On Tue, 17 Apr 2007 14:27:02 +0300 (EEST) Vesa Solonen <[EMAIL PROTECTED]> wrote:
> On Mon, 16 Apr 2007, Attila Kinali wrote: > > > The issue of stream synchronus playback can be entirely > > solved in software and does not need to be done in hardware. > > Unless you need A-V sync below 0.5*frame-time, then you need > > at least a little bit information from the graphics card, when > > the current image drawing is finished, but any half decend card > > supports this. > > The problem is _not_ A-V sync, but interference jitter between different > frame rates. Please have alook at: > > http://www.linuxtv.org/wiki/index.php/The_DVB_Decoder_Challenge#Screen.2FDecoder_Sync_Aliasing Nice explanation, but it's wrong IMHO. First you need to realize that frames in video codecs are sampled _below_ the niquist criteria. That's why there is a need for motion compensation. The second thing is that human eyes don't work like ears, they don't percieve movements as signal modulations. So the whole argumentation about niquist frequency while showing movies falls flat. As i said before, the only issue here involved is keeping high a-v sync ratios. As long as the refresh rate of the monitor is as high as the frame rate of the video, you can safely ignore any difference between those two. Attila Kinali -- Linux ist... wenn man einfache Dinge auch mit einer kryptischen post-fix Sprache loesen kann -- Daniel Hottinger _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
