A few points here:
- I see real data on CIII for a several weeks now. It was "DTV program" for months (or even years?) but it's all good now
- pretty sure CBLT gives you 168 hours worth (7 days * 24 hours)
- the data comes in 3 hour blocks called "EIT"s (event information table) each of which also has an associated "ETT" (extended text table)
- the FCC mandates at least 4 EITs are used. The CRTC in Canada has no requirement although most systems Canadian broadcasters use are FCC-compliant systems
- the EIT blocks are on the UTC clock and run from midnight to 3am, 3am to 6am, etc.
- the Eastern time zone is 4 hours behind UTC when we are daylight saving time, 5 hours behind on standard time. So at this time of the year, the blocks run from 8pm to 11pm, 11pm to 2am, 2 am to 5am, etc. In the winter, they run from 7pm to 10pm, 10pm to 1am, 1am to 4am, etc.
- as time progress through a block, the amount of data the viewer sees appears to shorten, then appears to jump back up when it cross into the next time block.
- a program that starts in the last block that runs past the end time of the last block will appear in its entirety, giving the viewer more than the usual amount of data (example: a show that runs 9pm to midnight would seem like a station has extended it's data but it's just temporary)
- main channels and subchannels always have the same number of EITs but because of the last program in the last block extending past the end time, it can appear to be different amounts of data sometimes
- if you are running TSReader on your computer, it will tell you exactly what the station is sending. Generally speaking, the broadcasters keep the number of EITs they use constant.
Originally Posted by videobruce
I did some compiling of the amount of time local stations provide their PSIP program data for those who do not have a Rovi?TVGOS supplied program Guide or subscribe to a on line supplier (TiVo for example).
Amazing the variance in the amount of time these stations. From nothing at all to a whopping eight full days
CHCH - none
CBLFT - none
CIII - none
(only shows "DTV program")
WBBZ - none
(only shows "DTV program")
CFTO - 9 hours
WPXJ - 9 hours
CITY - 9 hours
CFMT - 9 hours
WGRZ - 9 hours (same for their sub channel)
CJMT - 12 hours
WNED - 21 hours (same for their sub channel)
WNYO - 24 hours
WIVB - 27 hours
WNYO - 32 hours
WUTV - 33 hours
CICA - 4 days
CBLT - 8 days
These counts were verified a 2nd time a hour later between 7 and 8 am this morning. It is possible that these figures could vary according to the time of day, or even the day of the week, since it up purely up to the station and whomever is inputting the data to determine how long the schedule goes out.
Until I actually scrolled through CBLT's list I had no idea it could even go out that far. They, unfortunately are the exception. To show that this data isn't necessary correct, look at the 2nd attachment of CICA and the screwy times. Then look at WNYO's sub channel which doesn't need any listings (music videos). The generic "DTV program" is shown for every 6 hours.