[vdr] Freeview Playback

Andrew Herron totallymaxed at gmail.com
Fri Jun 15 14:04:48 CEST 2007


Great Stuff. My understanding was that this data was generally available for
the main UK channels.

On 6/15/07, Dave P <vdr at pickles.me.uk> wrote:
>
> On Friday 15 Jun 2007, Jonathan McDowell wrote:
> > On 12/06/07, Alex Stansfield <mailing-lists at jinkies.net> wrote:
> > > If anyone knows any more about how the system works or has the DTG
> > > specification (can't see it on their website) please let me know.
> >
> > MythTV seems to have added support:
> >
> > http://svn.mythtv.org/trac/ticket/2811
>
> Hmmm. I worked out the scheme using dvbsnoop last night, then decided it
> couldn't possibly be so simple. Seems I was right after all...
>
> The data is transmitted in the EIT. Each entry has zero, 1 or 2 Content
> Identifier Descriptors, with table ID 0x76. The format of this descriptor
> seems to be:
>
> Descriptor tag, 8 bits (always 0x76)
> Descriptor length, 8 bits
> crid_type, 6 bits
> crid_location, 2 bits (always seems to be 00)
> crid_len, 8 bits
> crid_data, crid_len bytes.
>
> If crid_type = 0x31 then crid_data contains the program ID, which I think
> is supposed to uniquely identify the programme irrespective of repeats
> etc.
>
> If crid_type = 0x32 then crid_data contains the series ID, which should be
> the same across all episodes of a series. The series ID is sometimes
> omitted if the programme is a one-off.
>
> I'm not sure just how unique these identifiers are supposed to be; the
> series identifiers are generally 5-digit numbers or 6-character alpha
> strings preceded by "/", while the program ID seems to have the episode
> number appended.
>
> On Sandy Heath I only see this data on the BBC, "4" and sky channels, not
> ITV.
>
> Dave
>
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