Most of this conversation is correct. YUV output will allow less data to be sent per frame to the card. This means we can achieve a higher frame rate and their should be less chance of tearing though it does not eliminate it(unless we can get fancy and dma to a spare location and then blt the data on the card to the correct location which would give us a better chance of guaranteeing not to tear but may hurt the frame rate a little). Quite often the data is already YUV decoded so we could end up saveing CPU by being able to play back YUV and the Xv support is probably a better optimized code path through things like mplayer so the cpu load might well reduce from that needed for the current X playback.
Yes it is likely that this is the equivalent of mpeg playback so the OSD should still be accessible as well. I think that answers most questions (other than a timeframe for implementing it) John > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:ivtv-devel- > [EMAIL PROTECTED] On Behalf Of Sager, Jim > Sent: 07 March 2005 20:13 > To: '[email protected]' > Subject: RE: [ivtv-devel] YUV Decoding > > On March 7, 2005 02:21 pm, Kohlsmith, Andrew wrote: > >> without any tearing. Of course the quality of playback will be > dependent > >> upon the speed of the computer's processor since the computer will be > >> decoding the video to YUV before passing it along to the PVR-350. > > > >Well it's currently converting between the source format and RGB to get > it on > >the X framebuffer, is it not? > > Yes, I believe this is true. You have enough horsepower to convert the > source > format to RGB at the required frame rate, however, the speed of the OSD on > the > PVR-350 is going to create the tearing effect when trying to keep up with > the > required frame rate of the video. YUV decoding should eliminate the OSD > bottleneck, limiting the quality of video playback to that of the > processor's > ability to convert the source format to YUV and push it out to the YUV > buffers > at the required frame rate. I think that I have this right. Somebody > please > steer me back on course if not. > > Jim > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > ivtv-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ivtv-devel ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ ivtv-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ivtv-devel
