 8-bit)\n");
 278                 fprintf(stderr, "      --mjpeg-export-cards=RANGE[,RANGE...]\n");
 279                 fprintf(stderr, "                                  export the given cards in MJPEG format to /multicam.mp4,\n");
 280                 fprintf(stderr, "                                    in the given order (ranges can be either single card indexes\n");
 281                 fprintf(stderr, "                                    or pairs like 1-3 for camera 1,2,3; default is all cards)\n");
 282         }
 283 }
 284
 285 void parse_flags(Program program, int argc, char * const argv[])
 286 {
 287         static const option long_options[] = {
 288                 { "help", no_argument, 0, OPTION_HELP },
 289                 { "fullscreen", no_argument, 0, OPTION_FULLSCREEN },
 290                 { "width", required_argument, 0, 'w' },
 291                 { "height", required_argument, 0, 'h' },
 292                 { "num-cards", required_argument, 0, 'c' },
 293                 { "max-num-cards", required_argument, 0, OPTION_MAX_NUM_CARDS },
 294                 { "output-card", required_argument, 0, 'o' },
 295                 { "theme", required_argument, 0, 't' },
 296                 { "theme-dir", required_argument, 0, 'I' },
 297                 { "recording-dir", required_argument, 0, 'r' },
 298                 { "map-signal", required_argument, 0, 'm' },
 299                 { "input-mapping", required_argument, 0, 'M' },
 300                 { "va-display", required_argument, 0, 'v' },
 301                 { "multichannel", no_argument, 0, OPTION_MULTICHANNEL },
 302                 { "midi-mapping", required_argument, 0, OPTION_MIDI_MAPPING },
 303                 { "default-hdmi-input", no_argument, 0, OPTION_DEFAULT_HDMI_INPUT },
 304                 { "fake-cards-audio", no_argument, 0, OPTION_FAKE_CARDS_AUDIO },
 305                 { "v4l-output", required_argument, 0, OPTION_V4L_OUTPUT },
 306                 { "http-x264-video", no_argument, 0, OPTION_HTTP_X264_VIDEO },
 307                 { "record-x264-video", no_argument, 0, OPTION_RECORD_X264_VIDEO },
 308                 { "separate-x264-disk-encode", no_argument, 0, OPTION_SEPARATE_X264_DISK_ENCODE },
 309                 { "x264-preset", required_argument, 0, OPTION_X264_PRESET },
 310                 { "x264-tune", required_argument, 0, OPTION_X264_TUNE },
 311                 { "x264-speedcontrol", no_argument, 0, OPTION_X264_SPEEDCONTROL },
 312                 { "x264-crf", required_argument, 0, OPTION_X264_CRF },
 313                 { "x264-param", required_argument, 0, OPTION_X264_PARAM },
 314                 { "x264-separate-disk-preset", required_argument, 0, OPTION_X264_SEPARATE_DISK_PRESET },
 315                 { "x264-separate-disk-tune", required_argument, 0, OPTION_X264_SEPARATE_DISK_TUNE },
 316                 { "x264-separate-disk-bitrate", required_argument, 0, OPTION_X264_SEPARATE_DISK_BITRATE },
 317                 { "x264-separate-disk-crf", required_argument, 0, OPTION_X264_SEPARATE_DISK_CRF },
 318                 { "x264-separate-disk-param", required_argument, 0, OPTION_X264_SEPARATE_DISK_PARAM },
 319 #ifdef HAVE_AV1
 320                 { "http-av1-video", no_argument, 0, OPTION_HTTP_AV1_VIDEO },
 321                 { "av1-preset", required_argument, 0, OPTION_AV1_PRESET },
 322                 { "av1-bitrate", required_argument, 0, OPTION_AV1_BITRATE },
 323                 { "av1-fps", required_argument, 0, OPTION_AV1_FPS },
 324                 { "av1-param", required_argument, 0, OPTION_AV1_PARAM },
 325 #endif
 326                 { "http-mux", required_argument, 0, OPTION_HTTP_MUX },
 327                 { "http-audio-codec", required_argument, 0, OPTION_HTTP_AUDIO_CODEC },
 328                 { "http-audio-bitrate", required_argument, 0, OPTION_HTTP_AUDIO_BITRATE },
 329                 { "http-port", required_argument, 0, OPTION_HTTP_PORT },
 330 #ifdef HAVE_SRT
 331                 { "srt-port", required_argument, 0, OPTION_SRT_PORT },
 332 #endif
 333                 { "no-srt", no_argument, 0, OPTION_NO_SRT },  // We silently allow this even without HAVE_SRT.
