[MPlayer-users] vsync and nvidia (was: [BUG] -vf tfields=4 jumpiness -- OSD flickers madly)

[D Richard Felker III]

On Mon, Nov 03, 2003 at 09:29:46PM -0500, Jason Tackaberry wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Mon, 2003-11-03 at 20:21, D Richard Felker III wrote:
> > MPlayer does not support framerate-increasing filters. The tfields
> > filter only works for encoding, and even then it's a big hack
> > involving setting the incorrect framerate. :)
> 
> I guess that explains that. :)
> 
> There may be a better fix for my real problem, anyway.  The WinTV
> PVR-250 outputs a 29.97 fps interlaced mpeg2.  The problem is that when
> I play this back through TV out (NVidia GF4 MX 440, using nvidia's
> closed driver, no monitor connected) it looks terrible.
> 
> I've been reading the archives and doing various google searches, and
> from what I've seen this seems to be a vsync issue.  When I leave CNN on
> and just watch the scrolling marquee, it's regularly jerky and the
> lettering jaggy, but every now and then things seem to click into place
> for a moment and it looks smooth.
> 
> Everyone seems to be extolling the virtues of the Matrox G400 for this
> sort of thing, but I'd love to salvage my existing nvidia card since
> it's not a terrible card otherwise.
> 
> I feel a bit out of my element here and would definitely welcome some
> hints.  I tried for a bit to get the nvidia vidix driver working, but
> had problems (wouldn't detect the card and it seems that the PCI bus
> scanning code doesn't work on my system).  But if in fact my problem is
> vsync and the nvidia vidix driver will fix that, then I'll spend some
> time to make it work.  Perhaps there are other options?

My first hint is to make absolutely sure that no scaling is going on.
Your video mode MUST be 480-lines (so 640x480 would be a good choice)
or you'll trash the interlacing. Also, the tvout needs to be on the
primary head, or you'll get tearing, which will be extremely bad with
interlacing. If you fix these two things, I think it should work
great.

Rich