From: "Daniel Glöckner" <daniel-gl@gmx.net>
To: Michel Bardiaux <mbardiaux@mediaxim.be>
Cc: video4linux-list@redhat.com
Subject: Re: Grabbing 4:3 and 16:9
Date: Tue, 26 Feb 2008 14:02:00 +0100 [thread overview]
Message-ID: <20080226130200.GA215@daniel.bse> (raw)
In-Reply-To: <47C3F5CB.1010707@mediaxim.be>
On Tue, Feb 26, 2008 at 12:19:39PM +0100, Michel Bardiaux wrote:
> Here in Belgium the broadcasts is sometimes 4:3, sometimes 16:9.
> Currently, the card goes automatically in letterbox mode when it
> receives 16:9, and our software captures the 4:3 frames at size 704x576.
The card does not go into letterbox mode. It's the broadcaster who
squeezes the 16:9 picture into 432 lines surrounded by 144 black lines.
Some fill the chroma part of the black lines with a PALPlus helper
signal. Although the algorithms to decode PALPlus are well documented in
ETS 300 731, I have never seen a software implementation.
> 1. How do I sense from the software that the mode is currently 16:9 or 4:3?
Some broadcasters use WSS to signal 16:9.
In Germany some signal 4:3 even on 16:9 shows.
Read ETSI EN 300 294.
> 2. How do I setup the bttv so that it does variable anamorphosis instead
> of letterboxing? If that is at all possible of course...
You can't. Bttv can't stretch vertically.
Daniel
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next prev parent reply other threads:[~2008-02-26 13:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 11:19 Grabbing 4:3 and 16:9 Michel Bardiaux
2008-02-26 13:02 ` Daniel Glöckner [this message]
2008-02-26 13:38 ` Alan Cox
2008-02-26 16:40 ` Michel Bardiaux
2008-02-26 17:02 ` Alan Cox
2008-02-26 17:12 ` Michel Bardiaux
2008-02-26 17:17 ` Michel Bardiaux
2008-02-26 17:24 ` Alan Cox
2008-02-26 18:32 ` Daniel Glöckner
2008-02-26 16:55 ` Michel Bardiaux
2008-02-26 17:15 ` Hans Verkuil
2008-02-28 14:12 ` Michel Bardiaux
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