[mythtv-users] [mythtv-commits] Ticket #2086: 1er show starttime equal 2nd endtime 2nd show don't start

[David C. Dean]

That's pretty interesting.  I just wondered because _all_ of my 
recordings appear to start a few minutes in.  I considered doing NTP for 
the myth box, but I haven't gotten around to it.  In the meantime, it's 
a few seconds off from my alarm clock... which sets itself.  I wonder if 
that's my problem.  I only have one tuner board, so I was afraid to set 
the start and end times wide... fearing back-to-back recordings would be 
all goofed up. 

Thanks for the info Joe, I'll see if NTP doesn't help out.

 - Dave

Joe Votour wrote:
>> Speaking of which, is it common for shows to always start like 3 minutes
>> before myth wants to record?  Is this an anti-tivo technique or something?
>>
>> Michael T. Dean wrote:
>>     
>>> On 07/22/06 15:56, MythTV wrote:
>>>
>>>
>>>       
>>>> #2086: 1er show starttime equal 2nd endtime 2nd show don't start
>>>>
>>>>         
>
> <snip>
>
>   
>
> Within the TV world, there are several different clocks that are in use:
> 1. The clock wthin the original satellite feed (a.k.a. the Network),
> 2. The clock within the cable office that takes the satellite feed and
> rebroadcasts it,
> 3. The clock at the household of the user,
> 4. The clock on the PC/device recording the show
>
> Naturally, with 3 and 4, these tend to be somewhat inaccurate, unless all
> of your devices are using NTP.  Most people tend to set (4) by (3),
> though, especially for non-Internet connected devices.
>
> The satellite clock is usually pretty good (but known to drift), it's
> usually the cable company's clock that is slightly off.  Additionally,
> there is a bunch of equipment there to process the shows - IRDs to capture
> from the satellite, streaming servers to buffer/stream what came from the
> IRD, equipment to take the video stream from the streaming server,
> re-multiplex it, convert it to QAM (or analog), and finally get it into
> your household.
>
> Because of all of these factors, it's not uncommon for shows to start
> either early or late, depending on the channel in question.  Additionally,
> some feeds are played late, because the network (or cable company) want
> the ability to censor things - CBC's Hockey Night in Canada, last I heard
> had the Coaches Corner segment played back with a seven second tape-delay
> because Don Cherry has a habit of opening his big fat mouth and inserting
> his foot - We love you anyway, Don.  :) .
>
> Thus, as a precaution, I actually add two minutes before and two minutes
> after every show that I record.  I have two analog and one digital tuner,
> so this isn't much of a problem.
>
> The anti-Tivo technique you're thinking of was when NBC would start their
> shows at one minute before the hour to screw up single-tuner recorders
> without intelligent scheduling.  Of course, then again, I remember when
> TBS actually put their shows on at five minutes past the hour to
> accomplish the same thing.
>
> -- Joe
>
>
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