 334 #ifdef HAVE_SRT
 335                 { "srt-destination", required_argument, 0, OPTION_SRT_DESTINATION },
 336                 { "srt-streamid", required_argument, 0, OPTION_SRT_STREAMID },
 337                 { "srt-passphrase", required_argument, 0, OPTION_SRT_PASSPHRASE },
 338                 { "srt-youtube-stream-key", required_argument, 0, OPTION_SRT_YOUTUBE_STREAM_KEY },
 339                 { "srt-latency", required_argument, 0, OPTION_SRT_LATENCY },
 340 #endif
 341 #ifdef HAVE_CEF
 342                 { "cef", no_argument, 0, OPTION_CEF },
 343 #endif
 344                 { "no-transcode-video", no_argument, 0, OPTION_NO_TRANSCODE_VIDEO },
 345                 { "no-transcode-audio", no_argument, 0, OPTION_NO_TRANSCODE_AUDIO },
 346                 { "disable-audio", no_argument, 0, OPTION_DISABLE_AUDIO },
 347                 { "flat-audio", no_argument, 0, OPTION_FLAT_AUDIO },
 348                 { "gain-staging", required_argument, 0, OPTION_GAIN_STAGING },
 349                 { "disable-locut", no_argument, 0, OPTION_DISABLE_LOCUT },
 350                 { "enable-locut", no_argument, 0, OPTION_ENABLE_LOCUT },
 351                 { "disable-gain-staging-auto", no_argument, 0, OPTION_DISABLE_GAIN_STAGING_AUTO },
 352                 { "enable-gain-staging-auto", no_argument, 0, OPTION_ENABLE_GAIN_STAGING_AUTO },
 353                 { "disable-compressor", no_argument, 0, OPTION_DISABLE_COMPRESSOR },
 354                 { "enable-compressor", no_argument, 0, OPTION_ENABLE_COMPRESSOR },
 355                 { "disable-limiter", no_argument, 0, OPTION_DISABLE_LIMITER },
 356                 { "enable-limiter", no_argument, 0, OPTION_ENABLE_LIMITER },
 357                 { "disable-makeup-gain-auto", no_argument, 0, OPTION_DISABLE_MAKEUP_GAIN_AUTO },
 358                 { "enable-makeup-gain-auto", no_argument, 0, OPTION_ENABLE_MAKEUP_GAIN_AUTO },
 359                 { "disable-alsa-output", no_argument, 0, OPTION_DISABLE_ALSA_OUTPUT },
 360                 { "print-video-latency", no_argument, 0, OPTION_PRINT_VIDEO_LATENCY },
 361                 { "max-input-queue-frames", required_argument, 0, OPTION_MAX_INPUT_QUEUE_FRAMES },
 362                 { "audio-queue-length-ms", required_argument, 0, OPTION_AUDIO_QUEUE_LENGTH_MS },
 363                 { "output-ycbcr-coefficients", required_argument, 0, OPTION_OUTPUT_YCBCR_COEFFICIENTS },
 364                 { "output-buffer-frames", required_argument, 0, OPTION_OUTPUT_BUFFER_FRAMES },
 365                 { "output-slop-frames", required_argument, 0, OPTION_OUTPUT_SLOP_FRAMES },
 366                 { "output-card-unsynchronized", no_argument, 0, OPTION_OUTPUT_CARD_UNSYNCHRONIZED },
 367                 { "timecode-stream", no_argument, 0, OPTION_TIMECODE_STREAM },
 368                 { "timecode-stdout", no_argument, 0, OPTION_TIMECODE_STDOUT },
 369                 { "quick-cut-keys", no_argument, 0, OPTION_QUICK_CUT_KEYS },
 370                 { "10-bit", no_argument, 0, OPTION_10_BIT },
 371                 { "input-ycbcr-interpretation", required_argument, 0, OPTION_INPUT_YCBCR_INTERPRETATION },
 372                 { "mjpeg-export-cards", required_argument, 0, OPTION_MJPEG_EXPORT_CARDS },
 373
 374                 // Do not explicitly signal texture data uploads (will give
 375                 // display corruption, but makes it possible to run with
 376                 // apitrace in real time). For developers only, so undocumented.
