[mythtv-users] pre and post record?

[Joseph A. Caputo]

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org]On Behalf Of Chris Petersen
> Sent: Sunday, September 07, 2003 8:37 PM
> To: mythtv-users at mythtv.org
> Subject: [mythtv-users] pre and post record?
>
>
> I've been having some trouble lately with my recordings having their
> beginnings getting cut off because the stations start broadcasting
> early, so I decided to bump up my pre-record (and post-record, just in
> case) to 120 seconds.  I just checked a recording that recently finished
> - nothing set to record before or after, and the hour-long show is
> 59:13.  I managed to get the whole show (luckily), but I would not have
> if my clock was a second different (thankfully, this channel seems to be
> aligned with my preferred ntp server).
>
> Anyway, I'm wondering how an hour-long show wouls get recorded at under
> 60 minutes, ESPECIALLY since I told it to record 2 minutes extra before
> and after the show...  I've checked many of my past recordings (back
> when I only pre/post recorded 60 seconds, and they're ALL about 45
> seconds shy of either 30 or 60 minutes, with no sign of the pre/post
> record ever happening....
>
> Is there something I need to enable besides just setting the pre/post
> values in the setup?
>
> using cvs from a few days ago.


I've noticed this too, occasionally, and though it's never bothered me I'm
curious.  I always assumed it was one of/a combination of (a) timing
resolution w/the scheduler and back-to-back recordings (b) NTP drift (c)
inaccuacies in the method of computing total time for a .nuv file in Myth.
I have no idea if any of the above are true, just some places to start
looking.

-JAC