<span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"></span></span></span>I will have to create a modeline that gives exatly 50Hz, as my TV only broadcasts 'Monitor' range values through EDID (as the DVI port is designed for a PC). This makes it difficult to get exatly 50Hz, as most calculation software/websites round the number to 2dp.
<br><br>Still, if thats what I need then....<br><br>Couple of questions....<br>- what does "OpenGL vsync" do?<br>- should I try and get XvMC working?<br>- I remember someone saying to turn of OpenGL Vsync when using BOB, is this true?
<br><br>Thanks in advance<br><br><br><br><div><span class="gmail_quote">On 07/08/06, <b class="gmail_sendername">Julian Edwards</b> <<a href="mailto:firstname.lastname@example.org">email@example.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">James Buckley wrote:<br>> I've been down this road before...<br>><br>> I'm using an 37" LG 37LP1D. It takes 1360x768 @ 50Hz without a hitch
<br>> (infact it's taken almost every modeline I've ever given it!). But<br>> it's getting the refresh to be exactly 50Hz which I find the hardest.<br>> On xtiming, if I type 50 for the refresh rate, when it's calculated it
<br>> normally says something like "Actually 50.04". If I use a refresh like<br>> 49.98, I can get it to say 50, but I think the value is still being<br>> rounded. How important is it to get a perfect 50Hz refresh.
<br>><br>> Also, I think some of the jerkyness is caused by the rubbishy graphics<br>> card. If I run glxgears, it uses 100% CPU (basically as much as it<br>> can), and if I do some CPU intensive task (like opening
<a href="http://openoffice.org">openoffice.org</a><br>> <<a href="http://openoffice.org">http://openoffice.org</a>> :P) it stutters really bad. I think that may<br>> be causing some of the erratic stutters I get (on top of the generally
<br>> stuttery playback), and may be leading to the prebuffer pauses.<br>><br>> I think I need a decent (i.e. normal) graphics card. :(<br>><br>> Thanks so far<br>There's nothing wrong with your graphics card! glxgears doesn't use any
<br>kind of vertical sync so will attempt to draw as fast as possible, hence<br>the high CPU load.<br><br>Like Wim said, you need a 50Hz modeline (yes, it's important to get<br>exactly 50Hz). If you run X up with --logverbose 5 it will tell you
<br>more about the modelines that it's using and what the vertical refresh<br>rate is. In your X config, set VertRefresh to 50.0 and this will ensure<br>it'll only pick a 50Hz vertical refresh rate. You will also need to use
<br>OpenGL vsync in Myth.<br><br>I am using an interlaced 50Hz modeline through svideo TV-out and OpenGL<br>vsync, and it's perfectly smooth (I have interlacing issues but that's a<br>different matter!)<br><br>J<br>_______________________________________________
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