[mythtv-users] Commercial Flagging, what are the best
kuphal at dls.net
Wed Dec 21 15:06:18 EST 2005
Kevin Kuphal wrote:
> David Rudder wrote:
>> This is a pretty off-the-wall suggestion. Is there anyway to detect
>> V-Chip signals? I know within the US, all broadcast and cable shows
>> have a V-Chip signal, but it's turned off during commercials. This
>> would be a 100% reliable way of detecting commercials, but I have no
>> clue whether the signal could be picked up by myth.
>> I would be ironic to have something good come out of V-Chip, eh?
> Upon further investigation, it seems like it would be trivial to
> extract the information into Myth using the IVTV VBI support. Right
> now Myth will extract the CC information out of field one of line 21
> (see line 1634 for avformatdecoder.cpp). The XDS information is
> stored in field two of that line. I think using buf and buf
> would yield the XDS packet V-chip packet based on the information in
> the other link I posted.
> Decoding that is easy based on the documentation and then it is just a
> matter of passing that into the right structure that the commercial
> detector can use. I may have to see about getting my PVR-150 to
> decode VBI/CC packets and see if mabe I can get this to work...
In looking further, recent SVN changes have the skeleton for XDS parsing
but nothing is done with the data. My PVR-150 is putting data into
/dev/vbi so I think my backend is set up for capturing. This may be my
Christmas project to see if I can properly decode the XDS V-chip
information at least in debugging output to see what it says.
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