@MasterNobody
Your code doesn't work at all...
Code:
g:\Enctools> echo ColorBars^(^).Trim^(0,999^) > ./in.avs
g:\Enctools> .\avs2yuv_ch.exe .\in.avs -o .\out1.y4m
.\in.avs: 640x480, 30000/1001 fps, 1000 frames
converting RGB -> YV12
g:\Enctools> .\avs2yuv_bm.exe .\in.avs -o .\out2.y4m
(null)