Le duodi 22 vendémiaire, an CCXXV, Sven C. Dack a écrit : > If I'm not mistaken then yuv444p is linked to 10-bit depth encoding
Not necessarily. yuv444 is opposed to yuv420: with 420, pixels are grouped as 2×2 squares, where all four pixels have their brightness ("y" = "luminance") encoded, while the color ("u"/"v" = "chrominance") is the same for all four; with 444, pixels have all three components coded individually. That means that in 444, each pixels use three components, while in 420 they only use 1.5 on average, half as much. This makes sense because the eye is more sensitive to brightness changes than color changes. 10-bits depth is opposed to 8-bits depth, it measures the accuracy for each component. All four combinations are possible: yuv420p8, yuv420p10, yuv444p8, yuv444p10. The 8 is usually not printed because it was for a long time the only possible choice and is still the default. Of course, because of compatibility problems, once you decide to ditch yuv420p8, you might as well go all the way to yuv444p10, therefore the two intermediate ones are more rarely seen. But yuv444p8 makes sense for screencasts, to avoid color bleeding. The p means that libavcodec stores the three components in three separate memory areas rather than interleaved all together like rgb24. Regards, -- Nicolas George
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