[mythtv-users] Xv and XvMC - what's the difference?

Jarod C. Wilson jcw at wilsonet.com
Fri Jan 9 02:23:39 EST 2004

On Jan 8, 2004, at 16:11, <Emlyn.Bolton at nokia.com> wrote:

> The MC expl. is helpful, now I'm guessing that this might get rid of 
> some of the jerkiness of the video on my PVR recordings.... perhaps?

Perhaps. Though other reports say that with XvMC support enabled, 
de-interlacing won't work, so you'll likely have other problems. :(

I presume you already have jitter reduction enabled, along with 
de-interlacing... You might try bumping up the resolution and/or 
bitrate on your captures and see if that helps. I see very few problems 
with my PVR-250's 720x480 8/16 captures. (Then too, I may just be used 
to it, after six months of not watching TV any other way ;-).

>> Could somebody enlighten me as to what Xv and XvMC are exactly, and 
>> whether
>> my assumptions are accurate.
> Xv is X video, an accelerated video standard. XvMC is X video Motion
> Compensation, which is an extension of Xv, but isn't very standard (at 
> least
> not yet).
>> I assume that Xv provides some form of direct access to the screen 
>> but I'm
>> unsure of the specifics.
> I don't really know the specifics either, but I believe you're on the 
> right
> track. Not sure if I was very helpful, but I didn't see any other 
> replies
> yet. :)

Jarod C. Wilson, RHCE

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