Using ffmpeg to combine videos side by side
note, November 04, 2023 on Mitja Felicijan's blog
I had a 4 webm videos (each 492x451) that I wanted to combine to be played side
by side and I tried iMovie and
Kdenlive and failed to do it in an easy way. I needed
this for Github readme file so it also needed to be a GIF.
The following is the ffmpeg version of it.
ffmpeg -y \
-i 01.webm \
-i 02.webm \
-i 03.webm \
-i 04.webm \
-filter_complex "\
[0:v] trim=duration=8, setpts=PTS-STARTPTS, scale=492x451, fps=6 [a0]; \
[1:v] trim=duration=8, setpts=PTS-STARTPTS, scale=492x451, fps=6 [a1]; \
[2:v] trim=duration=8, setpts=PTS-STARTPTS, scale=492x451, fps=6 [a2]; \
[3:v] trim=duration=8, setpts=PTS-STARTPTS, scale=492x451, fps=6 [a3]; \
[a0][a1][a2][a3] xstack=inputs=4:layout=0_0|w0_0|w0+w1_0|w0+w1+w2_0, scale=1000:-1 [v]" \
-map "[v]" \
-crf 23 \
-preset veryfast \
trigraphs.gif
- This will produce
trigraphs.gif that is also scaled to max 1000px in width
(refer to scale=1000:-1).
- The important part for 4x1 stack is
xstack=inputs=4:layout=0_0|w0_0|w0+w1_0|w0+w1+w2_0.
- This will also cap frame rate to 6 (refer to
fps=6) since that is enough and
this makes playback of GIFs smoother in a browser.
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