On Friday 30 November 2007 11:38:07 Sam Logen wrote:
> Ok, thanks. By the way, when you mention the cx23883
> chip, do you also mean its predecessors, the
> cx23882/1/0?
Yes. The datasheet is for the cx23880/1/2/3.
Regards,
Hans
>
> Sam
>
> --- Hans Verkuil <[EMAIL PROTECTED]> wrote:
> > It's inherent to the firmware. And even if it could
> > it wouldn't help you
> > since the cx23883 does not support sliced VBI which
> > is a prerequisite
> > to embedding VBI in the MPEG stream.
> >
> > In other words, it's a no go.
> >
> > Regards,
> >
> > Hans
> >
> > > Anyway, I'll pass along your thoughts to the
> >
> > others
> >
> > > in the mailing list.
> > >
> > > Thanks again,
> > > Sam
> > >
> > > --- Hans Verkuil <[EMAIL PROTECTED]> wrote:
> > > > On Thursday 29 November 2007 03:08:42 Sam Logen
> > > >
> > > > wrote:
> > > > > Hi everyone. I've been communicating through
> >
> > the
> >
> > > > V4L
> > > >
> > > > > mailing lists about getting VBI support
> >
> > through
> >
> > > > the
> > > >
> > > > > hardware encoder of cx88 blackbird devices. I
> > > >
> > > > learned
> > > >
> > > > > that there is no such support, and I'm
> >
> > wondering
> >
> > > > what
> > > >
> > > > > the current status is for VBI support in the
> >
> > IVTV
> >
> > > > > drivers.
> > > > >
> > > > > I've read from posts dated back to 2005 that
> >
> > there
> >
> > > > is
> > > >
> > > > > unreliable support for VBI in hardware cards
> >
> > such
> >
> > > > as
> > > >
> > > > > the pvr 350. I'm wondering if the process
> >
> > that
> >
> > > > you've
> > > >
> > > > > used to get support would work for cx88
> >
> > blackbird
> >
> > > > > devices.
> > > > >
> > > > > I determined that support didn't exist for
> > > >
> > > > embedding
> > > >
> > > > > VBI in the stream of cx88-blackbird devices
> >
> > with
> >
> > > > your
> > > >
> > > > > v4l2-ctl program. When I used the same steps
> >
> > as
> >
> > > > was
> > > >
> > > > > described here:
>
> http://www.gossamer-threads.com/lists/ivtv/devel/37060?page=last
>
> > > > > I learned that "stream_vbi_format" only
> >
> > accepts a
> >
> > > > > value of "0"
> > > >
> > > > Hi Sam,
> > > >
> > > > Basically the current state of VBI support is
> >
> > 100%
> >
> > > > for raw VBI and
> > > > partial success for sliced VBI (I intend to try
> >
> > and
> >
> > > > fix that, but I
> > > > need to finish other projects first before I can
> > > > continue with that.
> > > > It's not an easy job).
> > > >
> > > > The problem is that to get VBI support working
> >
> > with
> >
> > > > MPEG cards you need
> > > > to have a close interaction between the video
> > > > digitizer chip and the
> > > > MPEG encoding chip. And this is quite
> >
> > complicated to
> >
> > > > get right.
> > > >
> > > > In order to get sliced VBI to work you need a
> > > > digitizer that can decode
> > > > the VBI data from the input signal. I have
> >
> > already
> >
> > > > seen that the
> > > > cx23883 does not support that, so that means
> >
> > that it
> >
> > > > will never be
> > > > possible to embed VBI data into an MPEG stream
> > > > unless you do it on the
> > > > application side. But while doable that is still
> >
> > a
> >
> > > > major project (get
> > > > and decode the raw VBI data, parsing the MPEG
> >
> > stream
> >
> > > > and splicing the
> > > > decoded VBI data into the stream).
> > > >
> > > > Note that embedded VBI support is sort of a hack
> >
> > in
> >
> > > > ivtv as well.
> > > > Officially the cx23416 firmware is supposed to
> >
> > be
> >
> > > > able to handle that,
> > > > unfortunately the firmware delivers a corrupt
> >
> > MPEG
> >
> > > > stream if you try
> > > > that. It simply never worked. So instead I take
> >
> > the
> >
> > > > sliced VBI output
> > > > and splice it into the MPEG stream. It's in a
> >
> > custom
> >
> > > > format, so
> > > > standard MPEG playback devices will just ignore
> >
> > it.
> >
> > > > Raw VBI is supported by the cx23883, but I
> >
> > really do
> >
> > > > not know if it is
> > > > possible to get out both a raw VBI stream and a
> > > > compressed MPEG stream.
> > > > You need to talk to a blackbird expert (Mike
> >
> > Krufky
> >
> > > > comes to mind) to
> > > > see whether this is possible. With ivtv it is
> > > > possible to get multiple
> > > > streams (e.g. MPEG, raw YUV, raw VBI) out of the
> > > > cx23416, but I'm not
> > > > sure whether that is possible as well with the
> > > > blackbird design. As an
> > > > alternative, raw VBI might come directly from
> >
> > the
> >
> > > > cx23883 and the raw
> > > > video is passed through the cx23416. Again, no
> >
> > idea
> >
> > > > what is feasible
> > > > without doing a lot more research.
> > > >
> > > > Hope this helps,
> > > >
> > > > Hans
> > > >
> > > > > I'll include past emails below for review. I
> >
> > know
> >
> > > > > it's a lot of reading. Sorry.
> > > > >
> > > > > Thank you very much,
> > > > > Sam Logen
> > > > >
> > > > > Sam Logen wrote:
> > > > > > I came across directions for querying all
> > > >
> > > > available
> > > >
> > > > > > info from PVR cards with the utility
> >
> > 'v4l2-ctl'
> >
> > > > from
> > > >
> > > > > > the ivtv driver package.
> > > > > >
> > > > > > (By the way, this is all NTSC, USA)
>
> === message truncated ===
>
>
>
>
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