X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fdashenc.c;h=1dd633365da61908466533460559620f3d4f0107;hb=26f02c51ce9797e392f956a268c373b353b21178;hp=83e0cff728f2aa4ef431e56c401872e85ee3fd12;hpb=e3851f6a3739e84094051d8b9c85732ab12c9fd9;p=ffmpeg diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c index 83e0cff728f..1dd633365da 100644 --- a/libavformat/dashenc.c +++ b/libavformat/dashenc.c @@ -45,6 +45,7 @@ #include "isom.h" #include "os_support.h" #include "url.h" +#include "vpcc.h" #include "dash.h" typedef struct Segment { @@ -76,15 +77,17 @@ typedef struct OutputStream { int nb_segments, segments_size, segment_index; Segment **segments; int64_t first_pts, start_pts, max_pts; - int64_t last_dts; + int64_t last_dts, last_pts; int bit_rate; - char bandwidth_str[64]; char codec_str[100]; int written_len; char filename[1024]; char full_path[1024]; char temp_path[1024]; + double availability_time_offset; + int total_pkt_size; + int muxer_overhead; } OutputStream; typedef struct DASHContext { @@ -94,7 +97,10 @@ typedef struct DASHContext { int nb_as; int window_size; int extra_window_size; +#if FF_API_DASH_MIN_SEG_DURATION int min_seg_duration; +#endif + int64_t seg_duration; int remove_at_exit; int use_template; int use_timeline; @@ -117,6 +123,8 @@ typedef struct DASHContext { AVIOContext *mpd_out; AVIOContext *m3u8_out; int streaming; + int64_t timeout; + int index_correction; } DASHContext; static struct codec_string { @@ -163,8 +171,23 @@ static void dashenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filenam } } +static void set_vp9_codec_str(AVFormatContext *s, AVCodecParameters *par, + AVRational *frame_rate, char *str, int size) { + VPCC vpcc; + int ret = ff_isom_get_vpcc_features(s, par, frame_rate, &vpcc); + if (ret == 0) { + av_strlcatf(str, size, "vp09.%02x.%02x.%02x", + vpcc.profile, vpcc.level, vpcc.bitdepth); + } else { + // Default to just vp9 in case of error while finding out profile or level + av_log(s, AV_LOG_WARNING, "Could not find VP9 profile and/or level\n"); + av_strlcpy(str, "vp9", size); + } + return; +} + static void set_codec_str(AVFormatContext *s, AVCodecParameters *par, - char *str, int size) + AVRational *frame_rate, char *str, int size) { const AVCodecTag *tags[2] = { NULL, NULL }; uint32_t tag; @@ -173,7 +196,11 @@ static void set_codec_str(AVFormatContext *s, AVCodecParameters *par, // common Webm codecs are not part of RFC 6381 for (i = 0; codecs[i].id; i++) if (codecs[i].id == par->codec_id) { - av_strlcpy(str, codecs[i].str, size); + if (codecs[i].id == AV_CODEC_ID_VP9) { + set_vp9_codec_str(s, par, frame_rate, str, size); + } else { + av_strlcpy(str, codecs[i].str, size); + } return; } @@ -269,6 +296,8 @@ static void set_http_options(AVDictionary **options, DASHContext *c) av_dict_set(options, "user_agent", c->user_agent, 0); if (c->http_persistent) av_dict_set_int(options, "multiple_requests", 1, 0); + if (c->timeout >= 0) + av_dict_set_int(options, "timeout", c->timeout, 0); } static void get_hls_playlist_name(char *playlist_name, int string_size, @@ -340,8 +369,12 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatCont if (c->use_template) { int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE; avio_printf(out, "\t\t\t\tuse_timeline) - avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration); + if (!c->use_timeline) { + avio_printf(out, "duration=\"%"PRId64"\" ", c->seg_duration); + if (c->streaming && os->availability_time_offset) + avio_printf(out, "availabilityTimeOffset=\"%.3f\" ", + os->availability_time_offset); + } avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1); if (c->use_timeline) { int64_t cur_time = 0; @@ -536,20 +569,25 @@ static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_ind for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; + char bandwidth_str[64] = {'\0'}; if (os->as_idx - 1 != as_index) continue; + if (os->bit_rate > 0) + snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"", + os->bit_rate + os->muxer_overhead); + if (as->media_type == AVMEDIA_TYPE_VIDEO) { AVStream *st = s->streams[i]; avio_printf(out, "\t\t\tformat_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height); + i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height); if (st->avg_frame_rate.num) avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den); avio_printf(out, ">\n"); } else { avio_printf(out, "\t\t\t\n", - i, os->format_name, os->codec_str, os->bandwidth_str, s->streams[i]->codecpar->sample_rate); + i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->sample_rate); avio_printf(out, "\t\t\t\t\n", s->streams[i]->codecpar->channels); } @@ -737,9 +775,6 @@ static int write_manifest(AVFormatContext *s, int final) update_period = 500; avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period); avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE); - if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) { - format_date_now(c->availability_start_time, sizeof(c->availability_start_time)); - } if (c->availability_start_time[0]) avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time); format_date_now(now_str, sizeof(now_str)); @@ -812,25 +847,28 @@ static int write_manifest(AVFormatContext *s, int final) } av_dict_free(&opts); - ff_hls_write_playlist_version(out, 6); + ff_hls_write_playlist_version(out, 7); for (i = 0; i < s->nb_streams; i++) { char playlist_file[64]; AVStream *st = s->streams[i]; + OutputStream *os = &c->streams[i]; if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) continue; get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i); ff_hls_write_audio_rendition(out, (char *)audio_group, playlist_file, i, is_default); - max_audio_bitrate = FFMAX(st->codecpar->bit_rate, max_audio_bitrate); + max_audio_bitrate = FFMAX(st->codecpar->bit_rate + + os->muxer_overhead, max_audio_bitrate); is_default = 0; } for (i = 0; i < s->nb_streams; i++) { char playlist_file[64]; AVStream *st = s->streams[i]; + OutputStream *os = &c->streams[i]; char *agroup = NULL; - int stream_bitrate = st->codecpar->bit_rate; + int stream_bitrate = st->codecpar->bit_rate + os->muxer_overhead; if ((st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) && max_audio_bitrate) { agroup = (char *)audio_group; stream_bitrate += max_audio_bitrate; @@ -868,6 +906,13 @@ static int dash_init(AVFormatContext *s) if (c->single_file) c->use_template = 0; +#if FF_API_DASH_MIN_SEG_DURATION + if (c->min_seg_duration != 5000000) { + av_log(s, AV_LOG_WARNING, "The min_seg_duration option is deprecated and will be removed. Please use the -seg_duration\n"); + c->seg_duration = c->min_seg_duration; + } +#endif + av_strlcpy(c->dirname, s->url, sizeof(c->dirname)); ptr = strrchr(c->dirname, '/'); if (ptr) { @@ -898,10 +943,7 @@ static int dash_init(AVFormatContext *s) char filename[1024]; os->bit_rate = s->streams[i]->codecpar->bit_rate; - if (os->bit_rate) { - snprintf(os->bandwidth_str, sizeof(os->bandwidth_str), - " bandwidth=\"%d\"", os->bit_rate); - } else { + if (!os->bit_rate) { int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ? AV_LOG_ERROR : AV_LOG_WARNING; av_log(s, level, "No bit rate set for stream %d\n", i); @@ -917,14 +959,23 @@ static int dash_init(AVFormatContext *s) if (!ctx) return AVERROR(ENOMEM); - // choose muxer based on codec: webm for VP8/9 and opus, mp4 otherwise + // choose muxer based on codec: webm for VP8 and opus, mp4 otherwise // note: os->format_name is also used as part of the mimetype of the // representation, e.g. video/ if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP8 || - s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VP9 || s->streams[i]->codecpar->codec_id == AV_CODEC_ID_OPUS || s->streams[i]->codecpar->codec_id == AV_CODEC_ID_VORBIS) { snprintf(os->format_name, sizeof(os->format_name), "webm"); + + if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { + av_log(s, AV_LOG_ERROR, + "WebM support in dashenc is experimental and has not " + "been validated. For testing purposes, make sure " + "to add -strict experimental and override " + "-init_seg_name and -media_seg_name to end with " + "the extension 'webm'.