[ecasound] Multiple Instances running concurrently scaling...

Hello,

I am a LAMP programmer writing a 'Fair Trade' digital download service,
in PhP, for independent musicians ( www.mysongstore.com ), and I would
like to use ecasound in one part of my system ( a part that creates a 20
- 30 second sound clip from a 'user uploaded' file). I have some
questions regarding ecasound's abilities and a weird execution problem.
Please excuse me if I am overly verbose, I tried many things before I
took to writing here... :)

Here is the use overview
---------------------------
I will have many simultaneous users uploading mp3s to my system, and
each one needs to have a clip created from it, on the fly, immediately
after PhP has passed the uploaded file to its destination directory. I
read through your user guide and the tutorial, and got this so far :

ecasound -i /path/to/upLoadedFile.mp3 -y:60
-o /same/path/clip-upLoadedFile.mp3 -t:30

(I will eventually, hopefully, also be able to create a fade-in at the
beginning and a fade-out at the end, but I haven't figured out how to do
that part in ecasound yet)

I am then using this in my PhP program, passed to the command line
using exec(). The clip should be created, and all good, but .....

The Problem
------------------------
no file is created, and nothing is logged. I have run the exact same PhP
program from the command line itself and ecasound performed correctly
and created the clip. However, the very same program run as a web app
fails to create a file, a log, an error, it dies silently.

the research
-------------
I found a wrapper for ecasound as a module for PhP
(http://pecl.php.net/package/ecasound), but it required a PhP recompile,
and said that it will fail if it ran in multiple instances.... which
renders it useless for me and made me wonder if ecasound can actually do
what I would like it to...

Finally the questions ...
-------------------------------------------
1. can ecasound handle more than one instance, like in daemon mode?
(could it handle the simultaneous clip creations)

2. what is the memory footprint like when it scales if point 1 is true?

3. any idea why the web app fails ?

4. Am I nutz for trying in the first place ? If so can you steer me to
somewhere I might find an app that does what I need ?

thank you for any time you put to this. I understand htat I am not using
ecasound in the manner for which it was intended, but it could really
help me if I could get it to work. I would love to use it for
mysongstore.com.

best regards,

Richard

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Received on Wed Feb 15 16:15:05 2006