 377                 { "no-flush-pbos", no_argument, 0, OPTION_NO_FLUSH_PBOS },
 378
 379                 // Output speedcontrol debugging statistics. For developers only,
 380                 // so undocumented (users can get this information from Prometheus
 381                 // statistics, too).
 382                 { "x264-speedcontrol-verbose", no_argument, 0, OPTION_X264_SPEEDCONTROL_VERBOSE },
 383
 384                 // Deprecated variants.
 385                 { "10-bit-input", no_argument, 0, OPTION_10_BIT_INPUT },
 386                 { "10-bit-output", no_argument, 0, OPTION_10_BIT_OUTPUT },
 387
 388                 { 0, 0, 0, 0 }
 389         };
 390         vector<string> theme_dirs;
 391         string output_ycbcr_coefficients = "auto";
 392         bool card_to_mjpeg_stream_export_set = false;
 393         for ( ;; ) {
 394                 int option_index = 0;
 395                 int c = getopt_long(argc, argv, "c:o:t:I:r:v:m:M:w:h:", long_options, &option_index);
 396
 397                 if (c == -1) {
 398                         break;
 399                 }
 400                 switch (c) {
 401                 case 'w':
 402                         global_flags.width = atoi(optarg);
 403                         break;
 404                 case 'h':
 405                         global_flags.height = atoi(optarg);
 406                         break;
 407                 case 'c':
 408                         global_flags.min_num_cards = atoi(optarg);
 409                         break;
 410                 case OPTION_MAX_NUM_CARDS:
 411                         global_flags.max_num_cards = atoi(optarg);
 412                         break;
 413                 case 'o':
 414                         global_flags.output_card = atoi(optarg);
 415                         break;
 416                 case 't':
 417                         global_flags.theme_filename = optarg;
 418                         break;
 419                 case 'I':
 420                         theme_dirs.push_back(optarg);
 421                         break;
 422                 case 'r':
 423                         global_flags.recording_dir = optarg;
 424                         break;
 425                 case 'm': {
 426                         char *ptr = strchr(optarg, ',');
 427                         if (ptr == nullptr) {
 428                                 fprintf(stderr, "ERROR: Invalid argument '%s' to --map-signal (needs a signal and a card number, separated by comma)\n", optarg);
 429                                 exit(1);
 430                         }
 431                         *ptr = '\0';
 432                         const int signal_num = atoi(optarg);
 433                         const int card_num = atoi(ptr + 1);
 434                         if (global_flags.default_stream_mapping.count(signal_num)) {
 435                                 fprintf(stderr, "ERROR: Signal %d already mapped to card %d\n",
 436                                         signal_num, global_flags.default_stream_mapping[signal_num]);
 437                                 exit(1);
 438                         }
 439                         global_flags.default_stream_mapping[signal_num] = card_num;
 440                         break;
 441                 }
 442                 case 'M':
 443                         global_flags.input_mapping_filename = optarg;
 444                         break;
 445                 case OPTION_MULTICHANNEL:
 446                         global_flags.multichannel_mapping_mode = true;
 447                         break;
 448                 case 'v':
 449                         global_flags.va_display = optarg;
 450                         break;
 451                 case OPTION_MIDI_MAPPING:
 452                         global_flags.midi_mapping_filename = optarg;
 453                         global_flags.multichannel_mapping_mode = true;
 454                         break;
 455                 case OPTION_DEFAULT_HDMI_INPUT:
 456                         global_flags.default_hdmi_input = true;
 457                         break;
 458                 case OPTION_FAKE_CARDS_AUDIO:
 459                         global_flags.fake_cards_audio = true;
 460                         break;
 461                 case OPTION_V4L_OUTPUT:
 462                         global_flags.v4l_output_device = optarg;
 463                         break;
 464                 case OPTION_HTTP_MUX:
 465                         global_flags.stream_mux_name = optarg;
 466                         break;
 467                 case OPTION_HTTP_AUDIO_CODEC:
 468                         global_flags.stream_audio_codec_name = optarg;
 469                         break;
 470                 case OPTION_HTTP_AUDIO_BITRATE:
 471                         global_flags.stream_audio_codec_bitrate = atoi(optarg) * 1000;
 472                         break;
 473                 case OPTION_HTTP_PORT:
 474                         global_flags.http_port = atoi(optarg);
 475                         break;
 476 #ifdef HAVE_SRT
 477                 case OPTION_SRT_PORT:
 478                         global_flags.srt_port = atoi(optarg);
 479                         break;
 480 #endif
 481                 case OPTION_NO_SRT:
 482                         global_flags.srt_port = -1;
 483                         break;
 484 #ifdef HAVE_SRT
 485                 case OPTION_SRT_DESTINATION: {
 486                         const char *ptr = strrchr(optarg, ':');
 487                         if (ptr == nullptr || strlen(optarg) < 3) {
 488                                 fprintf(stderr, "ERROR: --srt-destination must be of the form host:port\n");
 489                                 exit(1);
 490                         }
 491                         global_flags.srt_destination_host = string(optarg, ptr - optarg);
 492                         if (global_flags.srt_destination_host[0] == '[' &&
 493                             global_flags.srt_destination_host.back() == ']') {
 494                                 // Support [IPv6]:port, in a sort of hackish way.
