[mythtv] My ongoing quest for a stable bobdeint setup...

[Jason Weinstein]

I'm happy with the TV-out of my Pundit. I'm using S-video out and
though it's not quite as sharp as using my PVR-350's S-video out, I'm
happy with the image quality. I'm no longer using the PVR-350's video
out because I've got a HD-3000 and want to view ATSC content.

Jason


On Wed, 23 Feb 2005 22:41:13 +0100 (CET), Staffan Pettersson
<staffan.pettersson at sverige.nu> wrote:
> > My motivations in this context:
> >
> > - I want full field rate in video playback; to my knowledge, using
> > bobdeint is the only way to achieve this;
> > - bobdeint requires a form of vertical sync, which as far as I know the
> > SiS driver cannot support.
> >
> > In my ongoing quest to find an X setup that gives me jitter-free video
> > using bobdeint I stumbled upon a new option, found on the SiS X driver
> > website (http://www.winischhofer.at/linuxsispart1.shtml):
> > <http://www.winischhofer.at/linuxsispart1.shtml>
> >
> >> *2. Video blitter method*
> >>
> >> This second method is only supported on the SiS M650, 651, (M)661,
> >> (M)741, 330 and (M)760, not any older chipsets. It works entirely
> >> different to the overlay method: The video blitter simply copies video
> >> data from the video application into the framebuffer (eg. a window),
> >> thereby converting the data from the video color space (some YUV
> >> format) to RGB. All this is done by the 2D acceleration engine.
> >>
> >> The following color space formats are supported: YV12, I420, UYVY,
> >> YUY2, YVYU, NV12, NV21. The maximum video source size is 2046x2046.
> >>
> >> The video blitter is only very little slower than the Xv method.
> >> However, it's worst disadvantage is that it cannot scale the video.
> >> The video will always be shown in its original size; if the video is
> >> larger than the visible screen, it will be cropped. If it smaller, a
> >> black border will be drawn. Furthermore, there are no video properties
> >> such as contrast, brightness, etc.
> >>
> >
> > So, when I enable this as the video output, bobdeint starts acting like
> > it does when you give "bobdeint" as an argument to the "Custom Filters"
> > option in the Setup > Tv Settings > Playback menu; which is splitting
> > the screen horizontally in two halves, each displaying one field. Of
> > course, this is due to the fact that bobdeint only works on Xv or XvMC
> > output. Using this Video blitter method, the output comes from the
> > framebuffer, as stated above.
> >
> > My experience up till now has been that the combination of SiS + Xv +
> > bobdeint gives vertical jitter (now and then) because there is no
> > (driver or OpenGL) Vsync support. My question: can the source code of
> > either bobdeint or the the non-Xv video output (which one handles this?)
> > be modified to have the screen built up correctly, that is with the
> > fields interweaved and not split screen?
> >
> > Thanks,
> > -- Jeroen
> > _______________________________________________
> > mythtv-dev mailing list
> > mythtv-dev at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
> >
> 
> Hi
> 
> I struggled with an asus pundit to. tried tv-out, wasn't happy with
> picture quality, after that i build a vga to rgb converter, wasn't happy
> with that either. I spent several days trying diffrent modelines,
> interlace filters etc but the bottom line is that the sis 315 is a peace
> of sh**t!
> 
> Now i'm running a new system with a cheap Geforce MX400, and the picture
> quality and framerate when using xv + bob is almost better than my settop
> box!
> 
> So do i have a point?
> By new hardware, you will lose your mind trying different settings on the
> pundit!
> 
> /Staffan
> 
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