ConvertBits(8,dither=1)
doesn't seem to work for 8-bit sources.
Wiki says:
"Dithering is allowed only for 10-16bit (not 32bit float) sources."
You can dither from 16bits to 16bits so why not from 8bits to 8bits? I'm assuming those will just pass through the video untouched anyway. Life gets easier when I can just slap on a convert to 8bits at the end without worrying about what the input bitdepth is.
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