[mythtv-users] VGA -SCART and interlace (2x)

[Paul Gardiner]

John wrote:
> Paul Gardiner wrote:
>> John wrote:
>>> Paul Gardiner wrote:
>>>> John wrote:
>>>>> Thanks for the reply.  What I was doing was moving between 
>>>>> autodetect, interlaced and progressive under the menu. The picture 
>>>>> looks the same with interlace (x2) and Progressive (no -interlacer 
>>>>> ) set. Same affect when I choose none as the interlacer under the 
>>>>> TV settings menu.
>>>>>
>>>>> Looks like I need another graphics card,
>>>>
>>>> I don't think you've quite got the point I was making. 
>>> You too :-)
>>>
>>> What I see is perfect "still" quality. The problem is interlacing 
>>> artefact's on  movement, just as you have clearly described. What I 
>>> was trying to say was that there was absolutely no reduction in 
>>> interlacing artefact's between interlaced 2x, and none. So doubling 
>>> the field rate, and repeating the fields does not lead to a constant 
>>> synchronization between recorded and displayed interlacing.  The 
>>> effect is disconcerting, and is clearly noticable on all scene 
>>> changes, as well as movement.
>>>
>>> VGA to scart gives excellent quality, and the quality is also 
>>> acceptable on movement using high quality deinterlacers, but the 
>>> whole point is that we shouldn't need to de-interlace to display it :-)
>>
>> Ok, that makes more sense now I understand what you are seeing. You
>> need to get "none" working intermittently well before using 
>> "Interlaced x2".
>>
>> Do you see clear fine-lined combs, or a strange larger-scale sine-wave
>> type pattern on the edge of moving objects?
>>
>> P.
>>
>>
> 
> I see "strange larger-scale sine-wave type pattern on the edge of moving 
> objects"  ..... is there hope for me Doctor ;-)

Oh yes! :-) That's great news. That's what I see if for any reason the
video is scaled. One possibility is if you are scaling the menu to
counteract overscan; it's ok to do so, but you need to uncheck the
setting "Scale video to match GUI" (or something like that). Or
maybe you aren't getting a 720x576 mode (I'd guess that wasn't
the problem because you'd see it in the logs). Can't think of any other
reason at the moment, but any scaling in the vertical will cause those
funny sine curves, and also stop "Interlaced x2" from working (although
yadif will be fine).

Cheers,
	Paul.