[mythtv-users] RE: Why does it take 20% cpu power to run mythfrontend when it used to take 4%?

[Gregory J. McGee]

> Message: 22
> Date: Fri, 23 Apr 2004 21:18:17 -0400
> From: mark <fairlane at springcom.com>
> Subject: Re: [mythtv-users] RE: Why does it take 20% cpu power to run
>         mythfrontend when it used to take 4%?
> To: Discussion about mythtv <mythtv-users at mythtv.org>
> Message-ID: <200404232118.17957.fairlane at springcom.com>
> Content-Type: text/plain;  charset="iso-8859-1"
> 
> 
> > Recording in MPEG4 is my guess. _HUGE_ CPU sucking going on there,
> esp
> > with HQ/4mv set---remember, recording is real time, and NOT niced in
> any
> > way. It will suck all the CPU power it needs to keep up.
> 
> But see the wierd thing is, it's ALWAYS been MPEG4/4000 bitrate/544 x
> 480, 
> since the beginning, and the thing has gradually slowed down to the
> point 
> it'll barely run.  0.10 was perfect.  You couldn't make it skip if you
> tried.  
> 0.11 was glitchy, 0.12 was alright but skipped occasionally, and it's
> gotten
> really bad on 0.14.  The options I've used, and the settings for
> compression 
> have never changed.  That's the wierd part.
> 
> 
> > My frontend now is an xbox, works great, and using mythtransode as
> > intended works so much better. The backend runs almost unnoticed
> now.
> 
> A separate frontend is not really an option at this point.  Maybe
> someday.
> 
> >
> > Record rtjpeg, auto transcode, and in your transcoding profile, use
> > mpeg4, hq/4mv, same resolution.
> 
> I don't really have the disk space to record in RTJPEG.
> 
> >
> > I record at 704x480, 210, transcode same res, hq/4mv 2200 bps.
> >
> > It will look SO MUCH better, and run stably. It's a feature. Use it.
> > (Mythtranscode still thrashes the HD, even niced, think of it as a
> fast
> > processor penalty) Too bad nice can't be told NOT to use 100% cpu
> when
> > available...

OK, if you put it like that, that sounds weird. Perhaps something in the
xvid codec has changed? (That's where the CPU power goes)

recording 1 hr of rtjpeg at 210 gives you a ~8g file, which will go away
once mythtranscode is done.

I was curious, installed/fired up knoppmythR4(myth0.12) on a spare
partition, and the settings you describe took 76% CPU just recording
(avertv stero BT878, set box at 180x10/athlonXP.(cas 2 Kensingtom HyperX
memory, but rev 1 NF2, FIC AU11) 

I effectively have 2 frontends---One on my PC, and the Xbox under the
big rear projection Phillips in the LR.

Seems knoppmyth has been updated from R4---have to take another look.
-- 
Gregory J. McGee <gjmcgee at cableone.net>