[mythtv-users] New deinterlacer for perfect image quality when using an interlaced display, mode that matches the source

[Paul Gardiner]

Tom Dexter wrote:
> On Wed, Apr 8, 2009 at 5:30 AM, Paul Gardiner <lists at glidos.net> wrote:
>> Jean-Yves Avenard wrote:
>>> Hi
>>>
>>> 2009/4/8 Jean-Yves Avenard <jyavenard at gmail.com>:
>>>> Where can I find this field-order no-flicker patch ?
>>>>
>>> Ooops, I see that you submitted it with the 6391 ticket.
>>>
>>> Any chance that you will adapt those OSD fixes on your backport of Mark's
>>> patch
>> I believe You can take the backport of Mark's patch,
>> mythtv-0.21-field-order.6.patch, as is. The two things I fix in
>> mythtv-0.21-field-order-no-flicker.patch, Mark already fixed in what he
>> comitted to trunk. The no-flicker patch was just my playing catch up,
>> in case Tom continued to have problems with mythtv-0.21-field-order.6.patch.
>>
>> Cheers,
>>        Paul.
>>
> 
> Believe it or not, I have an episode of Medium (NBC) from Monday night
> that's not cooperating well with the deinterlacer (in this case the
> mythtv-0.21-field-order.6.patch version).  It the same thing I saw on
> that ER episode.  It's not so much tearing as odd, almost slightly
> jerky motion...almost like when a show intensionally uses special
> effects to create that sort of choppy/jumpy motion, but not that
> pronounced.

Why Medium?! If they are going to mess things up, at least pick some
rubbishy program that no one will care about!! I've recently discovered
Medium. Watching the first series and loving it.

> This time my wife was able to see it for sure this time.  I can almost
> guarantee these issues are related to the manner in which NBC mixes
> progressive frames into their 1080i stuff.  If that's the case, I have
> a feeling it will do the same with all versions of the
> deinterlacer...unless for some reason, it only occurs only with that
> OSD flicker fix.  I saved the show and will try it with both other
> versions when I get a chance.  I'm unclear as to why it on;y seems to
> happen with specific programs...perhaps it depends on the amount of
> progressive frames.

Could it be that the content is just hard enough to decode that MythTv
is dropping a few frames. Interlaced x2 will look awful if frames are
being dropped. You'll sometimes see motion taking backward steps. I
guess another possibility is that the content truly has bad motion,
and the better resolution you are getting with Interlaced x2 is making
the problem show more than Bob does. Next episode, you could try your
commercial decoder.

> It's an elusive issue though.  You can see the odd motion plainly on
> part of a show, but jump back to the same place and have it work
> fine...really annoying.  I also noticed that the show in general just
> doesn't look that good...not as good as my 720p recordings and nowhere
> near the 1080i stuff like, for example, PBS, which looks perfect.

That does sound like they've done a bad conversion.

Cheers,
	Paul.