\n"); + return AVERROR(EINVAL); + } } else { snprintf(os->format_name, sizeof(os->format_name), "mp4"); } @@ -932,10 +983,11 @@ static int dash_init(AVFormatContext *s) if (!ctx->oformat) return AVERROR_MUXER_NOT_FOUND; os->ctx = ctx; - ctx->interrupt_callback = s->interrupt_callback; - ctx->opaque = s->opaque; - ctx->io_close = s->io_close; - ctx->io_open = s->io_open; + ctx->interrupt_callback = s->interrupt_callback; + ctx->opaque = s->opaque; + ctx->io_close = s->io_close; + ctx->io_open = s->io_open; + ctx->strict_std_compliance = s->strict_std_compliance; if (!(st = avformat_new_stream(ctx, NULL))) return AVERROR(ENOMEM); @@ -971,7 +1023,7 @@ static int dash_init(AVFormatContext *s) else av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0); } else { - av_dict_set_int(&opts, "cluster_time_limit", c->min_seg_duration / 1000, 0); + av_dict_set_int(&opts, "cluster_time_limit", c->seg_duration / 1000, 0); av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit av_dict_set_int(&opts, "dash", 1, 0); av_dict_set_int(&opts, "dash_track_number", i + 1, 0); @@ -985,13 +1037,6 @@ static int dash_init(AVFormatContext *s) av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename); - // Flush init segment - // except for mp4, since delay_moov is set and the init segment - // is then flushed after the first packets - if (strcmp(os->format_name, "mp4")) { - flush_init_segment(s, os); - } - s->streams[i]->time_base = st->time_base; // If the muxer wants to shift timestamps, request to have them shifted // already before being handed to this muxer, so we don't have mismatches @@ -1010,15 +1055,16 @@ static int dash_init(AVFormatContext *s) c->has_video = 1; } - set_codec_str(s, st->codecpar, os->codec_str, sizeof(os->codec_str)); + set_codec_str(s, st->codecpar, &st->avg_frame_rate, os->codec_str, + sizeof(os->codec_str)); os->first_pts = AV_NOPTS_VALUE; os->max_pts = AV_NOPTS_VALUE; os->last_dts = AV_NOPTS_VALUE; os->segment_index = 1; } - if (!c->has_video && c->min_seg_duration <= 0) { - av_log(s, AV_LOG_WARNING, "no video stream and no min seg duration set\n"); + if (!c->has_video && c->seg_duration <= 0) { + av_log(s, AV_LOG_WARNING, "no video stream and no seg duration set\n"); return AVERROR(EINVAL); } return 0; @@ -1030,21 +1076,23 @@ static int dash_write_header(AVFormatContext *s) int i, ret; for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; - if ((ret = avformat_write_header(os->ctx, NULL)) < 0) { - dash_free(s); + if ((ret = avformat_write_header(os->ctx, NULL)) < 0) + return ret; + + // Flush init segment + // Only for WebM segment, since for mp4 delay_moov is set and + // the init segment is thus flushed after the first packets. + if (strcmp(os->format_name, "mp4") && + (ret = flush_init_segment(s, os)) < 0) return ret; - } } - ret = write_manifest(s, 0); - if (!ret) - av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->url); return ret; } static int add_segment(OutputStream *os, const char *file, int64_t time, int duration, int64_t start_pos, int64_t range_length, - int64_t index_length) + int64_t index_length, int next_exp_index) { int err; Segment *seg; @@ -1072,6 +1120,12 @@ static int add_segment(OutputStream *os, const char *file, seg->index_length = index_length; os->segments[os->nb_segments++] = seg; os->segment_index++; + //correcting the segment index if it has fallen behind the expected value + if (os->segment_index < next_exp_index) { + av_log(NULL, AV_LOG_WARNING, "Correcting