[Ffmpeg-devel] mp3onmp4

Mike Melanson mike
Sun Nov 20 21:54:05 CET 2005

gauchi at gmx.net wrote:
>>>> And how do I envoke the latter? I have an MPEG-4 VIdeo mp3 audio  avi.
>>>> With copy I get 0x0055, but mplayer fails to play it.
>>>     Does QuickTime Player play it? That's the gold standard as far as QT
>>> media is concerned.
>>>     Also, please post the command line you are invoking.
>> ffmpeg -i in.avi -acodec copy -vcodec copy out.mp4
> I remember that I couldn't vcodec copy a an mpeg4 stream from one  
> container to another, I had to reencode it. Otherwide it didn't play  in 
> Quicktime then.
> Maybe this has changed by now.

	Doubtful. I wager the MPEG-4 "extradata" is not being properly retained 
between formats.

	-Mike Melanson

More information about the ffmpeg-devel mailing list