 495                                 global_flags.srt_destination_host = global_flags.srt_destination_host.substr(1, global_flags.srt_destination_host.size() - 2);
 496                         }
 497                         global_flags.srt_destination_port = ptr + 1;
 498                         break;
 499                 }
 500                 case OPTION_SRT_STREAMID:
 501                         global_flags.srt_streamid = optarg;
 502                         break;
 503                 case OPTION_SRT_PASSPHRASE:
 504                         global_flags.srt_passphrase = optarg;
 505                         break;
 506                 case OPTION_SRT_YOUTUBE_STREAM_KEY:
 507                         global_flags.srt_destination_host = "a.srt.youtube.com";
 508                         global_flags.srt_destination_port = "2010";
 509                         global_flags.srt_streamid = string("#!::u=") + optarg + ",copy=0,encoder=Nageru " NAGERU_VERSION;
 510                         break;
 511                 case OPTION_SRT_LATENCY:
 512                         global_flags.srt_output_latency_ms = atoi(optarg);
 513                         break;
 514 #endif
 515                 case OPTION_CEF:
 516                         global_flags.use_cef = true;
 517                         global_flags.enable_audio = false;
 518                         break;
 519                 case OPTION_NO_TRANSCODE_VIDEO:
 520                         global_flags.transcode_video = false;
 521                         break;
 522                 case OPTION_NO_TRANSCODE_AUDIO:
 523                         global_flags.transcode_audio = false;
 524                         break;
 525                 case OPTION_DISABLE_AUDIO:
 526                         global_flags.transcode_audio = false;
 527                         global_flags.enable_audio = false;
 528                         break;
 529                 case OPTION_HTTP_X264_VIDEO:
 530                         global_flags.x264_video_to_http = true;
 531                         break;
 532                 case OPTION_RECORD_X264_VIDEO:
 533                         global_flags.x264_video_to_disk = true;
 534                         break;
 535                 case OPTION_SEPARATE_X264_DISK_ENCODE:
 536                         global_flags.x264_video_to_disk = true;
 537                         global_flags.x264_video_to_http = true;
 538                         global_flags.x264_separate_disk_encode = true;
 539                         break;
 540                 case OPTION_HTTP_AV1_VIDEO:
 541                         global_flags.av1_video_to_http = true;
 542                         break;
 543                 case OPTION_X264_PRESET:
 544                         global_flags.x264_preset = optarg;
 545                         break;
 546                 case OPTION_X264_TUNE:
 547                         global_flags.x264_tune = optarg;
 548                         break;
 549                 case OPTION_X264_SPEEDCONTROL:
 550                         global_flags.x264_speedcontrol = true;
 551                         break;
 552                 case OPTION_X264_SPEEDCONTROL_VERBOSE:
 553                         global_flags.x264_speedcontrol_verbose = true;
 554                         break;
 555                 case OPTION_X264_BITRATE:
 556                         global_flags.x264_bitrate = atoi(optarg);
 557                         break;
 558                 case OPTION_X264_CRF:
 559                         global_flags.x264_crf = atof(optarg);
 560                         break;
 561                 case OPTION_X264_PARAM:
 562                         global_flags.x264_extra_param.push_back(optarg);
 563                         break;
 564                 case OPTION_X264_SEPARATE_DISK_PRESET:
 565                         global_flags.x264_separate_disk_preset = optarg;
 566                         break;
 567                 case OPTION_X264_SEPARATE_DISK_TUNE:
 568                         global_flags.x264_separate_disk_tune = optarg;
 569                         break;
 570                 case OPTION_X264_SEPARATE_DISK_BITRATE:
 571                         global_flags.x264_separate_disk_bitrate = atoi(optarg);
 572                         break;
 573                 case OPTION_X264_SEPARATE_DISK_CRF:
 574                         global_flags.x264_separate_disk_crf = atof(optarg);
 575                         break;
 576                 case OPTION_X264_SEPARATE_DISK_PARAM:
 577                         global_flags.x264_separate_disk_extra_param.push_back(optarg);
 578                         break;
 579                 case OPTION_AV1_PRESET:
 580                         global_flags.av1_preset = atoi(optarg);
 581                         break;
 582                 case OPTION_AV1_BITRATE:
 583                         global_flags.av1_bitrate = atoi(optarg);
 584                         break;
 585                 case OPTION_AV1_FPS: {
 586                         string str = optarg;
 587                         const size_t pos = str.find('/');
 588                         if (pos == string::npos) {
