New answers tagged conversion
Thanks for posting -v debug output. From that, I see the colormatrix filter doesn't support high-bit-depth inputs. There's an auto-inserted scale filter downsampling to yuv422p (which means 8bit), before it. You might as well compress the output with an 8-bit-per-component codec, if you need ffmpeg's colormatrix anyway, since ffmpeg already downsampled ...
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