AFAIK, FFV1 only works in YV12, so if you're feeding it anything except that you are not encoding lossless. An AVISynth script could compare the original to decoded FFV1 to make sure.
Also, CorePNG with Auto-Delta frames at the maximum compression level would likely beat all of these for size, but unless you have an Athlon 30,000+, you aren't going to be capturing with it in real time.
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