 589                                 global_flags.av1_fps_num = stoi(str);
 590                                 global_flags.av1_fps_den = 1;
 591                         } else {
 592                                 const string num = str.substr(0, pos);
 593                                 const string den = str.substr(pos + 1);
 594                                 global_flags.av1_fps_num = stoi(num);
 595                                 global_flags.av1_fps_den = stoi(den);
 596                         }
 597                         break;
 598                 }
 599                 case OPTION_AV1_PARAM:
 600                         global_flags.av1_extra_param.push_back(optarg);
 601                         break;
 602                 case OPTION_FLAT_AUDIO:
 603                         // If --flat-audio is given, turn off everything that messes with the sound,
 604                         // except the final makeup gain.
 605                         global_flags.locut_enabled = false;
 606                         global_flags.gain_staging_auto = false;
 607                         global_flags.compressor_enabled = false;
 608                         global_flags.limiter_enabled = false;
 609                         break;
 610                 case OPTION_GAIN_STAGING:
 611                         global_flags.initial_gain_staging_db = atof(optarg);
 612                         global_flags.gain_staging_auto = false;
 613                         break;
 614                 case OPTION_DISABLE_LOCUT:
 615                         global_flags.locut_enabled = false;
 616                         break;
 617                 case OPTION_ENABLE_LOCUT:
 618                         global_flags.locut_enabled = true;
 619                         break;
 620                 case OPTION_DISABLE_GAIN_STAGING_AUTO:
 621                         global_flags.gain_staging_auto = false;
 622                         break;
 623                 case OPTION_ENABLE_GAIN_STAGING_AUTO:
 624                         global_flags.gain_staging_auto = true;
 625                         break;
 626                 case OPTION_DISABLE_COMPRESSOR:
 627                         global_flags.compressor_enabled = false;
 628                         break;
 629                 case OPTION_ENABLE_COMPRESSOR:
 630                         global_flags.compressor_enabled = true;
 631                         break;
 632                 case OPTION_DISABLE_LIMITER:
 633                         global_flags.limiter_enabled = false;
 634                         break;
 635                 case OPTION_ENABLE_LIMITER:
 636                         global_flags.limiter_enabled = true;
 637                         break;
 638                 case OPTION_DISABLE_MAKEUP_GAIN_AUTO:
 639                         global_flags.final_makeup_gain_auto = false;
 640                         break;
 641                 case OPTION_ENABLE_MAKEUP_GAIN_AUTO:
 642                         global_flags.final_makeup_gain_auto = true;
 643                         break;
 644                 case OPTION_DISABLE_ALSA_OUTPUT:
 645                         global_flags.enable_alsa_output = false;
 646                         break;
 647                 case OPTION_NO_FLUSH_PBOS:
 648                         global_flags.flush_pbos = false;
 649                         break;
 650                 case OPTION_PRINT_VIDEO_LATENCY:
 651                         global_flags.print_video_latency = true;
 652                         break;
 653                 case OPTION_MAX_INPUT_QUEUE_FRAMES:
 654                         global_flags.max_input_queue_frames = atoi(optarg);
 655                         break;
 656                 case OPTION_AUDIO_QUEUE_LENGTH_MS:
 657                         global_flags.audio_queue_length_ms = atof(optarg);
 658                         break;
 659                 case OPTION_OUTPUT_YCBCR_COEFFICIENTS:
 660                         output_ycbcr_coefficients = optarg;
 661                         break;
 662                 case OPTION_OUTPUT_BUFFER_FRAMES:
 663                         global_flags.output_buffer_frames = atof(optarg);
 664                         break;
 665                 case OPTION_OUTPUT_SLOP_FRAMES:
 666                         global_flags.output_slop_frames = atof(optarg);
 667                         break;
 668                 case OPTION_OUTPUT_CARD_UNSYNCHRONIZED:
 669                         global_flags.output_card_is_master = false;
 670                         break;
 671                 case OPTION_TIMECODE_STREAM:
 672                         global_flags.display_timecode_in_stream = true;
 673                         break;
 674                 case OPTION_TIMECODE_STDOUT:
 675                         global_flags.display_timecode_on_stdout = true;
 676                         break;
 677                 case OPTION_QUICK_CUT_KEYS:
 678                         global_flags.enable_quick_cut_keys = true;
 679                         break;
 680                 case OPTION_10_BIT_INPUT:
 681                         fprintf(stderr, "NOTE: --10-bit-input is a deprecated alias for --10-bit.\n");
