Streams with all zero sample_delta in 'stts' have all zero dts. They have higher chance be chose by mov_find_next_sample(), which leads to seek again and again. For example, GoPro created a 'GoPro SOS' stream: Stream #0:4[0x5](eng): Data: none (fdsc / 0x63736466), 13 kb/s (default) Metadata: creation_time : 2022-06-21T08:49:19.000000Z handler_name : GoPro SOS With 'ffprobe -show_frames http://example.com/gopro.mp4', ffprobe blocks until all samples in 'GoPro SOS' stream are consumed first.
Unified · Split
| @@ -3062,6 +3062,21 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom) · 3061 unmodified lines | |||
| 3062 | st->nb_frames= total_sample_count; | 3062 | st->nb_frames= total_sample_count; |
| 3063 | if (duration) | 3063 | if (duration) |
| 3064 | st->duration= FFMIN(st->duration, duration); | 3064 | st->duration= FFMIN(st->duration, duration); |
| 3065 | |||
| 3066 | // All samples have zero duration. They have higher chance be chose by | ||
| 3067 | // mov_find_next_sample, which leads to seek again and again. | ||
| 3068 | // | ||
| 3069 | // It's AVERROR_INVALIDDATA actually, but such files exist in the wild. | ||
| 3070 | // So only mark data stream as discarded for safety. | ||
| 3071 | if (!duration && sc->stts_count && | ||
| 3072 | st->codecpar->codec_type == AVMEDIA_TYPE_DATA) { | ||
| 3073 | av_log(c->fc, AV_LOG_WARNING, | ||
| 3074 | "All samples in data stream index:id [%d:%d] have zero " | ||
| 3075 | "duration, stream set to be discarded by default. Override " | ||
| 3076 | "using AVStream->discard or -discard for ffmpeg command.\n", | ||
| 3077 | st->index, st->id); | ||
| 3078 | st->discard = AVDISCARD_ALL; | ||
| 3079 | } | ||
| 3065 | sc->track_end = duration; | 3080 | sc->track_end = duration; |
| 3066 | return 0; | 3081 | return 0; |
| 3067 | } | 3082 | } |