[mythtv-users] Video problems after pausing Live TV with 720p?

[Todd Ignasiak]

Thanks Jack,  at least hearing that someone else is seeing similar
issues gives me a bit more confidence that my system is not just
totally screwed up.


For what it's worth,   I sometimes see symptoms similar to what you
are describing, in tuning or changing channels.   But, I frequently
upgrade to the latest svn release, so the behavior I see changes
frequently.

Last night I could not get MythTV to change channels.  When I went to
live TV, it would show the initial channel it tuned, but if I tried to
change to another channel, the backend would generate a ton of error
messages about not getting data from the dvb device.     So, with
mythweb, I selected two seperate HD channels to record simultaneously
(I have an HD3000 and a FusionHDTV3 tuner cards) and that worked
great.   I could go in and view recorded programs, but just not live.

On 9/6/05, Jack Perveiler <perveilerj at yahoo.com> wrote:
> I see something similar to this problem.  I haven't seen it after a pause, but
> I DO see it SOMETIMES when I change to a 720p channel.  Sometimes it works just
> fine, other times it seems like the deinterlacer has screwed up somehow (no
> xvmc, bob deinterlace w/opengl vsync).  I don't have any evidence it's the
> deinterlacer, but the effect looks like a deinterlacer gone wild.  Exiting to
> the menu then going back to LiveTV fixes it for me.
> 
> I haven't seen it after a pause because switching channels itself seems to be
> problematic for me (pcHDTV 3000, 0.18.1).  Sometimes it works just fine, and
> other times (about every 6th channel change) I get terrible colors and a
> picture so botched you can't make out anything on it (usually a bunch of pink
> and green blocks on the screen).  A friend down the street has identical
> behavior with a different distribution (KnoppMyth vs FC4), although he also has
> a pcHDTV 3000.  When this problem occurs I have to restart the backend or all
> future recordings will be pink, green, and unrecognizable :)
> 
> Oddly enough, both problems are on live TV only.  Recordings work just great.
> Why myth can play back a recording just fine but not live tv (which is really a
> recording, the ringbuffer) and change channels to record perfectly every time
> but not to watch live (which is really to record to the ringbuffer) is beyond
> me.  One of these days my wife + kid will go out of town and I'll have some
> time to update to svn and check out the source.  Until then I have no room to
> complain :)
> 
> These 2 issues have caused me to totally abandon HDTV live tv for the time
> being.  I've heard there's a ton of DVB re-work going on in SVN, so I'm hoping
> they gets fixed along the way.
> 
> Sorry I don't have anything helpful to add, but nobody responded to your
> original post and I wanted to at least let you know you aren't crazy :)
> 
> --Jack
> 
> --- Todd Ignasiak <ignasiak at gmail.com> wrote:
> 
> > Is anyone else seeing problems viewing live HDTV, when resumbing
> > playback after pausing?
> >
> > The video is playing fine, then I pause, and resume after a while,
> > then the video gives a weird effect, where it looks like two images,
> > with one offest 50% vertically (the image is displayed twice, with one
> > shifted up half way).    It then sort of flickers back and forth,
> > displaying both images.   It continues in this mode until I change the
> > channel.   If I change back to the problem channel and display live
> > tv, it works fine -- until I pause again.
> >
> > I have only been able to reproduce this on 720p channels (ABC, Fox,
> > ESPN).  1080i stations don't seem to show the same effect.
> >
> > My display is a 1280x720 LCD panel.   XvMC is disabled.   NVidia
> > FX5200 card with 7676 drivers.  Running on Gentoo x86-64 with the
> > latest svn snapshot of MythTV (I have tried this with several versions
> > over the last couple weeks).
> >
> > Anyone else seeing this?
> > _______________________________________________
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> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> 
> 
> 
> 
> 
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