[mythtv-users] Choppy HDTV playback

Steven Adeff adeffs.mythtv at gmail.com
Thu Feb 8 23:21:48 UTC 2007


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.

-- 
Steve
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