[mythtv-users] Resolution
Alan Snyder
ax763 at yahoo.com
Tue Dec 2 13:06:55 EST 2003
>
> On Monday 01 December 2003 17:10, Javier Santos
wrote:
>
> > I have just set up mythtv on my Gentoo system.
Everything is working
>
> > fine. I have got choppy video with RTJPeg at
480x480 (default)
>
> > resolution, but it works ok at 320x240.
>
> >
>
> > My setup is:
>
> > Celeron 1200 Mz
>
> > Pinnacle PCTV
>
> > Nvidia TNT rage
>
> >
>
> > The disk dma is turned on, my distro is Gentoo and
my kernel is 2.22
>
> > with preemption and low latency.
>
> >
>
> > Should I expect 480x480 resolution to work without
dropping
> frames or
>
> > I just should buy a Hauppauge PVR?
>
>
>
> I can do 480x480 on my Athlon XP 1600+ (I assume you
mean
> LiveTV). Your
>
> machine is a bit slower, but I'd guess you should be
able to
> handle it.
>
> What are your recording profile settings (not just
resolution, but
>
> quality & MP3 settings)? Also, how much/what kind
of RAM do
> you have?
>
> Try setting your MP3 quality at 7, and turn down the
RTjpeg
> quality to
>
> around 172 or so. Though you may like the picture
better at 320x240,
>
> or 320x480, rather than turning down the quality.
Fiddle
> with it until
>
> you get something you like.
>
I have an Athlon Thunderbird 1 GHz, 266 MHz FSB, 256
MB DDR,
generic bt878 card (Kworld) and an nvidia
GeForce2-440MX,
running under Mandrake 9.1. Both Rtjpeg live tv and
mpeg4
recordings, both at 480x480 with all other settings at
default (mpeg4 is at 2200 Kb/sec at 640x480, scaled
with
resolution, don't recall other settings).
I use around 30-40% CPU to record. I don't recall my
numbers
for playback, live TV or watching a recording in
progress,
but the worst case was around 80% CPU.
I do notice that both live TV and recordings have a
"film-like" quality to them. I suspect that this
relates more
to the compression than to any CPU limitations, since
when I
tried KnoppMyth on my 1.6 GHz Pentium-M notebook the
look
was basically the same.
I recently noticed the pretty modest CPU requirements
they
specify for Freevo at lower resolutions. I tried
KnoppMyth
on a 460 MHz PII with 256 MB RAM (100 MHz FSB) and a
Voodoo
Banshee video card (salvaged from our local recycling
center).
It nominally worked (I was in a hurry and didn't check
CPU
utilization).
The bottom line to me is that you can get
better-than-VCR
quality with a rather modest CPU, especially for
frontend-
only.
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