[mythtv-users] mythcommflag + changing frame size = skip list time skew

KS stantonx at comcast.net
Sat Sep 23 17:26:57 UTC 2006

I seem to be one of the very few unfortunates who have Comcast 
interjecting commercials with different frame sizes (resolution) during 
commercial breaks.  You may remember me from such postings as:
Now, with 0.20, things are MUCH improved!  We're able to skip forward 
through spot of differing frame sizes without crashing mythfrontend.  
mythcommflag never crashes, and has been able to flag all digital 
programs.  However, the cut list gets skewed by those same segments of 
different frame size.

In a recording, if the first commercial break(s) has no different frame 
sizes, the skip is accurate.  Starting with the first commercial break 
with differing frame sizes, the commercial notice is accurate, but then 
the skip list timing gets skewed by what seems to be the amount of time 
of the segment with the different frame size.  For example, if Comcast 
interjects for 60 seconds during the commercial break, the commercial 
skip doesn't skip the entire commercial set, but to a time which is 
short by 60 seconds.  From then on, the skip list is skewed by that time 
amount.  The next commercial will be announced 60 seconds early, and 
would end 60 seconds early.  Any additional segments of differing frame 
size will cause this skew to accumulate.

I'm guessing there's nothing I can do to avoid this problem.  Does 
anyone else have this?  Chris, is this an easy one to fix?  Hopefully 
you still have a few of my recordings.


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