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Old 16th January 2021, 15:18   #7966  |  Link
FranceBB
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Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,883
Chroma bleeding is actually really weird, it shouldn't really happen and I think I know why it's happening to you!
Your input is an AVS Script from what I see, which handles 4:2:0 Type 1 but not 4:2:0 Type2!
So, the chroma location is wrong, hence the "bleeding".

Can you try with:

Code:
ffmpeg.exe -i "AVS Script.avs" -vf scale=out_color_matrix=bt2020nc:out_h_chr_pos=0:out_v_chr_pos=0 -pix_fmt yuv420p16le -strict -1 -an -f yuv4mpegpipe - | x265.exe --y4m - --dither
followed by the rest of your x265 command line? This should solve the chroma bleeding problem.
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