[mythtv-users] HDTV Output/Deinterlacing
doug at ties.org
Wed Dec 15 11:42:10 UTC 2004
> I've been following this list for sometime now, paying particular
> attention to those who are capturing/outputting HD
> I've seen a lot of posts from poeple telling others to turn on the
> deinterlacer, or that playback is better with the deinterlacer on.
> Given that the modelines I've seen are set to output 720p or 1080i,
> what are we deinterlacing for?
> Assuming that the TV supports inputs of 720p and 1080i, can't the
> original format just be passed straight to the TV?
> My thinking is (and I'm probably way off :) ) if the TV has a ATSC
> tuner, and both 1080i and 720p pictures look "as expected", there
> should be no loss in quality when feeding a 1080i or 720p input from a
> vieo card.
> What am I missing here?
This *should* in fact work just fine. Since 6111, nVidia drivers are
capable of outputting interlaced modes. Two problems:
* the minute you press that "W" button to scale vertically, your
interlaced lines no longer line up.
* I'm not convinced the nVidia Xv overlay is doing the right thing when
presented with interlaced video on interlaced output; it's hard to tell,
but I think it may be doing onefield deinterlacing, or something
approaching linearblend. Pausing some high-motion scene does not
produce flicker as it should. Normal (non-Xv) content seems to be
working fine, so it's gotta be some bug in the driver... if only we
could see the source :-(
Brad Templeton wrote:
> Many HDTVs only take 1080i. If they do take both, you would need Myth
> to switch to different modes depending on the recording being played. I
> don't know if it is smart enough to do that.
This has worked for a while. Settings->Appearance; 3rd screen or so,
"Separate video modes for GUI and TV playback." There's only room for 2
video modes here (plus a GUI mode) but IIRC you can enter more into the
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