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Now, in order to prohibit unexperienced users from applying the above filters to interleaved color spaces, we have added the boolean variable planar to RemoveGrain, Repair and TemporalRepair. If planar=false (the default value), then these filters reject YUY2, RGB24 and RGB32 frames. Only if planar=true, then these filters accept YUY2, RGB24 and RGB32 input, but always assume that the data are organised in a planar way. If you use planar=true with ordinary interleaved input, you get garbage.
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I'd say it's never actually useful and I agree with tp7 decision of removing it entirely.
If I set planar=false I'm expecting the filter to work with non planar color spaces, not rejecting YUY2, RGB24 and RGB32.