 682                         global_flags.bit_depth = 10;
 683                         break;
 684                 case OPTION_10_BIT_OUTPUT:
 685                         fprintf(stderr, "NOTE: --10-bit-output is a deprecated alias for --10-bit.\n");
 686                         global_flags.bit_depth = 10;
 687                         break;
 688                 case OPTION_10_BIT:
 689                         global_flags.bit_depth = 10;
 690                         break;
 691                 case OPTION_INPUT_YCBCR_INTERPRETATION: {
 692                         char *ptr = strchr(optarg, ',');
 693                         if (ptr == nullptr) {
 694                                 fprintf(stderr, "ERROR: Invalid argument '%s' to --input-ycbcr-interpretation (needs a card and an interpretation, separated by comma)\n", optarg);
 695                                 exit(1);
 696                         }
 697                         *ptr = '\0';
 698                         const int card_num = atoi(optarg);
 699                         if (card_num < 0 || card_num >= MAX_VIDEO_CARDS) {
 700                                 fprintf(stderr, "ERROR: Invalid card number %d\n", card_num);
 701                                 exit(1);
 702                         }
 703
 704                         YCbCrInterpretation interpretation;
 705                         char *interpretation_str = ptr + 1;
 706                         ptr = strchr(interpretation_str, ',');
 707                         if (ptr != nullptr) {
 708                                 *ptr = '\0';
 709                                 const char *range = ptr + 1;
 710                                 if (strcmp(range, "full") == 0) {
 711                                         interpretation.full_range = true;
 712                                 } else if (strcmp(range, "limited") == 0) {
 713                                         interpretation.full_range = false;
 714                                 } else {
 715                                         fprintf(stderr, "ERROR: Invalid Y'CbCr range '%s' (must be “full” or “limited”)\n", range);
 716                                         exit(1);
 717                                 }
 718                         }
 719
 720                         if (strcmp(interpretation_str, "rec601") == 0) {
 721                                 interpretation.ycbcr_coefficients_auto = false;
 722                                 interpretation.ycbcr_coefficients = movit::YCBCR_REC_601;
 723                         } else if (strcmp(interpretation_str, "rec709") == 0) {
 724                                 interpretation.ycbcr_coefficients_auto = false;
 725                                 interpretation.ycbcr_coefficients = movit::YCBCR_REC_709;
 726                         } else if (strcmp(interpretation_str, "auto") == 0) {
 727                                 interpretation.ycbcr_coefficients_auto = true;
 728                                 if (interpretation.full_range) {
 729                                         fprintf(stderr, "ERROR: Cannot use “auto” Y'CbCr coefficients with full range\n");
 730                                         exit(1);
 731                                 }
 732                         } else {
 733                                 fprintf(stderr, "ERROR: Invalid Y'CbCr coefficients '%s' (must be “rec601”, “rec709” or “auto”)\n", interpretation_str);
 734                                 exit(1);
 735                         }
 736                         global_flags.ycbcr_interpretation[card_num] = interpretation;
 737                         break;
 738                 }
 739                 case OPTION_FULLSCREEN:
 740                         global_flags.fullscreen = true;
 741                         break;
 742                 case OPTION_MJPEG_EXPORT_CARDS: {
 743                         if (card_to_mjpeg_stream_export_set) {
 744                                 fprintf(stderr, "ERROR: --mjpeg-export-cards given twice\n");
 745                                 exit(1);
 746                         }
 747                         global_flags.card_to_mjpeg_stream_export = parse_mjpeg_export_cards(optarg);
 748                         card_to_mjpeg_stream_export_set = true;
 749                         break;
 750                 }
 751                 case OPTION_HELP:
 752                         usage(program);
 753                         exit(0);
 754                 default:
 755                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 756                         fprintf(stderr, "\n");
 757                         usage(program);
 758                         exit(1);
 759                 }
 760         }
 761
 762         if (global_flags.x264_video_to_http +
 763             global_flags.av1_video_to_http > 1) {
 764                 fprintf(stderr, "ERROR: --http-{x264,av1}-video are mutually incompatible\n");
 765                 exit(1);
 766         }
 767         if (global_flags.bit_depth == 10) {
 768                 global_flags.x264_video_to_disk = true;  // No 10-bit Quick Sync support.
