[mythtv-users] HDTV on Myth -- is it a "myth?"

Joe Barnhart joebarnhart at yahoo.com
Sat Oct 9 19:29:43 UTC 2004


I guess my expectations were too high.  I've been
watching HD on my combo satellite/terrestrial receiver
a couple of years now, and I expected Myth to be able
to record and play signals equivalent to what I see on
"normal" HDTV (terrestrial) broadcasts.  What I
actually get on Myth is slow, jerky, stuttering
playback that often hangs the frontend with something
as simple as skipping forward or backward, or any
activity that pops up the on-screen display.

When I am able to get streams to play, the video is
marred by scaling artifacts and weird interactions
between interlaced and non-interlaced video streams. 
For instance, a 1080i source played on a 1080i output
device shows horrible jaggies.
(http://www.pbase.com/jbarnhart/image/34300421.jpg) 
The same stream played through the "bob" deinterlacer
looks better (but still not up to the level of the
receiver).

I tried to build a system able to handle this task,
with an Athlon 2800+ processor and a GeForce4 MX video
card, but the system is unable to cope with my
1920x1080i output device.  The Xv software player is
unable to keep up with task of decoding MPEG at this
rate, and XvMC simply doesn't work reliably enough to
watch an entire show without hanging mythfrontend.

Were my expectations too high?  Is this a matter of
"rough edges" soon to be smoothed out?  Or is the
current state of Myth unable to handle HDTV (at
1920x1080i) for anyone?  Should I dump my system and
buy new Intel Pentium hardware?  Or just go back to
the combo receiver and wait another year for the
software to catch up?

I would love to hear from anyone who is playing
streams at 1920x1080i with no stutters or poor video
quality.  What kind of system are you using?  Xv or
XvMC?  Intel or AMD?  Video card?


		
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