When converting from 10bit to 8bit with the following script...
Code:
LWLibavVideoSource("bla.mkv", stacked=true, format="YUV420P10")
ConvertFromStacked(bits=10)
ConvertBits(bits=8, dither=0)
... the luma range goes from looking like this...
to looking like this...
Have I overlooked something? When previewing in VirtualDub2, the video doesn't look obviously wrong, but I've never seen a histogram look like that unless there's a problem of some kind.