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.
Thanks!
Romain
Le ven. 1 févr. 2019 à 14:32, Romain Beauxis <notificati...@github.com
<mailto:notificati...@github.com>> a écrit :
This is a pre-release for testing purposes! Changelog at the time:
New:
*
Added |(to_){string,float,int,bool}_getter| operators to
handle getters in script side.
*
Made |p| parameter in |smooth_add| a |float| getter (#601
<https://github.com/savonet/liquidsoap/issues/601>)
*
Added |source.time| to get a source's clock time.
*
Added support for |aacgain|, thanks to @mdurys
<https://github.com/mdurys> (#702
<https://github.com/savonet/liquidsoap/pull/702>)
Changed:
*
Remove dynamic plugin build option.
*
Made |on_end| delay a float getter.
*
Reimplemented |fade.{in,initial,out,final}| as scripted
operators. (#664 <https://github.com/savonet/liquidsoap/pull/664>)
*
Reimplemented |open_process_full| to get a hand on |pid| and
finer-grained closing workflow (#703
<https://github.com/savonet/liquidsoap/pull/703>)
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Kind regards
Thorben Werner Sjøstrøm Dahl
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