[mythtv-users] Choppy HDTV playback

[Steven Adeff]

On 2/8/07, Jarod Wilson <lists at wilsonet.com> wrote:
> On Feb 08, 2007, at 18:21, Steven Adeff wrote:
>
> > On 2/8/07, Jarod Wilson <lists at wilsonet.com> wrote:
> >> Steven Adeff wrote:
> >>> On 2/6/07, Yan Seiner <yan at seiner.com> wrote:
> >>>> OK, I have recording happening!
> >>>>
> >>>> Thank you everyone!
> >>>>
> >>>> I am running 0.20-fixes, and it all seems to be working.
> >>>>
> >>>> I can record on both tuners, and play back - almost.  (Aside: the
> >>>> backend has 4-400GB Seagate SATA drives, and those things are
> >>>> *NOISY*!!!
> >>>> Definitely not recommended for a frontend; with both tuners
> >>>> recording,
> >>>> it sounds like someone is rolling a tin can full of steel balls
> >>>> inside.)
> >>>>
> >>>> Typically I transcode the HDTV recordings down to 720x480 so my
> >>>> other
> >>>> frontends can handle them, but I have two front ends that should
> >>>> be able
> >>>> to handle the full resolution stream.
> >>>>
> >>>> When I try to play them, though, I get very choppy playback - two
> >>>> seconds of play, pause, two seconds of playback, pause....
> >> [...]
> >>>> Is that right?  Where do I look?  Backend should be adequate -
> >>>> it barely
> >>>> breaks a sweat.  Poseidon (the frontend) is an Athlon 2800+ with an
> >>>> Nvidia 6200 and DVI out to a 1366x720 LCD panel.  Not enough
> >>>> horsepower
> >>>> there?
> >>>
> >>> not without XvMC enabled, no. You'll want at least a 3200+ on
> >>> Poseidon.
> >>
> >> Note to self: figure out exactly *why* you can play back both
> >> 1080i and
> >> 720p material just fine on a 2600+ w/o xvmc...
> >
> > 1080i streams have a much higher resolution than 720p, 2073600 vs
> > 921600 per frame. So you may be able to handle 720p with that
> > processor, 1080i is just too much.
>
> Only it isn't. My 2600 plays back 1080i material just fine as well.
> Roughly 2 years ago, I had an Athlon XP 1800+ that could *almost* cut
> it for 1080i material as well.
>

ah, yea, my 1600+ can barely cut it at 720p, and if I try 1080i
without deint its a no go, though with XvMC it seems to work fine,
except when an OSD is up =(

I just can't justify upgrading just the processor on this system, I'd
sooner spend a little more and get a mATX and 3200+ system and that
won't happen for a while. I really don't watch much HD in the bedroom,
21" vs 65" in the living room...

-- 
Steve
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