[FFmpeg-user] joining avchd files

Nicolas George nicolas.george at normalesup.org
Mon Oct 29 20:36:30 CET 2012


L'octidi 8 brumaire, an CCXXI, sean darcy a écrit :
> If I play each separately this no audio sync problem,
> 
> The problem arises at most of the stitches, though not all. I think that
> just by pure luck some stitches happen at keyframes.
> 
> But what about using the concat profile and stripping out the audio and
> video separately. Can I then remux them (and how?)? Should that work? (I

The way of solving your problem goes through understanding it.

I suggest you examine carefully the packets and frames just before and just
after a stitch where the desync happens, using ffprobe, and see if the
timestamps match the progress of the video and the audio.

> realize I can try this myself, but I've an old machine, running 2gb
> files at  5 fps.)

Just use a faster codec, faster codec options and a smaller resolution. If
you need to gain still more time, skip some post-processing, such as the
loop filters. For tests, it does not matter if the quality is ugly or the
resulting file needlessly big.

Regards,

-- 
  Nicolas George
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