search for: quarterpel

I hope this list is small enough for not beeing banned when introducing oneself. So... Hi, I just subscribed to the theora-lists. I'm from the XVID project, so I know a deal about video and MPEG-4 in particular, but nothing about Vorbis/Theora etc., That's why I'm here, because I'm interested in patent-free alternatives. I guess there is no documentation of the current status

...do get it to run, you will immediately notice something missing, like all of the motion-compensated macroblocks. There are 2 things at work here: I can not even begin to understand how ffmpeg does half-pel motion compensation (needed for Y MC), and I still have not completely examined how VP3 does quarterpel MC (needed for U&V MC). This is the single comment packaged in the VP3 source: "For the U and V planes the MV specifies 1/4 pixel accuracy. This is adjusted to 1/2 pixel as follows ( 0->0, 1/4->1/2, 1/2->1/2, 3/4->1/2 )." Any clarifications on ffmpeg's MC facilities...