How to blur side of horizontal video with ffmpeg

Question

I would like to find a way to blur the top and the bottom of an horizontal video with the same video.

At the moment I have the code to do the opposite:

ffmpeg -i test.mp4 -lavfi "[0:v]scale=1920*2:1080*2,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[bg];[0:v]scale=-1:1080[ov];[bg][ov]overlay=(W-w)/2:(H-h)/2,crop=w=1920:h=1080" outpt.mp4

So I have this: 1 And I would like to have this: 2

Answer 1

I found this, but the video is not center and I think it's not the good resolution because the video on the side is bigger than the other video.

ffmpeg -i test.mp4 -lavfi "[0:v]scale=1080*2:1920*2,boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=1[bg];[0:v]scale=1080:-1[ov];[bg][ov]overlay=0:(H-h)/2,crop=w=1080:h=1920,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" -s 1080x1920 outpt.mp4

Finally, I get that: what I have