[FFmpeg-user] How to concatenate multiple mp4 files without re-encoding to an intermediate format

[Stefano Sabatini]

On date Friday 2012-08-31 13:37:13 +0300, Andrey Utkin encoded:
> AFAIR there's no straight way to do it by ffmpeg utility (but is
> possible by libavformat API), if concatenating demuxer is not invented
> yet.

Yes also read this:
http://ffmpeg.org/trac/ffmpeg/wiki/How%20to%20concatenate%20%28join%2C%20merge%29%20media%20files

Keep in mind that *physically* concatenating two media files won't
always result in a valid files, but only for a limited number of
formats (stream based formats). That's the same as concatenating two
PDFs files, you won't get a file which contains the two documents
"concatenated".

It would be a good idea to expose that information to the user, and
maybe we should make more clear the documentation (not that it matters
much, since most users usually don't read docs).

[...]
-- 
ffmpeg-user random tip #12
One minute of video noise with ffmpeg:
ffmpeg -t 60 -s qcif -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/urandom \
    -y noise.mpeg