[mythtv-users] Commercial Flagging (UK, DVB-T and DVB-S ), and lossless cutting.

[Martin Moores]

On 3 December 2012 20:51, John <reidjr at lineone.net> wrote:

>
>    On 25 November 2012 21:30, John <reidjr at lineone.net> wrote:
>>
>>  I have been playing around with Mythcommflag-wrapper<http://www.mythtv.org/wiki/Mythcommflag-wrapper>.
>>> It needed some simple changes to work on 0.26. It also lost the  dependency
>>> on myth-export ( In fact I couldn't get it to work properly with
>>> myth-export to find total no frames). I've moved what I can to mythutil,
>>> and deleted the comments that are no longer relevent. I added a few
>>> callsigns to the whitelist, but you need to make sure your own callsigns
>>> match !! [ on Freeview its ITV1 +1, on Freesat its ITV1+1 ]
>>>
>>> I've added my edited version to . I have been testing on 0.26, but it
>>> probably works on 0.25.
>>>
>>> My changes are superficial, and are just an update of the previous
>>> script(s). It works for me, and on some programs its excellent, others its
>>> not so lucky, but its a great deal better than the built in mythcommflag
>>> for UK TV.
>>>
>>> John
>>>
>>
> For those interested, I have updated
> http://www.mythtv.org/wiki/Mythcommflag-wrapper with a few minor changes:
>
> The final cut was being set as x-0, as i couldn't work out how to get the
> final frame value. This worked for skipping, but caused lossless_cut to
> fail. Now set to x-999999, which seems to do no harm.
>
> It does work on HD, as long as the HD has an full mpa sound track. DVB-S2
> (Freesat) in the UK has a secondary mpa channel on ITV/Channel 4 HD, so I
> have added them to the whitelist.
>
> I have found where the channel has main program and adverts, (ITV3 for
> instance) silence detect is spot on, as the silences are right at the "back
> soon" " welcome back" screens they often use on ITV3.
>
> advert-(silence)-program part
> 1-backsoon-(silence)-adverts-(silence)-welcome back-[program part 2]
>
> which skips/cuts to
>
> program part 1-backsoon-welcome back-program part 2
>
> Other channels such as E4 tend to have a lot of trailers around the
> programs I am recording, and these are treated as main program. They also
> often have "sponsored by" clips before and after
>
> advert - (silence) - Trailer - sponsored by - program part 1 - sponsored
> by - Trailer - silence - advert-silence - sponsored by - program part 2
>
> which skips/cuts to:
>
> Trailer - sponsored by - program part 1 - sponsored by - Trailer -
> sponsored by - program part 2
>
> Not as clean, but you still lose the real adverts, but you have to
> manually skip the trailers and sponsorship statements.
>
>
> I assume from other comments that the DVB-T2 (Freeview) versions are AC3
> only, and will need to be removed from the whitelist for DVB-T2 users. I
> don't have a DVB-T2 card so can't test.
>
> I have replaced ffmpeg -i with avconv -i . DVB-S channels usually have 2
> audio channels. main mpa and audio descriptive mpa, or AC3 and mpa.
> Occasionally ffmpeg -i was picking the audio descriptive track, which is
> mostly silence. No idea why, but changing to avconv seems to fix it, and
> ffmpeg is deprecated in favor of avconv, so its all good.
>
> I have been experimenting with this updated mythcommflag-wrapper script in
> conjunction with the lossless_cut script from Doug Vaughan. I am getting
> good results, but it needed a few tweaks due to peculiarities of UK TV, and
> my DVB-T card. I am getting good results flagging and cutting HD on DVB-S2.
>
> Lossless_cut needs a tweak to ensure the audio descriptive track present
> on UK DVB-S channels doesn't become the default after cutting. The tweak
> can be applied from the conf file (documented in the conf file), thanks to
> additional work from Doug.
>
> John
>

John,

Just updated to the latest version of the script, many thanks for your work
on this.

I am a Freeview user, so will keep an eye on the flagging here and see how
it works.

Cheers

Martin
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