AW: AW: [mythtv-users] Hardware for Best TV-Out?

Flo Kohlert flokohlert at muenchen-mail.de
Mon Oct 25 23:38:09 UTC 2004


> Betreff: Re: AW: [mythtv-users] Hardware for Best TV-Out?
> 
> > Im currently using a gf4mx with a selfmade vga2rgb converter
> > (http://www.nexusuk.org/projects/vga2scart/) which is giving me uber-
> superb
> > quality on the frontend and good quality @watching recordings. Im still
> > investigating the cause for the notso sharpenes off my
> recordings/livetv.
> 
>  	I "discovered" that when I got my equivalent NTSC circuit built.
> I built up some test patters and convinced myself that the PVR-250 itself
> was limiting the capture resolution to about 520x480 maximum.  Anything
> over that produced no better resolution on even a static image.  I know it
> wasn't the TVOUT because of trying the test patterns directly (720x480 and
> 1440x480).  Here's the beta-quality DVD image I came up with at the time:
> http://www.ee.vt.edu/~mythtv/
>  	Be warned though, I've never actually tried the PAL stuff on
> anything... just changed the resolution of some pictures and re-authored
> the images.
> 
> > It seems to me that there aint no interlaced output if I watch
> > tv/recordings, although I dont get as heavy stuttering on the cnnticker
> as
> > I had on svideo out of the card. Ill try to throw some official
> > testpatterns on it via mpeg and mythgallery maybe I can then clearly
> > describe the problem.
> 
>  	I ended up adding deinterlacing to my recordings because I would
> get some strange beat frequency/vsync-related tearing without it.  I'm
> currently using KernelDeint and have been quite satisfied.  Bob deint is a
> bit much for the PIII-800 hardware.
> >
> > Maybe anyone can help me here as I clearly have interlaced output on the
> > frontend. Whats the difference between frontend output and watchingtv -
> > output? It even seems to look better in the video epg. XV, OpenGL vsync
> > should I try to compile without one/both of these (I think I wont get
> any
> > reasonable output on my p3-700 without xv)?
> > I have no deinterlace or any other filters activated, playback is full
> pal
> > resolution 720x576 my x resolution thats put on my tv is 768x576
> (shouldt
> > that be right due to square/non square pixel issues?). So can anyone
> > describe me the difference between frontend and movie-watching please?
> > Thanks
> > Flo
> 
>  	It depends on what you mean by "better."  If you are talking about
> vertical tearing on recordings, I solved that with the deint.  The
> softness of the capture I traced to the PVR-250 itself.  If it's any
> consolation, the three BTTV-based cards I've tried have all crapped out at
> about 400x480, max.  Anything over that takes space but doesn't help
> pictures quality.
> 
> Hope that helps... see if you can quantify your quality problems.
> 
> -Cory


Thx, ill try these and some official avid testpatterns later on.

Flo




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