[mythtv-users] On video w/mostly black,

[wishbone at h4b.org]

So I tried what Tim mentions below and it has gotten a bit better.  Fades to
white or all black don't seem to bring myth to a crawl any longer.  But I'm
still getting some bad studdering on comedy central (directv).  So what's the
deal with this?  What would cause studdering based on brightness/contrast
settings?  FYI previous to this I have NEVER touched those settings so I was
experiencing pretty bad studdering with default settings.  I do still
experience it with black, but it's a lot better.

Devs any comment on this?  It seems several people in this thread are
experiencing the same thing.  Known bug, or all we all mad?

On another note is it possible to adjust these settings during playback of
recordings at all?

TIA,
joshua

PS
mythtv .12
.12 version of cvs ivtv from jens (although I experience this problem with ALL
versions of ivtv back to what I started with several months ago that seemed to
work fine)

On Sat, Nov 22, 2003 at 10:44:31PM -0600, ttempl-myth wrote:
> Just wanted to chime in that I'm experiencing the same issue.  Stutter on
> mostly black or mostly white screens during mythtv playback.  Both in LiveTV
> and recorded programs, nothing else going on while recording. Pausing makes
> no difference in LiveTV.  No messages from myth or ivtv. Seems to be in the
> recorded file as it happens at the same place everytime on playback.  Yet,
> Mplayer/Xine/Windows Media player all play back the file fine.  Perhaps they
> just handle the corrupted mpg better?
> 
> It was quite sever on my system until, of all things, I reset my contast
> settings back closer to default.  I know that sounds strange, but I did have
> my contrast set to around 36-38% and some shows that weren't even that dark
> were chopping.  For example X-play on techtv would start studdering on just
> about every game segment they showed, and a night scene in a movie I was
> watching was pretty much a slide show.  I actually stumbled across the
> contrast thing during that movie.  I just cranked the contrast/brightness
> for the heck of it and it smoothed out; put thing back down and it was
> choppy.  I think I set things to 48% and then up the brightness some to
> compensate, and things are pretty good now.  Just the occasional studder on
> fades for the most part.  Haven't tried going higher than that to see how
> things go.
> 
> Anyway, I'd be curious to find out the contrast/brightness settings of
> others and to see if it worsens for others at lower contrast settings.  I
> don't know that will really tell us, but maybe it would give something for
> the ivtv or myth guys to work with...
> 
> Other pertinent info...
> Asus Pundit
> Celeron 2.2
> 512 MB RAM
> Seagate Barracude 7200 8M cache
> Ebay OEM PVR-250 using svideo in.
> KnoppMyth r4(same results with Mandrake 9.1 and Gentoo)
> 
> Tim
> 
> 
> ----- Original Message ----- 
> From: <wishbone at h4b.org>
> To: "Discussion about mythtv" <mythtv-users at mythtv.org>
> Sent: Saturday, November 22, 2003 10:02 PM
> Subject: Re: [mythtv-users] On video w/mostly black,
> 
> 
> > Yes...  watching the file directly with mplayer and windows shows no
> > problems at all.  Which I actually hadn't tested yet.  I was actually
> refering
> > to useing mplayer to watch /dev/video directly and it doesn't have any
> > problems.  However, when I watch the recorded show with myth it studders
> in the
> > same place every time.  It appears particularly random, although it does
> seem
> > to happen more often when there is a lot of black on the screen.
> >
> > I am not watching a pre-recorded program when anything else is recording
> or
> > watching live-tv.
> >
> > I've tried pausing live tv and it doesn't help at all.  Even rewinding,
> but
> > like I said it seems to appear exactly in the same spot every time.  Low
> motion
> > VBR problem maybe?  (yes I'm reaching here for anything)
> >
> > no error or otherwise strange messages from mythbackend or frontend logs.
> >
> > DMA is always a possible solution, but I see this regardless if I'm
> watching a
> > show currently being recorded, or just watching an old recording.  I've
> tested
> > this with NOTHING else happening on the box.
> >
> > Hope that helps get us closer =T  I'll turn on extra logging options if it
> will
> > help?
> >
> > thanks again,
> > joshua
> >
> >
> > On Sat, Nov 22, 2003 at 10:35:10PM -0500, Chris Pinkham wrote:
> > > > It is in the recorded file and why wouldn't it show up in live tv?
> Isn't live
> > > > tv "recorded" and you watch the ringbuffer file?  Anyway mplayer works
> fine and
> > > > you can watch the live stream /dev/video without any problems.  I'm
> not sure
> > > > about the other person who just mentioned this problem but I only seem
> to be
> > > > having the problem in myth.  Anyway, the studders are ending up in the
> recorded
> > > > files as well and not just in "live" tv.
> > >
> > > So you ran mplayer on one of the Myth recorded files and mplayer
> stuttered at the
> > > same point that Myth did when watching the file?
> > >
> > > Couple questions:
> > >
> > > Are you watching a pre-recorded program while another is recording?
> > >
> > > Does the problem happen if you pause LiveTV for a few minutes and then
> unpause
> > > it and continue watching?
> > >
> > > Are there any messages printed out in the window you ran mythfrontend
> from or
> > > on the backend?  How about the syslog, anything there from ivtv?
> > >
> > > I'm wondering if you're running into problems with reading/writing the
> mpeg2
> > > files at the same time or maybe dma problems or something.
> > >
> > > -- 
> > >
> > > Chris
> > >
> > -- 
> >
> > *<|:oþ
> > "Beware the Jabberwock, my son!
> > The jaws that bite, the claws that catch!
> > Beware the Jubjub bird, and shun
> > The frumious Bandersnatch!"
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> 
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-- 

*<|:oþ
"Beware the Jabberwock, my son!
The jaws that bite, the claws that catch!
Beware the Jubjub bird, and shun
The frumious Bandersnatch!"