Re: Grabbing 4:3 and 16:9

[Michel Bardiaux <mbardiaux@mediaxim.be>]

Michel Bardiaux wrote:
> 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!
> 
Explained here:

http://en.wikipedia.org/wiki/Widescreen_signaling

Now how to get at that info? zvbi/libzvbi?

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Michel Bardiaux
R&D Director
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