[mythtv-users] Where does commercial flagging happen???

James Crow james at ultratans.com
Tue Nov 4 18:49:34 UTC 2008


On Tue, 2008-11-04 at 10:02 -0700, Brian Wood wrote:
> stuart wrote:
> > Hi...
> > 
> > I had noticed that when my single core MBE was commercial flagging that 
> > the duel core SBE would not be able to play back programming streamming 
> > from the MBE w/o some annoying jitter.  So I disabled the commercial 
> > flagging on the MBE unless it was between midnight and 6am.  (Solving 
> > this problem, if possible, deserves another thread.)
> > 
> > Recently, I noticed the duel core SBE was again having jitter problems. 
> >   This time playing as SD OTA ATSC recording.  Hummmm!  I checked and 
> > noticed the SBE was doing a commercial flagging session.  I'm thinking 
> > this shouldn't be a problem - it's a duel core machine!
> > 
> > Then a friend suggested the SBE was doing a MBE commercial flagging. 
> > That is, I was probably transmitting the equivalent of 3 shows over my 1 
> > network between the MBE and SBE machines.
> > 
> > Even if I didn't set the "flag commercials on the machine it was 
> > recorded on" for either the MBE or SBE, I would have never thought a 
> > mythtv network would go out of it's way to flag commercials on anything 
> > but the MBE.
> > 
> > So what to people think, will setting the MBE to only flag commercials 
> > during off hours (something like midnight to 6am) cause the MBE to 
> > executed a "remote commercial flagging session" on a recording recorded 
> > and stored on the MBE?
> > 
> > (Note, FYI, there are tuners on both the MBE and SBE machines.)
> 
> The problem may well not be CPU resources, but disk I/O. Many people
> have pointed out that it's best to have your OS and/or DB on a different
> spindle from the video storage.
> 
> I had a similar problem on an older machine, which was solved by
> adjusting the PCI latency values of the IDE controllers.
> 
> I was then able to make 3 recordings, run a commflag job and playback a
> recording, all at the same time (all SD) with a single-core AMD64 3700+
> (running in 32-bit mode).
> 
> I'd look at your disk I/O situation when flagging commercials while
> playing back.
> 
> 
> bew

Brian,

  Would you mind sharing any hints on how to monitor disk i/o or change
PCI latency under Linux? I think I may be hitting this issue while
recording three streams (PVR-500, OTA ATSC), comm flagging and watching
a HD show.

Thanks,
James




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