[mythtv] Video problems after pausing Live TV with 720p?
ignasiak at gmail.com
Fri Sep 9 03:25:48 UTC 2005
Does anyone have suggestions for things to check to diagnose this?
As Jack mentioned, it's as if the 720p video is going through some
interlacing issue, and ends up corrupted (image displayed twice, one
shifted half way down the screen).
It only happens after pausing Live TV, and only on 720p content. I
can pause & resume a recorded (or currently recording) program just
---------- Forwarded message ----------
From: Todd Ignasiak <ignasiak at gmail.com>
Date: Sep 6, 2005 2:41 PM
Subject: Re: [mythtv-users] Video problems after pausing Live TV with 720p?
To: Discussion about mythtv <mythtv-users at mythtv.org>
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
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 :)
> --- 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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