On Mon, Mar 07, 2005 at 08:49:05AM -0500, Matt Vollmar wrote: > Sounds to me like the opengl_vsync issue. You need to recompile Myth > without opengl_vsync set. I don't think anyone has found a different > work-around. I did this and everything was peachy. It's worth a try, > anyway. Search for it on the list if you aren't sure what this means.
Hi, Regarding this issue, I posted the following mail in mythtv-dev: http://www.gossamer-threads.com/lists/mythtv/dev/116337 I got no answers. Since this seems to be a more active community, I'm hopping someone can comment on it. If you don't feel like opening a web browser, the message follows. ------ Re: Playback problems with mythtv 0.17 [In reply to] On Fri, Mar 04, 2005 at 08:50:57PM -0300, Robson Braga Araujo wrote: > Hello, > > I'm having playback problems since I upgraded from 0.16 to 0.17. The > video plays too fast, gets ahead of the audio and generates tons of > prebuffering pause messages. I tried the latest cvs version, but no > luck. This happens if I'm watching live TV or any prerecorded show (no > prebuffering pauses here, obviously). > > I have a PVR-250. I tested with the drivers 0.1.9 and 0.3.2f. I'm also > using a SB Live! and a nvidia GeForce2 MX/MX 400 with the latest > drivers. > > I ran 0.16 (which plays fine) and 0.17 with -v all and generated too log > files for comparison. They are here: > > http://valfenda.cjb.net/~robson/log.0.16 > http://valfenda.cjb.net/~robson/log.0.17 > > Do you need any more information? > Thanks for any help. After a good saturday trying different CVS versions to see when the bug appeared, I discovered that it is in the method OpenGLVideoSync::WaitForFrame in libs/libmythtv/vsync.cpp. If I use another sync method like RTCVideoSync or BusyWaitVideoSync everything works fine. The change that introduced the bug appeared between 2004-09-25 and 2004-09-26. The OpenGLVideoSync::WaitForFrame used to have a loop that did not exit until m_delay was less than or equal 0. It was substituted by two ifs that I'm guessing should do the same thing but they don't. I tried reverting the OpenGLVideoSync::WaitForFrame method to the old version in the current CVS and now everything is working. The attached patch changes the first if for a while and gets rid of the second if because it would never be entered this way. Is it the right way to do it? -- []s, Robson Braga Araujo Ciencia da Computacao - UFMG http://www.dcc.ufmg.br/ Akwan Information Technologies http://www.akwan.com.br/ Hobbes : Well, you still have afternoons and weekends Calvin : That's when I watch TV.
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