Grabbing 4:3 and 16:9
- Date: Tue, 26 Feb 2008 12:19:39 +0100
- From: Michel Bardiaux <mbardiaux@xxxxxxxxxxx>
- Subject: Grabbing 4:3 and 16:9
Our current systems use Hauppauge WinTV, dmesg as follows:
bttv1: Bt878 (rev 17) at 01:08.0, irq: 17, latency: 64, mmio: 0xf8001000
bttv1: detected: Hauppauge WinTV [card=10], PCI subsystem ID is 0070:13eb
bttv1: using: Hauppauge (bt878) [card=10,autodetected]
bttv1: Hauppauge/Voodoo msp34xx: reset line init [5]
tuner: chip found @ 0xc2
i2c-core.o: client [(tuner unset)] registered to adapter [bt848 #1](pos. 0).
i2c-core.o: adapter bt848 #1 registered as adapter 1.
bttv1: Hauppauge eeprom: model=44806, tuner=Temic 4046FM5 (22), radio=no
bttv1: using tuner=22
tuner: type set to 22 (Temic PAL/SECAM multi (4046 FM5))
bttv1: i2c: checking for MSP34xx @ 0x80... not found
bttv1: i2c: checking for TDA9875 @ 0xb0... not found
bttv1: i2c: checking for TDA7432 @ 0x8a... not found
bttv1: PLL: 28636363 => 35468950 .. ok
bttv1: registered device video1
bttv1: registered device vbi1
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.
What I would like to do is to capture the 16:9 broadcast without
letterboxing (and the 4:3 without horizontal padding!) simply by
changing the pixel aspect ratio stated in our MPEG files. And since we
do 24/7 captures, this has to be done on-the-fly, no reinitialization of
the cards or the software allowed. Which leads to 2 questions:
1. How do I sense from the software that the mode is currently 16:9 or 4:3?
2. How do I setup the bttv so that it does variable anamorphosis instead
of letterboxing? If that is at all possible of course...
I *am* googling for all that, but "16/9" is one of those queries on
which search engines are really really bad, like "date" or "thread" :-(
TIA,
--
Michel Bardiaux
R&D Director
T +32 [0] 2 790 29 41
F +32 [0] 2 790 29 02
E mailto:mbardiaux@xxxxxxxxxxx
Mediaxim NV/SA
Vorstlaan 191 Boulevard du Souverain
Brussel 1160 Bruxelles
http://www.mediaxim.com/
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