Also, ever since the infamous Janet Jackson "wardrobe malfunction" almost all
live TV in the US is on a mandatory delay of several seconds so that offensive
(?) images and language can be censored.
I have a DTV-PAL over-the-air DVR box (made by Dish/Channelmaster, long since
discontinued). Earlier firmware versions chose one channel's PSIP data to use
as its time source. If that channel was broadcasting bogo-time, all your
recordings would be off. And the chance of bogo-time being broadcast is huge.
They later changed the time algorithm to use a median of all the channels it
sees. This gets the typical error to a few seconds.
They have a diagnostic screen that shows the PSIP time being broadcast by all
the stations (actually the first 20 stations). Several stations have random
times, some are off by +/- an hour, others are GMT. The stations that are
close are typically +/- a minute or so.
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