On Thu, 07 Jun 2007 01:27:49 -0700, duncan.perrett wrote:

> I have a Frame grabber based on the Conexant Fusion 878A (bt848, bt878
> compatible).
>
> I want to capture still frames from the analog video input. I read the
> data sheet and it mentions "VBI Frame Output Mode". It says this mode
> is designed for use with still frame capture/processing applications ...
> This feature can be used to provide a high quality still-capture of
> video."
>
> Does anyone know about this mode. I can't find any more information on
> it anywhere. I have studied the Linux kernel's bttv driver and Video 4
> Linux Two API (VFL2) which mentions a VBI Capture mode. They also
> distinguish between 'Raw VBI' and 'Sliced VBI'.
>
> I realize VBI is traditionally used for RDS and Teletext etc, but the
> 878A data sheet says ...
> In addition, the Fusion 878A supports a VBI Frame Output Mode in
> which every line in the video frame is treated
> as if it were a VBI line ... and ...
> In the VBI frame output mode, VBI data capture occurs in the
> active video region and includes all the horizontal
> blank/sync information in the data stream.
>
> Can anyone offer any explanations or links to help me write a Linux
> style device driver for my frame grabber board?
>
> Thanks

Hello,
you should ask this question on the v4l mailing-list (see http://
www.linuxtv.org/v4lwiki/index.php/Main_Page).
You will have answers from the driver developers that know the BT878
internals.
Regards,
Thierry