Gully wrote: ↑Wed Jul 04, 2018 11:02
IanSav wrote: ↑Wed Jul 04, 2018 00:23
If the CRID data that Prl reported last year is unchanged then the problem is that each ABC LCN uses a different authority. This makes exact CRID matching impossible. I do not have enough information to determine if a fuzzy match on the authority together with an exact match on CRID event and episode data would result in a valid repeat match. I am hoping that it would work as this could be very helpful for finding many more repeats than just matching on titles and descriptions.
It would be interesting to know if it could be made to work for even this as it is a fairly controlled simple example of repeated programs.
The problem is that I can't find any information about whether, when a broadcaster uses more than one CRID authority, that really means that the CRIDs within each authority are separate namespaces. If they are, then matching CRIDs between authorities from the same broadcaster can't be relied on. If they're not, and the broadcaster uses the same namespace, having declared via the different authorities that they don't use the same namespace, it's tricky to create a general rule that lets you compare two CRID authorities and decide "same broadcaster, therefore same namespace".
These are the CRID authorities I saw in Canberra last time I looked:
canberra.nitv.sbs.au
canberra.sbshd.sbs.au
canberra.sbsone.sbs.au
canberra.sbsthree.sbs.au
canberra.sbstwo.sbs.au
canberra.sbstwohd.sbs.au
can.sr1.win.au
can.sr2.win.au
can.sr3.win.au
can.sr4.win.au
can.sr5.win.au
can.sr6.win.au
can.sr7.win.au
canberra.1.sca.au
canberra.2.sca.au
canberra.3.sca.au
canberra.4.sca.au
canberra.5.sca.au
canberra.6.sca.au
canberra.7.sca.au
canberra.8.sca.au
canberra2.abc.net.au
canberra20.abc.net.au
canberra21.abc.net.au
canberra22.abc.net.au
canberra23.abc.net.au
canberraabcnews24.abc.net.au
Note that there were no CRIDs available at all for WIN at the time.
At around the same time, IanSav posted some of the CRID authorities for Melbourne:
seven.net.au (explicitly for all services)
nine.com.au (from 9HD, and perhaps implicitly for all services)
melbourne.sbshd.sbs.au (explicit per-service authority)
melbourne.ten.ten.au (from 10HD, and perhaps implicitly for all services)
melbourne20.abc.net.au (explicit per-service authority)
C31.community.com.au (only one service)
So in Melbourne, some broadcasters may be using a single authority for all their services, but ABC and SBS appear to be using per-service authorities. Also, at the time I collected the authority data for Canberra, the authority name for Viceland HD was canberra.sbstwohd.sbs.au.
I only have this information for a very small set of locations, but the consistency of what I have isn't encouraging.