2011/4/28 Peter Retep <[email protected]>:
> Hello community,

Hi Peter,

> I am currently working on a scheduler to switch between multiple audio input 
> streams (of cause using liquidsoap).
> The scheduler uses absolute date and time format for start/stop of a audio 
> source.
>
> At the moment I think about which file format would be the best for this 
> purpose.
> I have searched a lot for playlist or even feed formats which support this, 
> but did not find anything that matchs perfectly.
> Thats why I am asking you if you know any standard format for playlist format 
> which supports absolute timing.
>
> All I found up to now is SMIL language, but I do not know if I use in the 
> right way if I write
>
> <?xml version="1.0" encoding="iso-8859-1"?>
> <!DOCTYPE smil PUBLIC "-//W3C//DTD SMIL 3.0 Daisy//EN" 
> "http://www.w3.org/2008/SMIL30/SMIL30Daisy.dtd";>
> <smil
>     version="3.0"
>     xmlns="http://www.w3.org/ns/SMIL";
>  >
> <seq>
> <audio src="http://stream/source1"; begin="2011-04-28T19:00:00" 
> end="2011-04-28T20:00:00" />
> <audio src="http://stream/source2"; begin="2011-04-28T20:00:00" 
> end="2011-04-28T21:00:00" />
> </seq>
> </smil>
>
> Do you have any ideas or comments or can propose other common standard 
> formats?

Actually I do not. While I was prospecting for xml playlist formats, I
also came across the SMIL one which, if I remember well, is mostly
designed for advanced media muxing and has a lot of details that are
impractical for simple scheduling purposes.

Working with an open mind, I believe that maybe it could be possible
to define a new format specific for scheduling purposes. As I see it
the format could be simple and have the following information:
 * URI/location of the media
 * Metadata associated with the media
 * cue_in/cue_out point
 * Information defining transitions (possibly of free format, to be
interpreted by the player)

These are just ideas but I think it would not be too hard and possibly
beneficial to a broader audience to have such format.

Finally, as a personal taste, I would avoid using xml and use maybe
json or YAML..

Romain

> BR, Peter
>
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