Hi,
Le ven. 8 févr. 2019 à 06:23, Thorben Dahl <thor...@sjostrom.no> a écrit :
>
> Thanks for the heads-up!
>
> On 01.02.2019 22:00, Romain Beauxis wrote:
>
> Some of the future changes have in mind are:
> - Remove transitions in fallback/switch operators. As noticed in #695, these
> transitions do not often work as expected and make the code more complicated.
> They can be handled in smart_crossfade where they would work as expected.
>
>
> Let me know what are you guys thoughts on these changes and, in particular,
> if some of y'all do use crossfade instead of smart_crossfade for a specific
> reason and the same with fallback/switch transitions.
>
> I'd just like to know if our specific use of transitions on fallback is
> possible with smart_crossfade? Basically, what we do is start a separate
> program (through SystemD) when we detect silence on our live source, and stop
> that program when there is sound again. That program then notifies us about
> the problem in a Slack channel and keeps running to assist us, and also
> notifies us when the problem is fixed (in other words, when the program
> receives SIGTERM). This is implemented in our LiquidSoap script like this:
>
> # Functions for transitioning to and from silence/error
> def silence_start(from, to)
> system("sudo --non-interactive /bin/systemctl start silence-notifier")
> fade.initial(to, duration=1.)
> end
>
> def silence_stop(from, to)
> system("sudo --non-interactive /bin/systemctl stop silence-notifier")
> fade.initial(to, duration=1.)
> end
>
> # Live radio source
> radio = input.alsa()
> radio = mksafe(radio)
> radio = strip_blank(max_blank=12., min_noise=0.3, threshold=-45.,
> track_sensitive=false, radio)
>
> # Backup error source
> error = # some infallible source, in our case playlist.safe(...)
>
> # Our usage of transitions
> stream = fallback(track_sensitive=false, [radio, error],
> transitions=[silence_stop, silence_start])
> # ...
>
> This is working very well with our current setup, and I could not see any
> good way of achieving this with smart_crossfade, at least not with the
> version documented at
> https://www.liquidsoap.info/doc-1.3.6/reference.html#smart_crossfade. I
> generally don't see how you would go about setting up specific transitions
> depending on what source you are transitioning to, without using transitions
> in fallback or switch? I hope at least parts of this functionality can be
> kept in one way or another.
I've been working on the crossfade cleanup and eventually decided
against removing switch/fallback transitions. I'm gonna make some
changes on them but that shouldn't impact the way your script runs at
the moment.
I'll send a second alpha release out when I'm done with this part of the work.
Thanks for the feedback!
Romain
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