[mythtv-users] Commercial Detection

[Anthony Giggins]

On 8 March 2012 20:47, Lawrence Rust <lvr at softsystem.co.uk> wrote:

> On Wed, 2012-03-07 at 23:13 +0000, Thomas Boehm wrote:
> > Martin Moores wrote:
> > > On 7 March 2012 21:58, Doug Lytle <support at drdos.info
> > > <mailto:support at drdos.info>> wrote:
> > >
> > >
> > >     And I believe there was an external script based on volume changes
> on a
> > >     channel that people have reported good results with.
> > >
> > >
> > > Indeed, I never got around to trying that, but many said they had a lot
> > > of success with it:
> >
> > It works very well for me. I changed the script so that it runs on all
> > channels, not only the white listed ones. If there is really a show
> > which doesn't get marked properly, I still press the forward button a
> > few times as I did before, but most of the times it works.
> >
> > The mythcommflag which comes with MythTV takes much longer and basically
> > doesn't work at all in the UK.
>
> I use a script based on the wiki article
> www.mythtv.org/wiki/Mythcommflag-wrapper with good success on most UK
> Freesat channels.
>
> I found that changing the silence threshold to -76 dB from -70
> significantly improved accuracy.  Also, decreasing the coalescence time
> from 400 to 360 seconds reduced the prevalence of false positives.  The
> last useful tweak is to the awk program to add 'cut to beginning' or
> 'cut to end' without leaving 'dangling' frames.
>
> This generally leaves a few frames of ads/titles before and after each
> cut.  The only annoyance is that the post ad cut doesn't position to a
> keyframe so the cut isn't entirely invisible.  I'm working on that and
> back tracking from the start of cut to detect a scene change.
>
> The script can be found here:
> http://www.softsystem.co.uk/download/mythtv/mythcommflag-silence.sh
>
> To run it as a user job, start mythtv-setup and find General/JobQueue
> (Global) and set the Ad-detection command:
> mythcommflag-silence.sh -j %JOBID% -C
>
> The -C option copies the list to the cutlist.
>
> --
>

I get an error in this script when running from a command prompt

./mythcommflag-silence.sh -c 4010 -s "2011-09-29 21:10:00" -i
/storage3/recordings/4010_20110929211000.mpg
mythcommflag-silence.sh: line 11: syntax error near unexpected token `cat'

I assume the syntax here is not correct?

Help() cat >&2 <<END
Detect commercial breaks in a TV recording using silence detection.
Usage: ${myname##*/} [options]
Options:
  -b <n>    Coalesce ad breaks upto [$MAXCOMMBREAKSECS] Seconds
  -c <n>    Channel ID
  -d <f>    Min silence duration [$SILENCE_DURATION] Seconds
  -i <path> Recording filename
  -j <n>    Job ID
  -s <s>    Start-time
  -t <n>    Silence threshold [$SILENCE_THRESHOLD] dB (-96..0)
  -C        Copy to cutlist [$COPYTOCUTLIST]
  -M <path> MythTV settings folder [$MYTHCONFDIR]
  -h        Display this help and exit
  -V        Display version and exit

A job ID, channel ID and start-time or a recording filename must be
specified.
END


Cheers,

Anthony
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