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