Gerd Knorr wrote: > > > Should you have any questions, please ask... > > [ Cc'ing the video4linux list ] > > Is there any clear definition how VIDEO_PALETTE_YUV420 should look > like? There are two contradicting usages for VIDEO_PALETTE_YUV420: > > (1) - the one used by the philips driver, which is a packed version > of VIDEO_PALETTE_YUV420P. > http://www.smcc.demon.nl/webcam/api.html#palette > (2) - the v4l1 compatibility layer for v4l2 assumes > VIDEO_PALETTE_YUV420 == VIDEO_PALETTE_YUV420P. > > Alan's API document has no details about VIDEO_PALETTE_YUV420 ... > > On the web I havn't found any specification for a packed YUV 420 > format, everybody seems to use "YUV420" for the planar format > (guess that's why v4l2's compatibility layer makes no difference > between VIDEO_PALETTE_YUV420 and VIDEO_PALETTE_YUV420P). > > Anyone knows whenever the somewhat strange yuv packing used by > philips is standard? And whenever it is really called "YUV420"? > URL? At one stage I looked long and hard to find an official YUV420 format. I found nothing, but all the apps I found were expecting YUV420P, which is why v4l2 ends up mapping the two together. So it is entirely possible that the Philips one could be correct (it is the only packed definition I have seen that makes any sense). -justin
