[mythtv-users] TV Out with Live TV

Mark Greenwood fatgerman at ntlworld.com
Fri Jun 13 13:52:48 UTC 2008

I've just succeeded in getting my Nvidia TV Out working (in TwinView  Clone mode) on my frontend (A Sony VAIO, Core II Duo 2GHz Nvidia 8400 512MB). The backend is a 1.8GHz Athlon and they're connected by 100MBit ethernet. I've noticed that I'm getting a fair amount of what you might call 'lag' on the output picture. It looks as if the computer can't quite keep up - fast moving sections glitch occasionally, or go 'wobbly' as if it hasn't finished drawing one frame before the next frame starts. It can't be overloading the processor, surely? Or can it? I guess it's a laptop graphics card but even so... 

The TV resolution is different from the laptop's native flat panel resolution (TV is 1024x768, laptop is 1280x800) so I'm running the whole thing using a MetaMode which has set both of them to 1024x768, so I guess the graphics card is having to do some work rescaling the picture (it stretches it to fit the laptop screen). The wierd thing is that when I'm running Myth, the picture has the correct aspect ratio on both screens !!??!!

So what does Myth do in the situation where there are two displays in use? Is there more processing going on that might slow it down? Is there a way I can run this with the laptop screen disabled? Anybody have any other ideas?


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