you can use huffyuv in avi (avs2avi and encode to huffyuv via ffdshow VFW) and load it back as AVIsource (enable in ffdshow in VFW huffyuv decoder!)
or you can use avs2yuv, avs2pipe, ffmpeg for y4m (Get it in avisynth back with Rawsourse())
or use x264 .... --crf 0 and load back with ffmpegsource2 or DGDec
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