[mythtv-users] deinterlacing and non-smooth playback at 1080i

Mark Kendall mark.kendall at gmail.com
Mon May 21 19:54:51 UTC 2007


On 5/20/07, Seth Daniel <mythtv.org at sethdaniel.org> wrote:
> On Sun, May 20, 2007 at 10:00:43AM +0200, Mario Minati wrote:
> > Seth Daniel schrieb:
> Good thought.  However, the nvidia driver doesn't handle sending 1080i
> content to a 1080i resolution very well at all.  So you have to
> deinterlace to have any hope of a decent picture (or such is my
> understanding).
>
> http://www.nvnews.net/vbulletin/showthread.php?t=90959
> http://www.nvnews.net/vbulletin/showthread.php?t=91471
> (...and others...)

I'm fairly sure that deinterlacing 1080i content displayed at 1080i is
just treating the symptoms and not the cause i.e. it gives you
consistently 'mediocre' output quality rather than inconsistently
good/bad quality.

For what it's worth, I'd try:-

 -  turning off deinterlacing. You're only complicating the issue.
 -  force the video scan to interlaced in the on screen menu. You have
a 1080i stream that contains frames reported as progressive which
caused deinterlacing to alternate on and off - although turning off
deinterlacing should resolve it anyway.

If all is well, you'll now have perfect playback.

More likely, you'll have playback that is sometimes good/sometimes bad
and alternates between the two. If its bad, pausing will sometimes fix
it and visa-versa but it will probably switch between the two almost
randomly anyway.

Does that describe what you're seeing? Best to test with a
clip/channel with a news ticker moving from right to left.

Mark


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