Two mp4 video files can be joined using
ffmpeg with the concat filter. This filter
expects the argument to
-i to name a text file which will list the
files to be concatenated, like concat.txt
-f to identify the filter as concat and
-c to identify the
encoder for the video and audio as a copy (i.e., no re-encoding).
$ ffmpeg -f concat -i concat.txt -c copy joined.mp4
Other options include using mencoder.
$ mencoder -ovc copy -oac copy video1.avi video2.avi -o video.avi
To join multiple avi files into one big avi file we can utilise avimerge:
$ avimerge -i a1.avi a2.avi a3.avi -o a.avi
I have found this latter approach to get the audio of the second file out of sync!
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