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ffmpeg expand aspect ratio with blur

ffmpeg -i input.mp4 -filter_complex "[0:v]boxblur=40,scale=1080x1920,setsar=1[bg];[0:v]scale=1080:1920:force_original_aspect_ratio=decrease[fg];[bg][fg]overlay=y=(H-h)/2" -c:a copy output.mp4

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ffmpeg expand aspect ratio with blur

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