[mythtv-users] Job priority within Myth's job queue

Steven Adeff adeffs.mythtv at gmail.com
Mon Apr 10 21:43:11 UTC 2006

On 4/10/06, Michael T. Dean <mtdean at thirdcontact.com> wrote:
> On 04/10/2006 04:33 PM, G. Panula wrote:
> > Is there a way to give Commercial Flagging jobs priority over
> > Transcoding jobs within Myth's job queue?
> >
> In mythtv-setup (on page "Job Queue (Global)"):
> Run Transcode Jobs before Auto-Commercial Flagging
> If set, if both auto-transcode and auto commercial flagging are turned
> ON for a recording, transcoding will run first, otherwise, commercial
> flagging runs first.
> (Note, however, that if you specify transcode before commflag and
> real-time commflagging, your commflagging won't be real-time because it
> still waits until after the transcode, which occurs after recording.)
> > Here is the scenario...
> > Front-end has the tuner card which writes to a Back-end.
> > Front-end is only allowed to process jobs(e.g. commercial flagging) from
> > the queue only during the wee hours of the morning when no one is likely
> > to be watching tv.
> > The Back-end processes jobs 24x7.
> > "Real-time" commercial flagging is enabled.
> > Commercial flagging and Transcoding are enabled for all recordings.
> >
> > When recording a line-up of programs say
> > 5:30pm That 70s show
> > 6:00pm The Simpsons
> > 6:30pm The Simpsons
> >
> > Front-end starts recording "That 70s show" and adds a commercial
> > flagging job to the queue.  Back-end sees the job and starts it.
> >
> > Then the front-end finishes recording "That 70s show", adds a transcode
> > job, starts recording the first "Simpsons" and adds a commercial
> > flagging job for it.
> >
> > The *problem* is the transcoding job is the next job in the queue and
> > the back-end faithfully starts working on it.  Even if I have the
> > back-end only checking the queue every 5 minutes, it still picks the
> > transcoding job first.  I think jobs are just processed on age; oldest
> > one first aka FIFO(First In First Out)
> >
> > Ideally the commercial flagging jobs should have a higher priority than
> > transcoding job or at least an option to say do commercial flagging jobs
> > first.
> Actually, the setting is meant for the opposite because after the
> transcode, commflagging needs to be re-run (new format, new size, new
> frame positions, ... whatever).  However, this is applied on a
> per-recording basis--it's not a general prioritization.  So, you'll
> still get mixed commflag/transcode jobs occurring.
> Mike

he means have commflagging queue up before any existing transcoding
jobs, even those for other shows.

I agree, this would be a nice feature. I can deal with transcoding
"later", but I'd rather have all commflagging occur before any
transcoding begins uinless I tell Myth otherwise.


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