[AG-TECH] BTTV Capture & Mpeg / Large Video Size

[Douglas Kosovic]

Hi,

Looks like vic's V4L2 'large' only works with 4:3 704x576 PAL input sources, in the past the bttv driver would put a black border around a 704x480 NTSC source, but now when vic requests it, it doesn't succussed, vic's debug output:

  V4L2: failed to set format! requested 704x576, got 704x480

I think I'll try and do a variation of Claus's patch (which doesn't work with common UVC webcams that use 16:9 resolutions), so that it selects the nearest working resolution to 704x576.


Cheers,
Doug

> Claus Endres wrote:
> 
> You might want to try the attached patch. It works for me for
> webcams with NTSC resolution.
> 
> Please let me know if it solves your problem.
> 
> Regards,
> Claus.
> 
> Todd Zimmerman wrote:
> > Hey All,
> >
> > Not sure if it is a local configuration/driver issue or not, but I am
> > having problems producing 'large' video sizes using my BTTV capture
> > card. It's a WinTV PCI card with a Sony handycam plugged into the
> > s-video input.
> >
> > I'm using vic-2.8ucl1.4.0beta
> >
> > Here are my settings::
> >
> > V4L2 (BT878), SVideo, NTSC, Mpeg4, Large.  When I select 'Transmit',
> > the stream 'info' still only indicates 352x288.   If I change the
> > Signal to Auto (or PAL or SECAM) the picture goes green/pink but the
> > resolution moves to 704x576.
> >
> > Is it _actually_ producing a larger video but the indication is
> > wrong, or is it not capable of going above 352x288??
> >
> > I'd test V4L, but for some reason vic indicates it cannot open the
> > device when trying to switch to v4l.
> >
> >
> > Any thoughts?
> >
> > Todd