[mythtv] [PATCH] viavld interlaced patch

[Terry Barnaby]

Robert Clark wrote:

>On Sat, 2004-10-02 at 11:08, Terry Barnaby wrote:
>
>  
>
>>Ivor Hewitt wrote:
>>
>>    
>>
>>>Minor patch to fix the interlace logic in the xvmc-vld code.
>>>      
>>>
>
>  
>
>>Thanks for that patch Ivor, I notice that Robert Clark has seen issues with
>>interlace as well and I am not yet happy with the quality when motion
>>is present.
>>    
>>
>
>  I've had another look at this and I am now seeing evidence of
>interlacing (flickering when paused during motion). Bizarrely, this is
>only happening some of the time, though, so I think it's not 100%
>correct yet. One thing that did cross my mind was that perhaps only some
>frames (I-frames?) are being decoded properly. Unfortunately, I don't
>know enough about MPEG compression or how the CLE266 accelerates it to
>be much help.
>
>  I'm in the middle of rebuilding everything on my Myth box from the
>ground up with the latest versions of drm, X drivers and MythTV before I
>look into this further. I'll be very interested (and grateful!) to see
>if Ivor's patch sorts this out when I'm finished.
>
>  One thing which you've probably already checked is scaling. I had
>great difficulty convincing MythTV not to scale the image and any
>vertical scaling destroys the interlacing. Eventually I gave up and
>patched it to hardcode the display aspect to match the source.
>
>	Robert
>  
>
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>
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>  
>
One thing on this, what is your MythTv setup ?
I presume you are using a PAL/NTSC TV as an output device ?
If you are using, as I am, a Via M10000 box that includes the VT1622
TV output chip (or similar), this has a "de-flicker" option which is enabled
by default in the Unichrome Via X driver. This "de-flicker" filter has 
some level
of adaptive functionality depending on the picture content. This will
actually remove the interlacing to a fair degree and thus also reduce 
vertical
resolution.
For watching Video I have turned it off with a hard hack (patch enclosed).

What is your video source to get the interlaced pictures ?

Terry
 
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