[FFmpeg-user] merging mp4 (h.264) and aac with acodec copy doesn't work

Marc ffmpeg at schmaili.com
Wed Jul 4 19:03:24 CEST 2012

Meanwhile I found a "workaround". It's makable with MP4box. So obvioulsy 
there cannot be kind of a technical impossibility (header construction 
or kind of that) to merge this two formats together. But I am still 
interested in this point because I have great experiences with ffmpeg.

Best regards

Am 04.07.2012 18:41, schrieb Marc:
> Hello!
> I have a mp4 video clip (h.264) and a aac audio clip and try to merge 
> them together with
>   ffmpeg  "'.$videotrack.'" -i "'.$audiotrack2.'" -vcodec copy -acodec 
> copy "'.$targetFile.'"
> but it doesn't work. Only a very small target file is created  (28 kb 
> instead of about 16 mb) which is corrupt. It only works if I replace 
> the copy parameter with the aac audio codec. But I need this for a 
> very time critical project so I do not want to reencode it because 
> this takes too much time. Is it impossible to merge together a mp4 
> (h.264) video track and a aac audio track together with the copy 
> parameter? If so, is there a workaround for it?
> Best regards
> Marc
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