How can I tile videos/create a video montage?

Question

I have four videos that I would like to tile in a 2x2 fashion to make a new video. Is there a way I can do this easily, preferably free and under Linux? I am willing to progra

Answer 1

The following ffmpeg command will do exactly what the questioner wanted:

ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -i input4.mp4 -filter_complex \
'[0:v]pad=iw*2:ih*2:0:0[int2];[int2][1:v]overlay=0:H/2[int3];[int3][2:v]overlay=W/2:0[int4];[int4][3:v]overlay=W/2:H/2[out]' \
-map [out] -c:v libx264 -crf 23 -preset veryfast output.mp4

First, the pad filter doubles the size of the first input video, leaving the original video in the top-left corner. The serial overlay filters then place the other inputs over the the black padding added by the pad filter.

If the videos are of different resolutions, the command will require some modification.