[mythtv-users] mpeg2 playback quality captured with PVR-150

[Chandi]

John,

 

Thanks a lot.

 

I've just found out today what the exact problem was.

 

I was never really playing the captured mpegs at their exact resolution. I
was recording at 720x480 but playing them at 720x480 through DVI on my tv
(but myth was set at something like 700x460 because the outer parts don't
show on the screen). The quality increased significantly only by doing that.


Now I'm only missing a few pixels of the picture but at least it's clear.

 

I only have to find a way to remove the noise from my 2 channels that gets
the bars. But that's a cable signal problem, not a mythtv one.

 

Thanks a lot again,

 

Chandi

  _____  

> Date: Thu, 11 Oct 2007 23:06:09 -0400
> From: drescherjm at gmail.com
> To: mythtv-users at mythtv.org; burni13 at hotmail.com
> Subject: Re: [mythtv-users] mpeg2 playback quality captured with PVR-150
> 
> > I couldn't make a screenshot with gentoo... I get blue-screens only ;)
> >
> > I have made 2 small clips of 2.8mb each.
> > They are available from my server :
> >
> > http://www.cequisepasseenregion.com/weather.mpg
> > http://www.cequisepasseenregion.com/weather2.mpg
> >
> Chandi,
> After looking at your examples I noticed I had the exact same effect
> on one of my tuners when I viewed the stream directly with mplayer. I
> watched them with the following command:
> 
> PVR250:
> mplayer /dev/v4l/video0
> 
> PVR150:
> mplayer /dev/v4l/video1
> 
> I also saw diagonal lines as you describe as well. With ivtv-tune I
> tuned my PVR250 and PVR150 to a news broadcast to get the weather and
> I had the same problem on the PVR150 as you describe but the PVR250
> had a perfect picture. I checked my cables and nothing was wrong. I
> did notice something though. The PVR150 was for some reason set at
> 480x480 while the PVR250 was at 720x480. So then I set the PVR150 to
> 720x480 and the picture was now very good on the PVR150. I did this
> using:
> 
> v4l2-ctl --set-fmt-video=width=720,height=480 /dev/video1
> 
> I do not have a lot of time to investigate this but I believe this
> will help. Can you do some testing at 720x480 capture resolution using
> the commands above.
> 
> John

 

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