[mythtv-users] performance problem on old PC

[Chris Ribe]

Bitrate and resolution matter a lot here, too. Given comprable video quality
levels, MPEG4 takes significantly more CPU to encode.

If it doesn't, I may have to seriously reexamine my worldview, because this
is one of the cornerstones of my ontological framework.

On 11/3/05, Stef Coene <stef.coene at docum.org> wrote:
>
> On Thursday 03 November 2005 00:32, Todd Houle wrote:
> > I have been raving about MythTV to a friend of mine who finally
> > decided to try it himself. He had an old PC (1GHz Dell GX150) and 2
> > old tuner cards (avermedia and hauppauge win-Tv). I don't know the
> > details of the cards other than they both use the bt878 chips.
> >
> > We installed KnoppMyth as that is what he heard about elsewhere.
> > KnoppMyth detected everything perfectly and ran great. I added the
> > cards in Myth-setup, but we couldn't use it happily. There was a 1
> > second pause, for every second of live tv... I guess these cards
> > don't have hardware MPEG encoders on them and the computer couldn't
> > handle the load.. I lowered the quality way down, but still couldn't
> > get a smooth playback..
> >
> > I told him to get a better computer, or a TV card that supports
> > hardware encoding. Was I right? or was there something else I could
> > have done?
> I "downgraded" my mythbox from a Athlon 1400 (computer in the living) to a
> P3,
> 700Mhz (computer in the garage).
> The P3 can handle my bt878 based card, but I had to switch from rtjpeg to
> mpeg4 (rate of 1800kbit). When I used rtjpeg, the CPU was not powerfull
> enough so the video was stuttering. With mpeg4, the myth backend uses 85%
> CPU power.
> So it seems that the encoding of mpeg4 needs less cpu than rtjpeg.
>
>
> Stef
>
>
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>
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