[LAU] Advice on scripted assembling and mixing of a Radio Show

[Julien Claassen]

Hi!
   Ecasound was my first suggestion. If you like to script it, here are a few 
hints.
ecalength, can give you length in seconds or mm:ss format. You'd just have to 
awk or sed your way through it, not too hard. there are others sndfile-* 
collection and more to do that.
   The new ecasound-version has the playat feature, which is positioning a 
starting point into the output:
ecasound -i playat,time_in_seconds.decimal_rest,file_to_play -o output
   A normal mixing setup:
ecasound -a:chain_1 -i some_input -a:chain_2 -i more_input ... -a:all -o 
mixdown
   Use -ea:volume_in_percent after each filename, to give relative volumes.
   Ecasound has to volume mixmodes:
ecasound -z:mixmode,avg [all_the_rest]
   Average: So with three chains volume of each chain is (100/3)%. this value 
counts as 100. So if you mix three full volume signals the effective volume of 
the whole is 100% volume. No clipping, but not a bit more.
   ecasound -z;mixmode,sum [all_the_rest]
   Each track is at REAL full 100% volume. So with four chains blasting at full 
volume, all playing at the same time choose
-ea:25
   for each one, so 25 * 4 = 100.
   Ecasound itself doesn't worry about you playing tracks at the same time or 
just concatenating them. So you could have:
ecasound [mixmode and other general options] \
-a:intro -i this_is.wav -a:station_1 -i playat,3.2,my_station.wav \
-a:playing -i playat,5.6,playing.wav -a:title_1 -i playat,6.2,my_title.wav \
-a:bed_1 -i bed_1.wav -ea:30 ... -a:all -o mixdown.wav
   I don't know about the looping of the bed. Ecasound has looping input, 
something like playat, but it doesn't fade. But I think there's some software 
around for that. Or perhaps sooperlooper ladspa plugin can do it with 
ecasound.
   The times I gave would have to be calculated by your script of course.
   I hope this was OK, not too much and not too few info. If you like this 
solution and have more questions, I'm here.
   btw.: Csound might be an alternative. You could use your script to write 
csound .orc and .sco files. Just another idea. There you have looping in the 
ways you like it.
   Kindest regards
         Julien

--------
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