From 8am-11pm I am recording the audio from a lecture theatre. I want to be
able to programatically and/or visually identify when the lecture theatre is
in use -- the audio feed is silent when not in use. I don't know what tools
could do this. Here are my ideas/desires (the first two are preferable):
-- Every 20 seconds, take a numerical reading of the amplitude level
currently being captured, like a "VU meter" with a "data logger" attached.
(This number would then be saved to a database along with a timestamp and
later processed -- the saving is the easy bit, it's just getting that
number.) I know ecasignalview shows the current level but it requires:
ecasound, ncurses (not possible to automatically grab relevant output so
useless here), and an open audio device (disadvantage).
-- After 11pm, process the audio file and record the amplitude level every
few seconds to a database.
-- Continually save a "spectrum analysis" of the live stream as an image
(eg. JPG) that could be viewed at any time.
-- After 11pm, get a "spectrum analysis" of the whole static file and save
it as an image (eg. JPG). The file is AAC within MP4, but I could convert
it to a compatible format (eg. WAV) with FAAD just for the analysis if
necessary. I don't think this could be done via an X GUI application as it
needs to be automated.
Do you know which application(s) will help in these situations?
Many thanks!
- pete <><
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