I have changed several times the default MVC decoder in the past, usually after a user's suggestion. IMO, both are equally good. Since both are based on the same decoder (by Sony), the speed is more or less equivalent.
With "useless", I mean the users of BD3D2MK3D will not see the difference, as FRIM does exactly the same thing, and even a bit more : FRIM can stack the two views horizontally or vertically, and therefore only the final resize (for Half-SBS or Half-TAB) must be made by avisynth or x264. I haven't checked that yet, but perhaps the whole conversion will be faster with the FRIM stacking. If it's the case, I may modify BD3D2MK3D to use the full potential of FRIM. At least, that will be a good reason to drop DGMVCDecode.
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