How to join two movies side by side

by Kyle Ellefsen on February 01, 2017

This code allows you to stitch together two movies side by side using ffmpeg. This should be done in the command line in the directory where two movies, left.mp4 and right.mp4, are located. Changing the scale and size changes the resolution. Documentation.

ffmpeg -i left.mp4 -i right.mp4 -filter_complex "
nullsrc=size=2000x1000 [background];
[0:v] setpts=PTS-STARTPTS, scale=1000x1000 [left];
[1:v] setpts=PTS-STARTPTS, scale=1000x1000 [right];
[background][left]       overlay=shortest=1       [background+left];
[background+left][right] overlay=shortest=1:x=1000 [left+right]
" -map "[left+right]"  output.mp4