[mythtv-users] More XvMC data points

Michael Tiller michael.tiller at gmail.com
Wed Nov 29 16:22:07 UTC 2006

Just out of curiosity...when you say 65-75% CPU utilization, how is that
partitioned between the X server and the frontend?  I ask because if I try
and watch without XvMC on my system, the X server is something like 30% and
the frontend is like 70%.  I'm wondering if this load on the X server can be
avoided somehow.  Then I might have a chance to watch HD natively.

It seems crazy to me that with such fast CPUs, HD playback is not a given.
My Windows machine (2.4GHz P4) can process HD streams from my HDHomerun
without a hiccup?!?  Why should a 2.8 GHz (granted, it is a Celeron) have so
much trouble?!?


On 11/21/06, Mark Chang <mark.chang at gmail.com> wrote:
> Just wanted to drop in a few data points to the list. You've all been
> so helpful, so here is something for the archives in case someone else
> is trying to build a cheap HD box.
> Trying to do HD frontend/backend on an Athlon64 3200+ with an Nvidia
> 6200TC. Using stock, binary, Ubuntu Edgy installs, and an HDHomeRun.
> This seems to be enough horsepower to decode all varieties of OTA
> *without* XvMC if I only use Linear Blend. Bob and Kernel caused
> stuttering. XvMC did nothing better, and it was perhaps even worse. I
> was happy.
> Then I saw the XvMC portion of the wiki:
> http://www.mythtv.org/wiki/index.php/XvMC#Tips_and_Tricks
> I turned off Sync to VBlank using nvidia-settings and voila, I can use
> Bob and Kernel without XvMC. I am now happier! XvMC does NOT seem to
> lower my CPU usage, however. I am seeing 65%-75% decoding high-bitrate
> HD (7gb/hr) without XvMC and WITH Bob 2x.
> There. That's my two cents.
> --
> Mark L. Chang
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> mythtv-users at mythtv.org
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