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FFmpeg Filtergraph to generate Blur Out
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| ffmpeg -i source.mp4 -filter_complex \ | |
| "[0:v]split=2[base][blurred]; \ | |
| [blurred]boxblur=luma_radius=50:chroma_radius=25:luma_power=1[blurred]; \ | |
| [blurred]fade=type=in:start_time=5:duration=1:alpha=1[blurred-with-fadein]; \ | |
| [base][blurred-with-fadein]overlay[blurout]" \ | |
| -map "[blurout]" blurout.mp4 |
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this is more a cross fade rather than blur in/out, the difference is quite visible when there are text/fonts or any sharp edges in the image where their edges will never blur, but instead fade out