[FFmpeg-user] Plays too fast on iPod?

Christian Ebert blacktrash at gmx.net
Mon Nov 28 16:30:29 CET 2011

* . on Monday, November 28, 2011 at 09:57:25 -0500
> I put a video named 'dotdmeta.mp4' onto my iPod 160 G (Classic).  Below
> is the FFMPEG -i information.
> The video plays fine until about the 17 minute mark and then playback
> speeds up to twice its normal speed.  Once the video speeds up the audio
> is out of sync with the video too.
> However, if I convert the video using the following FFMPEG code line the
> playback on the iPod is fine (but the conversion takes a long, long time).
> ffmpeg -i dotdmeta.mp4 -vcodec libx264 -preset medium -vpre ipod640 -crf
> 24 -acodec libfaac -aq 100  -vf scale="640:trunc(ow/a/2)*2" DOD.mp4
> Any idea how to easily fix it?

For ipod classic you need -vpre ipod320

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