[mythtv-users] Playback vid corruption with HD NBC (1080i oramd64 related?)

Todd Bailey toddb at toddbailey.net
Wed Jun 15 14:17:16 UTC 2005

I remember reading something about this in Wilson's install guide.  you 
might want to check and see if various forms of filtering is turned off.
spatial and dnr come to mind

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----- Original Message ----- 
From: <gad at jetcom.org>
To: <mythtv-users at mythtv.org>
Sent: Wednesday, June 15, 2005 7:09 AM
Subject: Re: [mythtv-users] Playback vid corruption with HD NBC (1080i 
oramd64 related?)

> Quoting Ian Trider <iantri at gmail.com>:
>>> This is different than the problem that I have with the bob deint. With
>>> that the  SD stuff will shimmer. I haven't seen a fix for that one
>>> either.  I believe that is also amd64 related.
>> I don't know about the main problem you describe in your message, but
>> what you describe here is pretty much inherent in a bob deinterlace --
>> it takes each field of the original interlaced frame and blows it up
>> to full size, then plays the two one after another in time.
>> Because the two interlaced fields are in slightly different spatial
>> positions (i.e. the first field covers the odd scanlines, second field
>> covers the even scanlines) the image will wobble/jitter vertically
>> slightly. (That's why it's called 'bob' <g>)
>> There are strategies for reducing this, but I'm don't know if myth
>> implements them (using PVR-350 for output) -- if it is available for
>> realtime playback, though, kerneldeint should look nice, but the
>> motion won't be as 'smooth'.
>> I'm guessing this isn't really noticable in HD material because the
>> higher-resolution probably covers up for the bob effect.
> Comparing bob on a x86 machine to it on a amd64 machine. There is 
> definately something wrong with the amd64.  Shimmer was a bad word, it's 
> more like double vision or ghosting. It did not used to look like this.
> Is there a way to take screen shots in myth?  I'd love to provide pictures 
> of these effects.
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