[mythtv-users] Shouldn't XvMC be faster than Xv?

[Scott Alfter]

On Mon, Jan 16, 2006 at 11:13:49PM -0700, Chad wrote:
> On 1/16/06, Scott Alfter <mythtv at salfter.dyndns.org> wrote:
> > I've been playing around with Subversion builds lately, and I've noticed
> > something that shouldn't be the case: XvMC is substantially slower than
> > non-XvMC playback.  Even non-HD video won't play back smoothly with XvMC
> > enabled.  HD, of course, definitely won't play back under those conditions.
> 
> XvMC is currently working AFAIK, I've got SVN from about 3 days ago
> and it seems to be working just fine for me.
> 
> I'm running Gentoo (lastest emerge sync emerge world ~x86), Nvidia's
> latest GLX and Kernel modules, and outputting to a 61" Samsung DLP
> over a VGA port.

I think I figured out the problem: it was the nVidia driver.  8178 was the
version I had been running.  Falling back to 7676 got XvMC working properly
on most of the streams I've thrown at it so far.  

The only sticking point now is the HD feed from the local Fox affiliate.
mplayer claims the streams are encoded at about 38.8 Mbps, which is
impossible (but mplayer plays the streams OK).  I'm fairly sure the streams
are actually encoded at a lower bitrate.  King of the Hill takes ~3.2 GB,
which is about right for 30 minutes of HD.  HD streams from other channels
report more reasonable bitrates; for instance, the most recent Law & Order:
Criminal Intent is reported as being about 15.4 Mbps).

I suspect that's a problem elsewhere, though (maybe even with the
broadcaster), not with the display hardware here.

  _/_
 / v \ Scott Alfter 
(IIGS( http://alfter.us/            Top-posting!
 \_^_/ rm -rf /bin/laden            >What's the most annoying thing on Usenet?

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