green video on ffv1 in mkv at RGB 10 bit (gbrp10le, gbrp10be)
This pixel format is used to losslessly compressed 10 RGB video which is generated by film scanners.
Samples can be generated via:
ffmpeg -f lavfi -i testsrc -t 1 -c:v ffv1 -level 3 -g 1 -pix_fmt gbrp10le gbrp10le_ffv1.mkv
ffmpeg -f lavfi -i testsrc -t 1 -c:v ffv1 -level 3 -g 1 -pix_fmt gbrp10be gbrp10be_ffv1.mkv