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Fix MPEG opening preroll synchronization

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This commit is contained in:
gamer147
2026-08-11 16:39:30 -04:00
parent 650c10bc7a
commit d38e698b91
9 changed files with 128 additions and 55 deletions
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12
native/age_movie_ffmpeg/age_movie.c
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@@ -257,7 +257,12 @@ static int determine_duration(age_movie *movie, AVStream *stream, int64_t *out_d
}
static int rewind_for_decode(age_movie *movie, AVStream *stream) {
int64_t target = stream->start_time != AV_NOPTS_VALUE ? stream->start_time : 0;
/* MPEG video can contain decodable preroll before AVStream.start_time. DirectShow
presents those opening frames from graph time zero; seeking to the video pin's
later declared start skips them and advances picture relative to audio. */
int64_t target = av_rescale_q_rnd(movie->timeline_origin_ms,
(AVRational){1, 1000}, stream->time_base,
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
int result = av_seek_frame(movie->video_format, movie->video_stream_index, target, AVSEEK_FLAG_BACKWARD);
if (result < 0) {
movie->video_io_state.position = 0;
@@ -422,10 +427,7 @@ int32_t AGE_MOVIE_CALL age_movie_open(const uint8_t *bytes, size_t length,
movie->video_stream_index = result;
AVStream *stream = movie->video_format->streams[movie->video_stream_index];
movie->video_time_base = stream->time_base;
movie->video_fallback_origin_ms =
stream->start_time == AV_NOPTS_VALUE ? 0
: rescale_ms_down(stream->start_time, movie->video_time_base)
- movie->timeline_origin_ms;
movie->video_fallback_origin_ms = 0;
movie->video_codec = avcodec_alloc_context3(video_decoder);
if (movie->video_codec == NULL) {