Why don't you just use ffms2? It's working for me. For Avisynth+ the output is 10 bit. I'm not sure what happens to the extra bits, but it opens as 8 bit with Avisynth 2.6 and looks okay.
The only way I could get LSmash to output something sensible (the last XP compatible version) was to tell it to output 8 bit video. None of the higher bitdepth formats fixed the garbled video.
LSMASHVideoSource("E:\sheena-easton-machinery-small-sample.mov", format="YUV420P8")
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