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VSE: Fix video strip duration calculation 

The video duration was not read correctly from the video file.

It would use the global duration of the file which does in some cases
not line up with the actual duration of the video stream.
Now we take the video stream duration and start time into account when
calculating the strip duration.

Reviewed By: Richard Antalik

Differential Revision: http://developer.blender.org/D11920
This commit is contained in:
Sebastian Parborg 2021-07-12 16:00:43 +02:00
parent 43ad345caa
commit a01cf90fd8
1 changed files with 43 additions and 3 deletions
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46
source/blender/imbuf/intern/anim_movie.c
View File

@ -616,10 +616,50 @@ static int startffmpeg(struct anim *anim)
}
}
}
/* Fall back to the container. */
/* Fall back to manually estimating the video stream duration.
* This is because the video stream duration can be shorter than the pFormatCtx->duration.
*/
if (anim->duration_in_frames == 0) {
anim->duration_in_frames = (int)(pFormatCtx->duration * av_q2d(frame_rate) / AV_TIME_BASE +
0.5f);
double pts_time_base = av_q2d(video_stream->time_base);
double stream_dur;
if (video_stream->duration != AV_NOPTS_VALUE) {
stream_dur = video_stream->duration * pts_time_base;
}
else {
double video_start = 0;
double audio_start = 0;
if (video_stream->start_time != AV_NOPTS_VALUE) {
video_start = video_stream->start_time * pts_time_base;
}
/* Find audio stream to guess the duration of the video.
* Sometimes the audio AND the video stream have a start offset.
* The difference between these is the offset we want to use to
* calculate the video duration.
*/
for (i = 0; i < pFormatCtx->nb_streams; i++) {
if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
AVStream *audio_stream = pFormatCtx->streams[i];
if (audio_stream->start_time != AV_NOPTS_VALUE) {
audio_start = audio_stream->start_time * av_q2d(audio_stream->time_base);
}
break;
}
}
if (video_start > audio_start) {
stream_dur = (double)pFormatCtx->duration / AV_TIME_BASE - (video_start - audio_start);
}
else {
/* The video stream starts before or at the same time as the audio stream!
* We have to assume that the video stream is as long as the full pFormatCtx->duration.
*/
stream_dur = (double)pFormatCtx->duration / AV_TIME_BASE;
}
}
anim->duration_in_frames = (int)(stream_dur * av_q2d(frame_rate) + 0.5f);
}
frs_num = frame_rate.num;