[mythtvnz] reasonably effective commercial detection silence.preset for NZ?

[James Walker]

Karl - just to be clear are you using the normal mythcomflag process?  Or the silence detection system per the wiki page I linked in my earlier email?

If you are still on mythcommflag then it will be pretty intensive as its scrubbing through the video frames looking for various things.   As Nick noted the Silence detection system is looking only at the sound stream.  Much lighter weight to process.


> On 7/05/2018, at 5:25 PM, Karl <skooobie at gmail.com> wrote:
> 
> I hear what you are saying and I agree. When I saw my CPU going through the roof I saw the job running as ad detection and when I disabled it my CPU went right down to normal. Strange. SO I have always thought this was a CPU intensive thing,. I noted the jobs ran after the recording completed and it redid those until I disabled the detection. Anyways I am happy enough to give it another go now as I am setting up new mythtv on 18.04. 
> 
> On 7 May 2018 at 15:19, Nick Rout <nick.rout at gmail.com <mailto:nick.rout at gmail.com>> wrote:
> Silence detection is not CPU intensive as it involves no video decoding. 
> 
> 
> On Mon, May 7, 2018 at 2:59 PM, James Walker <james.walker.nz at me.com <mailto:james.walker.nz at me.com>> wrote:
> The tooling I have setup is per this wiki page:
> https://www.mythtv.org/wiki/Commercial_detection_with_silences <http://www.mythtv.org/wiki/Commercial_detection_with_silences>
> 
> The processing seems to be reasonably light weight and pretty fast. I do have a quad core backend master sever that just shrugs when 2 such jobs are processing.  However on older kit I can see how it might be more pushed.
> 
> As to effectiveness - the wiki page “advertises” it as working/workable in NZ, hence my question to the community.  However having analysed some of the shows on various channels I can see how tough it will be to get consistent “okay” results. The methods for fading between shows and commercials are all over the place.
> 
> I’ve been using the skip facilities for years so no issue returning to that.  I was just hoping to achieve some processing magic  :-)
> 
> Cheers,
> James.
> 
>> On 7/05/2018, at 2:46 PM, Karl <skooobie at gmail.com <mailto:skooobie at gmail.com>> wrote:
>> 
>> Yep. The commercial detection is very processed hungry. And as Stephen mentions as we have skip ability (which we can fine tune too) then no real need anyway.
>> 
>> On Mon, 7 May 2018, 14:17 Stephen Worthington, <stephen_agent at jsw.gen.nz <mailto:stephen_agent at jsw.gen.nz>> wrote:
>> On Mon, 7 May 2018 08:35:23 +1200, you wrote:
>> 
>> >On 06/05/18 20:16, Stephen Worthington wrote:
>> >> I have
>> >> just given up and turned it off so as not to waste all the CPU cycles
>> >> and electricity it was using, as it never worked.
>> >Where do you turn it off?
>> 
>> Mythtv-setup > General > Job Queue (Backend-Specific) > Allow advert
>> detection jobs
>> 
>> MariaDB [mythconverg]> select * from settings where
>> value='JobAllowCommFlag';
>> +------------------+------+----------+
>> | value            | data | hostname |
>> +------------------+------+----------+
>> | JobAllowCommFlag | 0    | mypvr    |
>> +------------------+------+----------+
>> 1 row in set (0.00 sec)
>> 
>> I also changed my recording templates to turn off the option in there
>> that creates the mythcommflag job, and used SQL to do the same in all
>> my recording rules.
>> 
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