Apply Multiple Blur Areas To A Video With ffmpeg

September 2023

This is a command that applies three different blur boxes to a video

CMD="[0:v]copy[base];";

CMD="$CMD[0:v]crop=94:23:0:0,boxblur=4[tmp];"
CMD="$CMD[base][tmp]overlay=113:4[base];"

CMD="$CMD[0:v]crop=72:52:6:47,boxblur=4[tmp];"
CMD="$CMD[base][tmp]overlay=6:47[base];"

CMD="$CMD[0:v]crop=130:18:77:48,boxblur=4[tmp];"
CMD="$CMD[base][tmp]overlay=77:48[base];"

ffmpeg -i "in.mp4" \
-filter_complex "$CMD" \
-map "[base]" \
-y out.mp4

Notes

The blurbox will break if the cropbox is too close to the edge
The idea here is that you could add as many blurs as you'd like via a script or whatnot via a loop

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