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List:       linux-video
Subject:    Re: [video4linux] Alex: channels
From:       alexb () jetsuite ! com (Alex Bakaev)
Date:       1998-07-28 19:02:32
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Richard,

I don't know much about bttv driver. The driver I wrote for Win95 can
capture interlaced frames at variable frame rate up to 25, can capture
single field to memory while sending other field to overlay/primary.

Bt848 WDM driver ( source available on Win98 DDK ) can capture
interlaced, single or alternating fields at variable frame rate up to
50/60 ( PAL/NTSC ).

In addition VBI data can be captured at the same time too.

I think this should be implemented/speced for video4linux. Hopefully I
will start porting my driver soon...

Alex

Richard Guenther wrote:
> 
> On Mon, 27 Jul 1998, Bill Dirks wrote:
> 
> > Alex Bakaev wrote:
> >
> > > Thus a video channel must have the following capability flags: channel
> > > can capture odd field/even field/interlaced fields/alternating fields
> > >
> > > VIDCHAN_ODD   video channel can capture odd fields only
> > > VIDCHAN_EVEN  video channel can capture even fields only
> > > VIDCHAN_INTERLACED video channel can capture odd and even fields,
> > > interlacing them                    automatically
> > > VIDCHAN_ALTERNATING video channel can capture odd and even fields,
> > > alternating them
> 
> I've done some experiments with the bttv driver - it seems that it
> does _not_ support capturing ODD and/or EVEN or ALTERNATING frames??
> The maximum framerate I got was 25fps - from PAL I would expect
> 50!? Is the current bttv-code missing support for this, or did I
> simply not find it? (You know - the two cameras - one grabber
> problem...)
> 
> Richard.
> 
> --
> Richard Guenther <richard.guenther@student.uni-tuebingen.de>
> PGP: 2E829319 - 2F 83 FC 93 E9 E4 19 E2 93 7A 32 42 45 37 23 57
> WWW: http://www.anatom.uni-tuebingen.de/~richi/
> 
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