[asterisk-users] sox: Failed reading obd-demo.mp3: Do not understand format type: mp3

[Matthew J. Roth]

Kaushal,

Your version of SoX does not have MP3 support.  Since you have LAME
installed, use it as a first step to produce an intermediate file
that SoX supports.  Then use SoX to convert the intermediate file
to the desired format.

Step 1
------

# lame --decode obd-demo.mp3 obd-demo.wav
input:  obd-demo.mp3  (8 kHz, 1 channel, MPEG-2.5 Layer III)
output: obd-demo.wav  (16 bit, Microsoft WAVE)
skipping initial 1105 samples (encoder+decoder delay)
Frame# 16818/16818   16 kbps
# file obd-demo.wav
obd-demo.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz


Step 2
------

# sox -V obd-demo.wav -r 8000 -b -t ul -c 1 obd-demo.ulaw
sox: Detected file format type: wav

sox: WAV Chunk fmt
sox: WAV Chunk data
sox: Reading Wave file: Microsoft PCM format, 1 channel, 8000 samp/sec
sox:         16000 byte/sec, 2 block align, 16 bits/samp, 19372126 data bytes
sox:         9686063 Samps/chans
sox: Input file obd-demo.wav: using sample rate 8000
        size shorts, encoding signed (2's complement), 1 channel
sox: Output file obd-demo.ulaw: using sample rate 8000
        size bytes, encoding u-law, 1 channel
sox: Output file: comment "Processed by SoX"


Regards,

Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer