On 11/06/14 18:56, Gonzalo Garramuno wrote:
I have written a viewer that allows writing h264 video with libx264.
However the audio (mp3, ac3 or aac) comes out of sync with the video.
The problem seems to be the first 20 frames or so that are not written
out to the file.
I can reproduce the problem with the muxing.c example from the docs
when I modify it like the attached diff.
In that case, I cannot tell that it starts early but the sound ends 20
frames before the end of the movie.
Can someone suggest something to try?
Okay. The problem is that video_time is calculated from
AVStream->pts.val and that does not get updated in each frame with
h264. I switched to picture->pts for my timing calculations and all is
good.
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