[mythtv-users] OT: HDTV artifacts/waviness

[John Sturgeon]

Doug Larrick wrote:

> John Sturgeon wrote:
>
>> Some of the HDTV (1920x1080i) content I have has strange waviness 
>> during motion.  It creates what I guess I could best describe as a 
>> 'fat' interlaced picture.  You can see a screen shot here: 
>> http://www.sturgeonfamily.com/images/screenshot.php  I have tried 
>> various deinterlacing filters, but none have any effect.  I'm 
>> guessing I'm missing something really basic here.
>
>
> I'd guess you're using XvMC?  The deinterlacing filters don't work at 
> all for XvMC.
>
> If you're not using XvMC, double-check that the normal deinterlacing 
> filter doesn't remove it.  This effect is exactly what I see if I feed 
> an interlaced frame to my 1920x540p (or 960x540p) output.  I think 
> it's the hardware scaling algorithms not doing a very good job with 
> the interlaced picture.
>
> If you're actually using an interlaced output mode (1080i), you're 
> beyond my experience.
>
> -Doug
>
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I'm not using XvMC (for the de-interlacing reason), and my modeline from 
XF86Config is:
       ModeLine     "888x508in540p" 37.3 888 944 1048 1104 508 534 548 
563 +hsync +vsync

Basically, I record the HDTV content to a .nuv file, use ProjectX to 
demux the video from the audio, and use transcode to convert the whole 
thing to xvid4.  I'm beginning to think that it might be a 3:2 pulldown 
issue introduced by scaling 480i up to 1080i

--
John <><