store halfpel filter coefficients in the header as well as the
flag for diagonal interpolation the primary reason for this change is that previously MC up to 1/4 pel matched H.264 exactly and that increases the risk of stumbling over patents secondary does this allow 0.10 db or more quality gain by choosing a longer filter and the filter could also be choosen optimally for each frame though that of course would cause speed loss at the decoder and encoder side ... git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10436 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
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