 769                 if (!global_flags.av1_video_to_http) {
 770                         global_flags.x264_video_to_http = true;
 771                 }
 772         }
 773         if (global_flags.x264_video_to_disk && !global_flags.av1_video_to_http) {
 774                 global_flags.x264_video_to_http = true;  // Quick Sync to HTTP but x264 to disk doesn't make sense.
 775         }
 776         if (global_flags.min_num_cards <= 0) {
 777                 fprintf(stderr, "ERROR: --num-cards must be at least 1\n");
 778                 exit(1);
 779         }
 780         if (global_flags.max_num_cards <= 0) {
 781                 fprintf(stderr, "ERROR: --max-num-cards must be at least 1\n");
 782                 exit(1);
 783         }
 784         if (global_flags.max_num_cards < global_flags.min_num_cards) {
 785                 fprintf(stderr, "ERROR: --max-num-cards can not be lower than --num-cards\n");
 786                 exit(1);
 787         }
 788         if (global_flags.output_card < -1 ||
 789             global_flags.output_card >= global_flags.max_num_cards) {
 790                 fprintf(stderr, "ERROR: --output-card points to a nonexistant card\n");
 791                 exit(1);
 792         }
 793         if (global_flags.enable_audio && !global_flags.transcode_audio && global_flags.stream_audio_codec_name.empty()) {
 794                 fprintf(stderr, "ERROR: If not transcoding audio, you must specify ahead-of-time what audio codec is in use\n");
 795                 fprintf(stderr, "       (using --http-audio-codec).\n");
 796                 exit(1);
 797         }
 798 #ifdef HAVE_CEF
 799         if (global_flags.enable_audio && global_flags.use_cef) {
 800                 fprintf(stderr, "ERROR: --cef does not currently support audio.\n");
 801                 exit(1);
 802         }
 803 #endif
 804         if (global_flags.x264_speedcontrol) {
 805                 if (!global_flags.x264_preset.empty() && global_flags.x264_preset != "faster") {
 806                         fprintf(stderr, "WARNING: --x264-preset is overridden by --x264-speedcontrol (implicitly uses \"faster\" as base preset)\n");
 807                 }
 808                 global_flags.x264_preset = "faster";
 809         } else if (global_flags.x264_preset.empty()) {
 810                 global_flags.x264_preset = X264_DEFAULT_PRESET;
 811         }
 812         if (global_flags.x264_separate_disk_preset.empty()) {
 813                 global_flags.x264_separate_disk_preset = X264_DEFAULT_PRESET;
 814         }
 815         if (!theme_dirs.empty()) {
 816                 global_flags.theme_dirs = theme_dirs;
 817         }
 818
 819         // In reality, we could probably do with any even value (we subsample
 820         // by two in some places), but it's better to be on the safe side
 821         // wrt. video codecs and such. (I'd set 16 if I could, but 1080 isn't
 822         // divisible by 16.)
 823         if (global_flags.width <= 0 || (global_flags.width % 8) != 0 ||
 824             global_flags.height <= 0 || (global_flags.height % 8) != 0) {
 825                 fprintf(stderr, "ERROR: --width and --height must be positive integers divisible by 8\n");
 826                 exit(1);
 827         }
 828
 829         for (pair<int, int> mapping : global_flags.default_stream_mapping) {
 830                 if (mapping.second >= global_flags.max_num_cards) {
 831                         fprintf(stderr, "ERROR: Signal %d mapped to card %d, which doesn't exist (try adjusting --max-num-cards)\n",
 832                                 mapping.first, mapping.second);
 833                         exit(1);
 834                 }
 835         }
 836
 837         // Rec. 709 would be the sane thing to do, but it seems many players
 838         // just default to BT.601 coefficients no matter what. We _do_ set
 839         // the right flags, so that a player that works properly doesn't have
 840         // to guess, but it's frequently ignored. See discussions
 841         // in e.g. https://trac.ffmpeg.org/ticket/4978; the situation with
 842         // browsers is complicated and depends on things like hardware acceleration
 843         // (https://bugs.chromium.org/p/chromium/issues/detail?id=333619 for
 844         // extensive discussion). VLC generally fixed this as part of 3.0.0
 845         // (see e.g. https://github.com/videolan/vlc/commit/bc71288b2e38c07d6921472824b92eef1aa85f7e
 846         // and https://github.com/videolan/vlc/commit/c3fc2683a9cde1d42674ebf9935dced05733a215),
 847         // but earlier versions were pretty random.
