Hi, I am not sure what you are doing exactly there, but if the filename
of the generated mp3 gave the title, I would use that by scripting just
a little. If that was not the case then I would probably try to create
the mp3 with metadata so that everything is ready from start and not
need to complicate things later. But again, I made such thoughts while
not really understanding the situation very very well.
George
On 03/21/2017 11:44 PM, Jeff Garvas wrote:
On Tue, Mar 21, 2017 at 12:54 AM, Romain Beauxis <[email protected]
<mailto:[email protected]>> wrote:
2017-03-20 14:23 GMT-05:00 Jeff Garvas <[email protected]
<mailto:[email protected]>>:
>
> I'm using liquidsoap for an unconventional use case where I
predominantly
> stream silence, and inject very short audio files sourced from a
police
> scanner.
Well, that certainly is an interesting usage!
It's working quite well. When the application that generates a .mp3
file writes the file it runs a script I wrote that connects to the
socket and queues the mp3 file. Liquidsoap is pointed to a mount
point at http://broadcastify.com.
> Here is the challenge I have -- I want to be able to include a
StreamTitle=
> in the streaming payload immediately prior to adding a new track
to the
> queue. I ran a packet capture on windows based application
that supports
> alpha tagging and in the payload itself of the mp3 stream there is a
> StreamTitle= immediately prior to the begining of a new mp3
audio source
> (when transitioning from silence)
By StreamTitle, I assume that you mean to set the track's
metadata, like artist or title as they are later sent via
output.icecast etc.
Yes - but I literally mean StreamTitle. I did a packet capture of
another application that does this called RadioFeed, where you use an
audio cable to feed a sound card and a serial cable to get the "alpha
tag" of the channel from the scanner itself. If you look at the
packet capture the alpha tag of the channel (say, "PD Dispatch") is in
the payload like this: StreamTitle=PD%20Dispatch (i think the %20 was
in there, not 100% sure).
So its a format that uses the phrase StreamTitle. I don't know if
this is a old meta tag methodology, shoutcast specific, or icecast?
It is not sending http updates to the server, its in the stream itself.
Have you tried the annotate: protocol? You can wrap your request
into a annotate: uri, allowing you to pass extra metadata.
For instance, instead of:
<source>.push http://.. (or /path/to/file etc.)
You can do:
<source>.push annotate:title="My Custom Title",artist="My custom
artist":http://..
I've messed with a number of approaches where maybe I'd inject the
title via the socket immediately prior to queuing and while I got that
working it was making a separate http:// call to my icecast test
server, and the problem is these titles can change very frequently.
My preference would be to inject the title into the .mp3 and have some
sort of rewrite logic take the content of that metatag and somehow put
it into SongTitle= or an equivalent but I can't find any comprehensive
documentation on how to do that :/
And the annotated metadata will be added, possibly overriding any
metadata with the same field name in your original request.
By default, fallback() and switch() replay the last metadata from
a child source when switching back to it.
Is there a way to override it with something or blank it out?
By the way, do you need a finite silence in your script? It feel
like, with track_sensitive=false, your fallback would switch to
the request source immediately when it becomes available..
I basically need it to not stream any audio at all when there isn't
something in the queue. If you want to hear it yourself you can go
here, click on the play icon, and play the audio. It may be silent
for a minute or two until someone speaks :)
http://www.broadcastify.com/listen/feed/24877
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