90.2 Video Concatenate or Join

20210725

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

file 'input1.mp4'
file 'input2.mp4'

Using -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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