[mythtv-users] Optimizing MythTV for AMD64

Jarod Wilson jarod at wilsonet.com
Mon Apr 4 07:17:47 UTC 2005


On Sunday 03 April 2005 14:12, Robert Tsai wrote:
> Anyway, using libmpeg, I run at about 75-85% CPU. Turning off libmpeg,
> I am now down to about 50% CPU. In both cases, this is about 12% for
> XFree86. Perhaps by coincidence, this confirms your reported CPU
> numbers below (although we have different CPUs).

Finally got around to trying HD playback on my own Athlon 64 system (only had 
it about 2 weeks now). Athlon 64 3500+, PCI-Ex GeForce 6600GT, Red Hat 
Enterprise Linux 4, gcc 3.4.

With ffmpeg decoding, I'm seeing a steady 75% cpu on 720p material. 1080i 
material with kernel deint bounces all over the place, from 50% up to 100%. 
Output is to a 21" CRT at 1600x1200.

With libmpeg2 decoding, the cpu is pegged on 720p material, and there's some 
occasional stutter. The cpu usage on 1080i material fluctuates again, but 
this time, only between 50% and 85%. However, the playback is actually worse 
than ffmpeg, despite the lower cpu usage (occasional stutter).

> What kind of deinterlace algorithm are you using? I'm using Bob.
> (Would that even be relevant to this performance discussion?)

Kernel deint here.

> In summary, turning off libmpeg has been good so I can confirm your
> results (although it sounds like I am more happy with that
> configuration change than you are).

Make that three of us who have seen worse performance with libmpeg2 on A64.

Also, on my box, the frontend reliably segfaults after exiting one recording 
and trying to view another. Need to investigate if this has already been 
fixed in cvs (been working with 0.17 here).

-- 
Jarod Wilson
jarod at wilsonet.com

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