Joni Kähärä (joni.kahara@xxxxxxx): > If you can spare that amount of RAM then grab YUV42? frames. More > knowledgeable people, please correct me if I'm wrong, but I understand > that YUV420 for example takes WIDTH * HEIGHT * 1.5 bytes of memory; > one PAL frame would be 768 * 576 * 1.5 = 663552 bytes. So if you have > 192 megs of memory you will get: > > 201326592 / 663552 = about 300 frames. That's using 4:2:0 sampling. For best quality from broadcast TV, you really want to sample at 4:2:2. That would mean about 864k per frame, and so only about 9s worth of frames in 200M. :) Then again, if you encode to MPEG you're probably going to use a 4:2:0 profile unless you really do care about quality and find an expensive encoder. In that case, you can downsample the chroma yourself, but be careful! The bttv driver does not give full-frame chroma in the way MPEG expects it! -- Billy Biggs vektor@xxxxxxxxxxxx
