Combining 2 MP4 movies in to a split view movie

May 8, 2017 - Reading time: ~1 minute

I installed a set of cameras on my bike and the streams are saved separately on the SD card. There is some kind of Windows tool included but I wanted to combine them on Linux, since I don't use Windows at home.

This ffmpeg command will take 2 streams and put them together side to side in a new MP4 file. Make sure both streams have the same resolution!

ffmpeg \
 -i CAM1.MP4 \
 -i CAM2.MP4 \
 -filter_complex '[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' \
 -map [vid] \
 -c:v libx264 \
 -crf 23 \
 -preset veryfast \
 split-view.MP4