[mythtv-users] Auto transcode after commercial flagging

steve networks1 at cox.net
Fri Jan 12 22:12:59 UTC 2007

Aha.  That explains a lot--thank you.  The auto-skip should work just fine
for my purposes, and I see there is a default setting for it in the setup


I've read all these warnings about inaccuracy in commercial flagging but I
have yet to see a single error.  Maybe I watch "easy" programs or something.





From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Brad DerManouelian
Sent: Friday, January 12, 2007 2:34 PM
To: Discussion about mythtv
Subject: Re: [mythtv-users] Auto transcode after commercial flagging


On Jan 12, 2007, at 12:11 PM, steve wrote:

So if I set MythTV to mark commercials while it's recording, then to
automatically transcode after recording is complete, should it transcode and
cut commercials (I can't see any reason why not), or can this only happen
with manual action as implied in the manual?

Notice you used two separate terms. "mark commercials" and "cut commercials"
which indeed are two very different things.


mythcommflag does not add cutlists by default. It adds commercial flags. The
difference is that when transcoding, it ignores commercial flagging but
removes video between points in the cutlist. commflags are detected by the
player and handled when playing back according to the setting (do nothing,
notify there is a commercial flag, auto skip to the end of the commflag).
This is because commercial flagging is not 100% accurate and many people
would be upset to lose parts of their recordings if they don't view the
video and manually decide to actually cut video based on what mythcommflag
thought were commercials.


You can over-ride the mythcommflag command to add --gencutlist which would
then create a cutlist instead of commercial flags - but don't complain when
you lose parts of your program or if it missed the first commercial break,
cuts our your program and leaves all the commercials (I haven't seen this,
but I suppose it's possible in theory despite safeguards that it will never
make a commercial flag more than x minutes or whatever). :)


People who want to automatically cut commercials usually set up a separate
user job for programs where they feel confident they can trust mythcommflag
and remove the video automatically. They would set this particular program
to not run commflag after recording, then execute a user job set up exactly
like commflag except with --gencutlist in the command, then run transcode.

 One other question is how I can tell whether a particular show has been
transcoded already or not. There doesn't seem to be an icon to indicate this
on the screen that lists the recorded shows.  So if a commercials aren't
gone on a given show I can't tell if it's because transcoding isn't
happening (or hasn't happened yet) or because it transcoded but didn't cut
the commercials.

There is an icon to tell if the program has been flagged for commercials
which should help in your determination. I usually look at the file size to
determine if it's been transcoded or not. Some of the newer themes coming
out as displaying the filesize right in the Watch Recordings screen which is
convenient for this.




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