[mythtv-users] MythTV performance in a demanding real-life environment

[Chris Pinkham]

* On Mon Apr 09, 2007 at 10:20:09AM -0400, raphael wrote:
> To up the GAF I commflag everything concurrently with the recording. I 
> think it's niced, so you never have skips during the recording; the 

If you have your JobQueue CPU usage setting set to Low or Medium, then
yes mythcommflag does run nice(17).  With ~realtime flagging, the
Low vs Medium doesn't matter, because the ClassicCommDetector (aka
the All, Blank Frame, Scene Change, etc. flaggers) will regulate its
own speed to stay 30 seconds behind realtime/live.

> recording takes precedent. Often just a few minutes after I start 
> watching the show it will start autoskipping commercials. Commflagging 

Yes.  When you start watching a recording that is not currently flagged,
the player sends out a COMMFLAG_REQUEST event.  If a flagger is currently
running for that program, it takes note that someone is watching the
recording.  If you are watching an unflagged recording and mythcommflag
starts for that recording, mythcommflag sends out a COMMFLAG_START event
and the player responds with a COMMFLAG_REQUEST event so that the
flagger knows you are watching the recording.  When the flagger knows
that someone is watching a recording, it sends out updates to the
commercial skip list ever so often when it detects changes in the list.
This is what allows you to skip commercials while mythcommflag is
still flagging the recording.  This is one of the main components of
the ~realtime flagging feature.

--
Chris