[mythtv-users] MythTV, smooth playback on 3ghz, and 1080i?

Steve Adeff adeffs at gmail.com
Sun Jan 1 18:23:37 UTC 2006


On Sunday 01 January 2006 12:56, Rob wrote:
> Got a question for those of you running 3ghz processors [b]without[/b] XvMC
> decoding 1080i and deinterlacing successfully.  What is your secret?  I've
> tried 3 different machines with 3ghz (or close to it), and none of them
> come anywhere close to being able to do 1080i video smoothly in Myth.   I'm
> running Deban and have built Myth and have tried optimizing it for the
> processor I'm using and such, and it never seems to matter.    The OSD is
> the worst offender by far, when that is up it's jerk city.   1080i video
> sometimes managed to get by at full framerate and sometimes doesn't, it's
> inconsistent.
>
> Now, I can enable XvMC and everything plays back perfectly smooth, but as
> noted by most FAQs, the OSD is in black and white, sometimes flickers
> badly, and causes the screen to jerk.  Once it goes away everything works
> okay. Most of the FAQs and posts I've read from people seem to indicate a
> 3ghz processor is plenty of horsepower to do 1080i without xvMC.  Why does
> it perform so badly on my system?   I think perhaps if I can find my
> performance problem even xvMC will work work better.
>
> I apologize if this is in a FAQ or has been discussed ad nauseum, but I've
> been at this for over a week and haven't found anything.
>
> Video card is a FX5200
> Nvidia 7676 driver
> Currently testing with P4 3ghz, but have also tried Athlon 2800+
>
> Things I've tried:
>
> Open GL overlay (does this even work with NVidia drivers?)
> MPEG2Dec decoder (seems to make it worse)
> Various deinterlace modes - performance is just as bad with it "off"
> Sync to video
> Myth "stable" version 18.1 and the SVN head
>
> Any help greatly appreciated.

AMD Athlon64 3200+
standard decoder, extra audio buffering, kern deint.
plays back fine considering I'm outputting as 720p (stupid tv...) even for 
1080i, occasionally I see what looks to be missed frames, but when I playback 
on a monitor its fine so its something to do with the tv...

-- 
Steve


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