On Friday 30 November 2007 06:23:11 Sam Logen wrote:
> Thank you for your reply. Do you think it would be
> worth checking if the firmware can properly embed the
> vbi data for these blackbird cards, or is that an
> inherent problem with the firmware itself? The cards
> do use the same firmware that IVTV packages.
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)
> > > >
> > > > So I downloaded the svn trunk, and built the
> > > > 'v4l2-ctl' utility. Please check the results
> >
> > below
> >
> > > > (Note the VBI sections).
> > > >
> > > > For my DViCO FusionHDTV5 RT card - capable of
> > > > displaying Closed Captioning in Mythtv
> > > >
> > > > ./v4l2-ctl --all -d /dev/v4l/video0
> > > > Driver Info:
> > > > Driver name : cx8800
> > > > Card type : DViCO FusionHDTV 5 Gold
> > > > Bus info : PCI:0000:04:08.0
> > > > Driver version: 6
> > > > Capabilities : 0x05010011
> > > > Video Capture
> > > > VBI Capture << Note this
> > > > Tuner
> > > > Read/Write
> > > > Streaming
> > > > Format Video Capture:
> > > > Width/Height : 320/240
> > > > Pixel Format : BGR3
> > > > Field : Interlaced
> > > > Bytes per Line: 960
> > > > Size Image : 230400
> > > > Colorspace : Unknown (00000000)
> > > > Format VBI Capture:
> > > > Sampling Rate : 28636363 Hz
> > > > Offset : 244 samples
> >
> > (8.52064e-06
> >
> > > > secs after leading edge)
> > > > Samples per Line: 2048
> > > > Sample Format : GREY
> > > > Start 1st Field : 10
> > > > Count 1st Field : 17
> > > > Start 2nd Field : 273
> > > > Count 2nd Field : 17
> > > > Video input : 0 (Television)
> > > > Frequency: 0 (0.000000 MHz)
> > > > Video Standard = 0x00001000
> > > > NTSC-M
> > > > Tuner:
> > > > Capabilities : 62.5 kHz
> > >
> > > multi-standard
> > >
> > > > Frequency range : 0.0 MHz -
> >
> > 268435455.9
> >
> > > > MHz
> > > > Signal strength : 0%
> > > > Current audio mode : mono
> > > > Available subchannels:
> > > >
> > > >
> > > >
> > > > For my Avermedia M150-D card - unable to view
> > >
> > > Closed
> > >
> > > > Captioning while card is in Hardware encoder
> >
> > mode.
> >
> > > > ./v4l2-ctl --all -d /dev/v4l/video2
> > > > Driver Info:
> > > > Driver name : cx88_blackbird
> > > > Card type : ASUS PVR-416
> > > > Bus info : PCI:0000:04:0a.2
> > > > Driver version: 6
> > > > Capabilities : 0x05010001
> > > > Video Capture
> > > > Tuner
> > >
> > > \> Read/Write
> > >
> > > > Streaming
> > > > Format Video Capture:
> > > > Width/Height : 720/480
> > > > Pixel Format : MPEG
> > > > Field : Interlaced
> > > > Bytes per Line: 0
> > > > Size Image : 0
> > > > Colorspace : Unknown (00000000)
> > > > Video input : 0 (Television)
> > > > Frequency: 7796 (487.250000 MHz)
> > > > Video Standard = 0x00003000
>
> === message truncated ===
>
>
>
>
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