 848         //
 849         // On the other hand, HDMI/SDI output typically requires Rec. 709 for
 850         // HD resolutions (with no way of signaling anything else), which is
 851         // a conflicting demand. In this case, we typically let the HDMI/SDI
 852         // output win if it is active, but the user can override this.
 853         if (output_ycbcr_coefficients == "auto") {
 854                 // Essentially: BT.709 if HDMI/SDI output is on, otherwise BT.601.
 855                 global_flags.ycbcr_rec709_coefficients = false;
 856                 global_flags.ycbcr_auto_coefficients = true;
 857         } else if (output_ycbcr_coefficients == "rec709") {
 858                 global_flags.ycbcr_rec709_coefficients = true;
 859                 global_flags.ycbcr_auto_coefficients = false;
 860         } else if (output_ycbcr_coefficients == "rec601") {
 861                 global_flags.ycbcr_rec709_coefficients = false;
 862                 global_flags.ycbcr_auto_coefficients = false;
 863         } else {
 864                 fprintf(stderr, "ERROR: --output-ycbcr-coefficients must be “rec601”, “rec709” or “auto”\n");
 865                 exit(1);
 866         }
 867
 868         if (global_flags.output_buffer_frames < 0.0f) {
 869                 // Actually, even zero probably won't make sense; there is some internal
 870                 // delay to the card.
 871                 fprintf(stderr, "ERROR: --output-buffer-frames can't be negative.\n");
 872                 exit(1);
 873         }
 874         if (global_flags.output_slop_frames < 0.0f) {
 875                 fprintf(stderr, "ERROR: --output-slop-frames can't be negative.\n");
 876                 exit(1);
 877         }
 878         if (global_flags.max_input_queue_frames < 1) {
 879                 fprintf(stderr, "ERROR: --max-input-queue-frames must be at least 1.\n");
 880                 exit(1);
 881         }
 882         if (global_flags.max_input_queue_frames > 10) {
 883                 fprintf(stderr, "WARNING: --max-input-queue-frames has little effect over 10.\n");
 884         }
 885
 886         if (!isinf(global_flags.x264_crf)) {  // CRF mode is selected.
 887                 if (global_flags.x264_bitrate != -1) {
 888                         fprintf(stderr, "ERROR: --x264-bitrate and --x264-crf are mutually incompatible.\n");
 889                         exit(1);
 890                 }
 891         } else if (global_flags.x264_bitrate == -1) {
 892                 global_flags.x264_bitrate = DEFAULT_X264_OUTPUT_BIT_RATE;
 893         }
 894
 895         if (!isinf(global_flags.x264_separate_disk_crf)) {  // CRF mode is selected.
 896                 if (global_flags.x264_separate_disk_bitrate != -1) {
 897                         fprintf(stderr, "ERROR: --x264-separate-disk-bitrate and --x264-separate-disk-crf are mutually incompatible.\n");
 898                         exit(1);
 899                 }
 900         } else if (global_flags.x264_separate_disk_bitrate == -1) {
 901                 global_flags.x264_separate_disk_bitrate = DEFAULT_X264_OUTPUT_BIT_RATE;
 902         }
 903
 904         if (!card_to_mjpeg_stream_export_set) {
 905                 // Fill in the default mapping (export all cards, in order).
 906                 for (unsigned card_idx = 0; card_idx < unsigned(global_flags.max_num_cards); ++card_idx) {
 907                         global_flags.card_to_mjpeg_stream_export[card_idx] = card_idx;
 908                 }
 909         }
 910
 911         if (global_flags.srt_destination_host == "a.srt.youtube.com" && global_flags.srt_passphrase.empty()) {
 912                 fprintf(stderr, "ERROR: Cannot stream to YouTube without --srt-passphrase (get it from the YouTube streaming console)\n");
 913                 exit(1);
 914         }
 915 }