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Help! 1080i or 720p looks horrible -- SDTV fine.
PostPosted: Sat Nov 01, 2003 5:08 pm Reply with quote
Joe
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1080i and 720p channels look great if the image is completely static but any motion looks terrible. SDTV looks normal.

I have a ATi radeon 8500, with a P4 2.8Ghz processor, using mplayer to play:
mplayer -vo gl2 /dev/dtv

I've found de-interlacing helps slightly but no where near acceptable:
mplayer -vo gl2 -vf pp=lb /dev/dtv

Any suggestions? I've wanted playback to look decent before I move on to trying to get mythtv working...

Thanks,
Joe
PostPosted: Sun Nov 02, 2003 9:57 am Reply with quote
elwood
 
Joined: 26 Sep 2003
Posts: 67
Location: Phoenix, AZ




For what its worth, I've found deinterlaced mythtv playback far exceeds mplayer's, at least with the filter settings I've tried.

I'd recommend moving ahead, and using mplayer just as a test of signal strength.

Brad
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PostPosted: Mon Nov 03, 2003 2:21 pm Reply with quote
Scott Larson
 
Joined: 15 Oct 2003
Posts: 713
Location: Portland, OR




You can try another deinterlace filter option "-vf lavcdeint".
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improving bad video
PostPosted: Sat Feb 28, 2004 5:42 am Reply with quote
inkling
 
Joined: 05 Feb 2004
Posts: 342




I don't have my 21" monitor yet, so I can't run 1920x1088, interlaced or otherwise.

For 1920x1088i, I use 960x544@59.94Hz (well, as close as xvidtune would let me get it to 59.94.)

All the wavy lines in xine-hd disappear then. Go full screen at say 1024x768@85Hz and wavy lines come back, since it's not exactly 1/4 size anymore, and the framerate doesn't match.

Go full screen at 960x544@59.94Hz and it's brighter than usual, wavy vertical line free, unnoticable horizontal deinterlace artifacts, and pans seem less jerky, too. It's brighter because guns are concentrated in a smaller area.

The xine deinterlacer is too slow, so I thought of another way around the problem. What if I match *ALL* ATSC framerates to monitor framerates as close as possible?

So I spent a while in xvidtune and made up a bunch of modelines that work on my monitor, to give me 960x544 mode, 704x480 mode, 1280x720 mode (ABC only one using that here) at 60hz and 29.97.

There seems to be an odd mix of 704x480 at 60 and 29.97, but the other resolutions seem to stay fixed in framerate, e.g. 1920x1088i always 29.97, 1280x720 always 60. At least from my limited sample here.

I tried 960x540 but it didn't look quite right, still some wave in the vertical lines.

1024x768x85 hz gives 960x544 in a window OK, but instead of wavy vertical lines you get what you usually expect deinterlace artifacts to look like, e.g. the horizontal stairstep smudging on the edges during pans.

Good luck with tuning your video modes. It can be a quite tedious and boring process, but the result should be well worth the tedium.

Oh yeah, don't fry your monitor. Check your monitor specs, i.e. all of the maximum freqs for each resolution and don't go past them unless you want to buy a new monitor sooner than you should have to.

-ink
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Help! 1080i or 720p looks horrible -- SDTV fine.
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