Hi,
Thanks very much to reply faster than I do !
I’ve done extra experiments …

Le 28 août 2014 à 12:12, David Baelde <[email protected]> a écrit :
> run « make doc » from the doc subdirectory of the liquidsoap source tree, 
> it'll
> generate your own reference.html page.
Great
> 
>> 1/ my "safe" file has no sound. if I put a file with sound in the queue, it 
>> is played but without sound. If I try to do
>> safe=mux_audio(audio=blank(),single(…)), putting a correct request (tried 2 
>> different) in the queue does not fail but the file is not played … do you 
>> have clue of why ?
> 
> My guess is that you have something like output.icecast(%theora,infinite)
Nope, I don’t.
Well of course I did at first but your software is better than you think and 
complains with a type error :-).
Nether the less, my supposition is that mux_audio never reach an end of track.

My playground is
a = single("x")
b = single("y")
c = single("x")
output.icecast(%ogg(%theora,%vorbis),[…],add([blank(),rotate([a,mux_audio(audio=blank(),rotate(b,c]))])]))

It plays a, c, b, c, b, c ...

> 
>> 2/ If I replace live=rawlive by live=video.add_text.gstreamer(…,raw live), I 
>> have my received external stream with some text when a stream is received as 
>> expected but if I use live=video.add_image(…,raw live), live never fails and 
>> I have a black screen with my logo when no external stream is received. How 
>> could I get the behavior « image with logo if (and as long as) an image 
>> exists » ? More generally, is there a varient of « add » that fails as soon 
>> as one of its element fails ?
> 
> Surprisingly, we do not provide a ready-made solution for that. I'm
> not sure, but I think I would go with a track insensitive switch to
> disable the second source when the first one is not ready (you can use
> source.is_ready here). I haven't tried, please let us know if you
> manage to make it work, otherwise I'll experiment myself.
Yes,
add([
rawlive
,switch(track_sensitive=false,[((fun () -> 
source.is_ready(rawlive)),mux_audio(audio=blank(),single("LogoIncrustation.png 
»)))])
])
works as I expect!

> 
>> 3/ I’m sure the information is somewhere. My live stream is fragile and 
>> liquidsoap plays very well its role to fallback. Never the less, I would 
>> prefer that less than 3s freeze remains freeze rather than reload the « safe 
>> » video. How could I do that ?
> 
> That's a good question, but we don't have an answer yet. It requires
> some hacking on the input.http() operator. I'm telling you because I
> know you can get into our OCaml code: I'd be happy to guide you if you
> want to try this :)
Why not, let’s try to fix my other problems first anyway.
> 
> Cheers,
> -- 
> David


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