Marwan Daar wrote:
On 11/11/2015 11:52 AM, Andy Furniss wrote:
Just because you are using 10bit the result of playing will still
be 8 bit as that's what most computer screens are.
This doesn't mean that 10 bit yuv is pointless as X bit rgb -> 8
bit yuv and back looses loads of colours, so 10 bit yuv is better
even if your source is only 8 bit rgb.
Agreed. For my purposes, I'm investigating whether the GPU is
dithering, and if so, how exactly it's achieving this. Part of the
process involves taking luminance measurements of different test
patterns. Being able to encode these patterns into a movie file, so I
can step through frame by frame, is critical for reducing the amount
of noise in my measurements.
Ahh sounds complicated. When you say "taking luminance measurements" do
you mean externally - maybe you have some nice panel - I think mine
probably dithers 8 -> 6 bits whatever the GPU does.
On linux if you have some OLED with deep color and a radeon GPU you may
even be able to use it over HDMI - though it's disabled by default with
a module param as it only works with some cards, plus you need something
like Psychtoolbox-3.
I built 10 bit x264/ffmpeg and tested again via mp4 as below and saw the
same result = 1.png and out.png were just 1 different.
ffmpeg -i 1.png -vf scale=in_range=full:out_range=full -vcodec libx264
1-yuv444p10le-full.mp4
ffmpeg -i 1-yuv444p10le-full.mp4 -vf scale=in_range=full:out_range=full
out.png
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