Re: Grabbing 4:3 and 16:9

[Michel Bardiaux <mbardiaux@mediaxim.be>]

Alan Cox wrote:
> On Tue, Feb 26, 2008 at 05:40:27PM +0100, Michel Bardiaux wrote:
>> credits on the captured MPEGs). But Daniel wrote that the 16:9 analog 
>> broadcasts have only 432 lines, so the info is not there in the first 
>> place. So that effect isnt an option for me. But thanks anyway.
> 
> Per frame.... if you sample as it scrolls and line up the title tops I suspect
> most of the time you can get more samples as the title moves.
> 
Not crazy, I am *also* considering various image enhancement techniques, 
I just want to start from the best possible capture in the first place. 
That means capturing at 768(or more?) wide instead of 704; in YUV422P 
instead of YUV420P; avoiding reizing, and use better resizing 
algorithms. And capturing at 576 instead of 432 vertically would help too.

As I find more relevant pages, my question has now become: given a 
768x576 capture (by a BT878) can I check whether the PALPLUS is there? 
No use trying to implement the decoder in software if the signal simply 
isnt there!

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Michel Bardiaux
R&D Director
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Mediaxim NV/SA
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