[FFmpeg-user] Problem editing m4a files with ffmpeg
richard at richsim900.plus.com
Fri May 20 15:43:41 CEST 2011
When I edit an m4a file using ffmpeg using command like this:
ffmpeg -i filename.m4a -ss 00:02:34 -t 00:28:35 -acodec copy
the edited file will play OK on software media players, but large m4a
files won't play on my Marantz CD6003. The files timeout after 30
If I use mp4creator to optimize the edited m4a file using command like
mp4creator -optimize filename.m4a
the optimized file plays OK on the Marantz.
I found out using AtomicParsley that editing an m4a file with ffmpeg
moves the mdat atoms from the end of the file to near the front. This
seems to be an issue for the Marantz. mp4creator moves the mdat atoms
back to the end of the file again.
Is this a bug in ffmpeg?
You kindly fixed another issue with the Marantz here:-
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