[FFmpeg-user] ITU-R BS.1770-1 (Netflix) audio measurement, just hack it...

[Bouke]

> On 11 Aug 2021, at 12:18, Bouke <bouke at editb.nl> wrote:
> 
>> 
>> On 11 Aug 2021, at 09:01, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>> 
>> 
>> 
>>> Am 10.08.2021 um 11:03 schrieb Bouke <bouke at editb.nl>:
>>> 
>>> I'm using the R128 functionality now, but Netflix wants sound to be Dolby dialogue-gated measured.
>> 
>>> Seems that the needed Dolby code is free now.
>> 
>> Very generally, this was unlikely, after following the links you provided, it’s not correct.
>> („free“ has more than one meaning, on a mailing list that deals with open source software, the interpretation „no money needed“ is not relevant.)
> 
> Hi Carl Eugen,
> Sorry, my bad, I should have seen that one coming.
> 
> Nevertheless, I can see some possibilities:
> Redo / reverse engineer the dialog gating with ’some’ filter, and implement 1770-1.
> It does not need to be exact the same as Dolby wants, as Netflix allows for +/- 2 LU. (And that’s a lot I woud think.)
> 
> Another option perhaps could be that I pay someone for a custom version that I can distribute. (In which case I need to do the Dolby dance.)


Thinking of it, for Netflix delivery, there also have to be stems.
So a silence detection of the dialogue stem should provide data for timeline measuring.
It won’t be exactly the same, but I bet it will get very close.

Bouke

> 
> What do you think?
> 
> Bouke
> 
> 
>> 
>> Carl Eugen
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org <mailto:ffmpeg-user at ffmpeg.org>
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-user <https://ffmpeg.org/mailman/listinfo/ffmpeg-user>
>> 
>> To unsubscribe, visit link above, or email
>> ffmpeg-user-request at ffmpeg.org <mailto:ffmpeg-user-request at ffmpeg.org> with subject "unsubscribe".
> 
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org <mailto:ffmpeg-user at ffmpeg.org>
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user <https://ffmpeg.org/mailman/listinfo/ffmpeg-user>
> 
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org <mailto:ffmpeg-user-request at ffmpeg.org> with subject "unsubscribe".