the segment index after file %s: current=%d corrected=%d\n", + file, os->segment_index, next_exp_index); + os->segment_index = next_exp_index; + } return 0; } @@ -1109,7 +1163,8 @@ static void find_index_range(AVFormatContext *s, const char *full_path, } static int update_stream_extradata(AVFormatContext *s, OutputStream *os, - AVCodecParameters *par) + AVCodecParameters *par, + AVRational *frame_rate) { uint8_t *extradata; @@ -1126,11 +1181,33 @@ static int update_stream_extradata(AVFormatContext *s, OutputStream *os, os->ctx->streams[0]->codecpar->extradata = extradata; os->ctx->streams[0]->codecpar->extradata_size = par->extradata_size; - set_codec_str(s, par, os->codec_str, sizeof(os->codec_str)); + set_codec_str(s, par, frame_rate, os->codec_str, sizeof(os->codec_str)); return 0; } +static void dashenc_delete_file(AVFormatContext *s, char *filename) { + DASHContext *c = s->priv_data; + int http_base_proto = ff_is_http_proto(filename); + + if (http_base_proto) { + AVIOContext *out = NULL; + AVDictionary *http_opts = NULL; + + set_http_options(&http_opts, c); + av_dict_set(&http_opts, "method", "DELETE", 0); + + if (dashenc_io_open(s, &out, filename, &http_opts) < 0) { + av_log(s, AV_LOG_ERROR, "failed to delete %s\n", filename); + } + + av_dict_free(&http_opts); + dashenc_io_close(s, &out, filename); + } else if (unlink(filename) < 0) { + av_log(s, AV_LOG_ERROR, "failed to delete %s: %s\n", filename, strerror(errno)); + } +} + static int dash_flush(AVFormatContext *s, int final, int stream) { DASHContext *c = s->priv_data; @@ -1139,10 +1216,22 @@ static int dash_flush(AVFormatContext *s, int final, int stream) const char *proto = avio_find_protocol_name(s->url); int use_rename = proto && !strcmp(proto, "file"); - int cur_flush_segment_index = 0; - if (stream >= 0) + int cur_flush_segment_index = 0, next_exp_index = -1; + if (stream >= 0) { cur_flush_segment_index = c->streams[stream].segment_index; + //finding the next segment's expected index, based on the current pts value + if (c->use_template && !c->use_timeline && c->index_correction && + c->streams[stream].last_pts != AV_NOPTS_VALUE && + c->streams[stream].first_pts != AV_NOPTS_VALUE) { + int64_t pts_diff = av_rescale_q(c->streams[stream].last_pts - + c->streams[stream].first_pts, + s->streams[stream]->time_base, + AV_TIME_BASE_Q); + next_exp_index = (pts_diff / c->seg_duration) + 1; + } + } + for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; AVStream *st = s->streams[i]; @@ -1187,18 +1276,22 @@ static int dash_flush(AVFormatContext *s, int final, int stream) } } + if (!os->muxer_overhead) + os->muxer_overhead = ((int64_t) (range_length - os->total_pkt_size) * + 8 * AV_TIME_BASE) / + av_rescale_q(os->max_pts - os->start_pts, + st->time_base, AV_TIME_BASE_Q); + os->total_pkt_size = 0; + if (!os->bit_rate) { // calculate average bitrate of first segment int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / av_rescale_q(os->max_pts - os->start_pts, st->time_base, AV_TIME_BASE_Q); - if (bitrate >= 0) { + if (bitrate >= 0) os->bit_rate = bitrate; - snprintf(os->bandwidth_str, sizeof(os->bandwidth_str), - " bandwidth=\"%d\"", os->bit_rate); - } } - add_segment(os, os->filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length); + add_segment(os, os->filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length, next_exp_index); av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, os->full_path); os->pos += range_length; @@ -1215,7 +1308,7 @@ static int dash_flush(AVFormatContext *s, int final, int stream) for (j = 0; j < remove; j++) { char filename[1024]; snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file); - unlink(filename); + dashenc_delete_file(s, filename); av_free(os->segments[j]); } os->nb_segments -= remove; @@ -1234,9 +1327,10 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt) DASHContext *c = s->priv_data; AVStream *st = s->streams[pkt->stream_index]; OutputStream *os = &c->streams[pkt->stream_index]; + int64_t seg_end_duration, elapsed_duration; int ret; - ret = update_stream_extradata(s, os, st->codecpar); + ret = update_stream_extradata(s, os, st->codecpar, &st->avg_frame_rate); if (ret < 0) return ret; @@ -1260,11 +1354,31 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt) if (os->first_pts == AV_NOPTS_VALUE) os->first_pts = pkt->pts; + os->last_pts = pkt->pts; + + if (!c->availability_start_time[0]) + format_date_now(c->availability_start_time, + sizeof(c->availability_start_time)); + + if (!os->availability_time_offset && pkt->duration) { + int64_t frame_duration = av_rescale_q(pkt->duration, st->time_base, + AV_TIME_BASE_Q); + os->availability_time_offset = ((double) c->seg_duration - + frame_duration) / AV_TIME_BASE; + } + + if (c->use_template && !c->use_timeline) { + elapsed_duration = pkt->pts - os->first_pts; + seg_end_duration = (int64_t) os->segment_index * c->seg_duration; + } else { + elapsed_duration = pkt->pts - os->start_pts; + seg_end_duration = c->seg_duration; + } if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) && pkt->flags & AV_PKT_FLAG_KEY && os->packets_written && - av_compare_ts(pkt->pts - os->start_pts, st->time_base, - c->min_seg_duration, AV_TIME_BASE_Q) >= 0) { + av_compare_ts(elapsed_duration, st->time_base, + seg_end_duration, AV_TIME_BASE_Q) >= 0) { int64_t prev_duration = c->last_duration; c->last_duration = av_rescale_q(pkt->pts - os->start_pts, @@ -1301,6 +1415,7 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt) else os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration); os->packets_written++; + os->total_pkt_size += pkt->size; if ((ret = ff_write_chained(os->ctx, 0, pkt, s, 0)) < 0) return ret; @@ -1308,7 +1423,7 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt) flush_init_segment(s, os); //open the output context when the first frame of a segment is ready - if (!c->single_file && !os->out) { + if (!c->single_file && os->packets_written == 1) { AVDictionary *opts = NULL; const char *proto = avio_find_protocol_name(s->url); int use_rename = proto && !strcmp(proto, "file"); @@ -1367,9 +1482,9 @@ static int dash_write_trailer(AVFormatContext *s) for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile); - unlink(filename); + dashenc_delete_file(s, filename); } - unlink(s->url); + dashenc_delete_file(s, s->url); } return 0; @@ -1404,7 +1519,10 @@ static const AVOption options[] = { { "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E }, { "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E }, - { "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E }, +#if FF_API_DASH_MIN_SEG_DURATION + { "min_seg_duration", "minimum segment duration (in microseconds) (will be deprecated)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, E }, +#endif + { "seg_duration", "segment duration (in seconds, fractional value can be set)", OFFSET(seg_duration), AV_OPT_TYPE_DURATION, { .i64 = 5000000 }, 0, INT_MAX, E }, { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E }, { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E }, { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E }, @@ -1418,6 +1536,8 @@ static const AVOption options[] = { { "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E }, { "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E }, { "streaming", "Enable/Disable streaming mode of output. Each frame will be moof fragment", OFFSET(streaming), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E }, + { "timeout", "set timeout for socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT_MAX, .flags = E }, + { "index_correction", "Enable/Disable segment index correction logic", OFFSET(index_correction), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E }, { NULL }, };