feedback filter bug

[张文兵]

Summary of the bug:
10bit video using 'feedback' appears with a green color block
How to reproduce:

% ffmpeg -i test.mov -vf "[in][blurin]feedback=x=1005:y=2:w=656:h=507[out][blurout];[blurout]gblur=8[blurin]"  test.mp4

[Michael Koch]

Please show the full console output. I can't reproduce the issue with testsrc2 as input:

ffmpeg -f lavfi -i testsrc2,format=yuv422p10le -vf "[in][blurin]feedback=x=100:y=10:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]" -t 10 -y test.mp4

[张文兵]

Replying to Michael Koch:

Please show the full console output. I can't reproduce the issue with testsrc2 as input:

ffmpeg -f lavfi -i testsrc2,format=yuv422p10le -vf "[in][blurin]feedback=x=100:y=10:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]" -t 10 -y test.mp4

ffmpeg -f lavfi -i testsrc2,format=yuv422p10le,scale=1920:1080 -vf "[in][blurin]feedback=x=1005:y=2:w=656:h=507[out][blurout];[blurout]gblur=8[blurin]" -t 10 -y test.mp4

[张文兵]

Replying to 张文兵:

Replying to Michael Koch:

Please show the full console output. I can't reproduce the issue with testsrc2 as input:

ffmpeg -f lavfi -i testsrc2,format=yuv422p10le -vf "[in][blurin]feedback=x=100:y=10:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]" -t 10 -y test.mp4

ffmpeg -f lavfi -i testsrc2,format=yuv422p10le,scale=1920:1080 -vf "[in][blurin]feedback=x=1005:y=2:w=656:h=507[out][blurout];[blurout]gblur=8[blurin]" -t 10 -y test.mp4

Need this specific x and y

[Michael Koch]

I see, it's reproducible only if x and h are odd numbers. As a workaround it works with x=1006 and h=508.

[张文兵]

Replying to Michael Koch:

I see, it's reproducible only if x and h are odd numbers. As a workaround it works with x=1006 and h=508.

Yes, there is no problem installing the method you provided

[Michael Koch]

The issue is only reproducible with 10-bit video if x is odd. No problem if y, w or h are odd. Also no problem with 8-bit video.

[Elon Musk]

See 90096dd04216b1bb398525631206172f07e382ca