[mythtv-users] PVR 250 Interlaced Playback issues on mythfrontend

[Joseph Kennedy]

Ok, I spoke with Billy Briggs, the author of tvtime, and he set me 
straight as far as interlaced output with an nvidia card goes.

There does not appear to be any way to definitively predict with field 
( top or bottom) will be drawn from card's buffer when you begin 
playing video...you can, through experimentation, make your best 
approximation as to when it will happen and time for it in a reasonable 
way, but that does not mean it will always be predictable, or that it 
cannot be "broken" through normal use like just playing or scrubbing 
the video.

The only consumer cards that appear to have interrupt field support for 
tv-out are the matrox G series and this has been hacked in through 
reverse engineering...I'm not even sure that it's complete...I'm still 
going to try though.

I'm not sure why it is that the fields appear to be out of order even 
when de-interlacing is enabled though...probably a result of the linear 
blending causing motion blur, or just the tv encoder chip not being 
geared towards outputting video per-say.

DISCLAIMER: I may have screwed up the explanation...lol

On Sunday, September 21, 2003, at 10:11 AM, Will Dormann wrote:
>
> I think I see this happening.    Especially when there is a "ticker" 
> at the
> bottom of the screen.  Sometimes it is relatively smooth, and somtimes 
> that
> very same ticker will be jumpy, as if the field order is reversed.
>
> But what I don't get is that I have the option to deinterlace the 
> video on
> playback enabled.    If that's the case, then the field order shouldn't
> make a bit of difference, right?   I would assume it's blending both 
> fields
> together.
>
> Anyone else?
>
>
>
> -WD
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