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

[Joseph Kennedy]

Well, first I should probably spell Billy Bigg's name properly.

For the g400, the only way to allow for proper interlaced video is to 
use the patched DirectFB within an app that is aware of it...so if 
someone wants to give Myth DirectFB support for the proper interrupts 
you could then get synched interlaced tv...at least this is my 
understanding.

PVR350 decoding and tv out has  progressed, and unlike the Dxr3 cards, 
can support the myth gui and X.  I was told that it is definitely not 
ready for release though...I think tmk said he got it to work fully as 
of this morning...lol...this might be the best option for everyone when 
it's complete....I'm not sure how it handles video to sync with a tv.

Maybe most people use half size video and bypass any interlacing issues 
that might exist...I tried this with my PVR250 and it looked like crap, 
but would probably look ok with a bttv card.

If I use nvtv to set flicker to 0, set horizontal and vertical overscan 
and displacement to 0 in myth, then pre-buffer the stream until I can 
visually bring the video into sync, my Geforce3 with BT869 tv encoder 
will display broadcast quality tv exactly as I see it regularly with no 
degradation in quality whatsoever.  After about 5 minutes the field 
order will change. Turning on De-interlacing brings mice teeth, blurry 
motion, and overall frame blurring.

Chutt dislikes me:(

I'm not a jerk IRL, but I type like one on IRC...lol

The tvtime de-interlacers in xine look very good, and would probably 
eliminate the issues I am seeing when turning on de-interlacing...the 
59.94 fps wouldn't hurt either;D  I don't know how hard they would be 
to bring to myth.

There was a patch introduced by Richard Jones  in late May which gave 
myth different de-interlacers of varying qualities.  He said that they 
were not as good as tvtime's (and that tvtime took more care to get the 
timings right) but they were better quality-wise than the linear blend 
that is built-in.  At some point they were removed...Richard said they 
were only half done, and required you to restart the frontend for 
changes to take effect.

Just some observations and things I've seen, heard, read, 
misinterpreted,etc..  If anyone could please comment on their own 
setups and experiences, I would appreciate it.  Feel free to correct me 
wherever needed.

Thanks!
--Joe

On Wednesday, September 24, 2003, at 06:46 PM, Brendan Kelly wrote:

>
>
> Joe did you find anything out?  Thanks for digging into this problem.
>
>
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