AGI: Is there a time limit on AGI execution?

Asterisk Asterisk APIs
1

I am using a python AGI script to make .flac sound files from ‘.mp3’ but there is some unwanted clipping.

I have used ffmpeg:

ffmpeg -i path/to/audio.mp3 path/to/audio.flac

and in python AGI:

import subprocess

subprocess.call(['ffmpeg', '-i', 'path/to/audio.mp3', 'path/to/audio.flac'])

There seems to be a difference in the duration of the output files (also the content)

I am checking the duration like:

ffmpeg -i /path/to/audio.extn 2>&1

The output for .mp3 (source) is

Duration: 00:00:06.45, start: 0.000000, bitrate: 48 kb/s
Stream #0:0: Audio: mp3, 22050 Hz, mono, s16p, 48 kb/s

Output for .flac generated via agi:

Duration: 00:00:06.14, start: 0.000000, bitrate: 181 kb/s
Stream #0:0: Audio: flac, 20000 Hz, mono, s16

Output for `.flac’ generated by running the same python code in shell:

Duration: 00:00:06.45, start: 0.000000, bitrate: 191 kb/s
Stream #0:0: Audio: flac, 22050 Hz, mono, s16

I have tried changing the bit-rate, sampling-rate to no avail.
Any hint regarding what could be going wrong would help me a great deal.

2

There is no built in time limit, and Asterisk doesn’t care what happens in the AGI provided the protocol is maintained. If ffmpeg output to stdout, and that was sent to Asterisk, then a problem could occur.