[poisondeathray]

maybe there is a bug with full range ?

waveform/histograms only match if you use lossless (even compared to low crf like --crf 8, where you 'd only expect tiny differences) , regardless if you use vapoursynth input or ffmpeg scaling with rawvideo pipe

crf8 - waveform is compressed

ffmpeg -i "Color Range Test.MOV" -vf scale=iw:ih:in_range=pc:out_range=pc,format=yuv420p10le -f rawvideo - | x265_10bit.exe --fps 30000/1001 --input-res 1280x720 --input-depth 10 --output-depth 10 --input-csp i420 --crf 8.00 --range full --colormatrix smpte170m -o rawpipe_x265crf8.265 -

--lossless works with ffmpeg rawvideo pipe

ffmpeg -i "Color Range Test.MOV" -vf scale=iw:ih:in_range=pc:out_range=pc,format=yuv420p10le -f rawvideo - | x265_10bit.exe --fps 30000/1001 --input-res 1280x720 --input-depth 10 --output-depth 10 --input-csp i420 --lossless --range full --colormatrix smpte170m -o rawpipe_x265lossless.265 -

vspipe y4m --crf 8 waveform is compressed

vspipe --y4m 1.vpy - | x265_10bit.exe --y4m --crf 8.00 --colormatrix smpte170m --range full -o vs_x265.265 -

vspipe y4m --lossless waveform is ok

vspipe --y4m 1.vpy - | x265_10bit.exe --y4m --lossless --colormatrix smpte170m --range full -o vs_x265_lossless.265 -

vpy input

clip = core.lsmas.LibavSMASHSource(r'F:\Color Range Test.MOV')
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10)
clip.set_output()