[mythtv-users] XvMC - Nvidia isssues?

[Justin Hornsby]

On 22/01/06, Dan Seddon <dan.seddon at framestore-cfc.com> wrote:
> Hi
> This is my first post to the list after getting my system up and
> running. I have a Mythtv setup which I'm really pleased with it's 95%
> perfect! However - that remaining 5% is always worth persuing so... I'm
> using XvMC which means my Athlon XP 1600 trundles away at 15% usage
> whilst playing DVB-T (standard definition PAL) video. This has 3 issues
> which reading through the list have been mentioned on and off - but I
> haven't found all the answers.
>
> First off - the menus become monochrome, which isn't a biggy and worth
> putting up with for the performance gain (but it would be nice to know
> if this is preventable).
>
> Secondly the menus cause the video to jump when they appear, which can
> be very distracting -  this has been mentioned a lot on the list from
> what I can see. Hopefully I have something useful to add here.... I have
> Quadro FX500 card (don't ask why I'm sticking such an expensive card in
> a PVR box) and I found enabling overlays ( |Option "Overlay" "true")
> |gets rid of this problem - this is listed as a quadro only option and
> I'd be interested to know if anyone has success with this option using a
> non-quadro card, as I could then sell it as I've been intending to do.....
>
> Lastly the problem which I count as my final 5% - I have an issue with
> some programs where the video stutters (the video may stutter in time
> too, but it's hard to tell when your ears are hurting). It's been a
> complete bafflement to me as it happens on only some programs (not
> channels) and non of the configurations I've tried get rid of it (other
> than diabling XvMC) - playing the same .nuvs with mplayer reveals that
> the only unique characteristic of these recording seems to be that the
> audio is at 256 kbits, whereas most of the other recording I have are at
> 192... I haven't been very scientific in checking it - but it seems to
> be consistant, having checked a few recordings. It happens to about 1 in
> 5 recordings, or maybe less, at the moments - but is fustrating as I
> have to go in to my options and reconfigure everytime I want to watch
> such a recording. I've only seen this issue posted once by a guy who
> said he was using the via equivalent of XvMC (I haven't found his post
> again - as it was a while ago) - which might be important as is implies
> it isn't a driver problem (I get the same issue when running the
> frontend on my laptop with a completely different sound card and older
> Quadro card). Is anyone else familier with this problem? I'm in the UK -
> where we don't have HDTV yet, so I can't be that my systems overwhelmed
> by what I'm throwing at it?
>
> Any help/interest would be appreciated.
>
> Dan
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>
I used to have problems playing back some DVB-T recordings, notably
from shows which had 2 audio tracks (one blank, presumably 'audio
description' and the normal stereo audio track).

I managed to fix it by changing the capture card settings (advanced
option in mythtv-setup in the capture card page) to only use TS
recording.  This is now the default behavour in SVN and can't be
changed from mythtv-setup.  The result is - no more recordings with
dodgy audio.

Regards,
Justin