analyze a .wav or .mp3 file
terry at klarich.net
Mon Jan 11 21:06:51 UTC 2010
I would like to see if anyone has an idea how to analyze a wav or mp3 file in a shell script to see if there is any audio present;
or, it is a blank file.
I have used a script for several years called xmonline to listen to xmradio over the internet. Actually, I mostly used it to
record shows I wanted to listen to later. Since, the original script used mplayer to play the stream, I modified the script to
write to a file on disk. It worked well and I could listen to those shows on xm I had to miss for one reason or another. (my own
xm audio recorder.
Recently, XM has changed their interface such that the xmonline script will no longer work. I originally thought I cold use
firefox, and the analysis of the network trafic to write a new script. Using curl as the xmonline script did, I am able to get
logged into the site. But, when I dig out the stream and try and play it with mplayer, it doesn't work. I know I'm missing some
simple little cookie or authorization parameter. (Who knows)
Basically, I have given up on the streaming approach for now. And, will use the brute force method. I have my xmradio hooked up
via a sound card. I am able to listen to xm on my computer with aplay just fine. I even have a lirc config file that will turn
and off the unit and change channels. Works great.
My problem is I have no way of knowing if the unit is on or off. There is only a power toggle ir code. If there was a power-on,
my problems would be over.
To get around this problem, I will first record a 10 second clip and see if there is anything there or not. If there isn't, I know
the unit is off.
So, does anyone know a way to discover if there is any audio in a wav or mp3 file using a shell script running in the background?
Any suggestions wellcome.
If anyone wants my failed xmrip script, they are welcome to see what they can do with it.
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