[mythtv-users] Commercial Detection

[John Pilkington]

On 08/03/12 10:47, Lawrence Rust 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.
>

This looks useful and I really should give it a whirl.

What I'd really like is something to cut between 'coming up next in an 
hour is blah blah blah but (speed up and feign yet more excitement) / 
now (occasionally worthwhile) more blah blah blah'

Cheers

John P