08-10-2012 11:24 AM - edited 03-16-2019 12:39 PM
We recently uploaded some new music to our CUCM 8.6 cluster. I've pre-converted the source to .wav (32-bit stereo). When I play the file on my computer, it sounds perfect. When I upload it to CUCM, there is a crackling noise layered on top of the music. It seems like the conversion process CUCM is using is adding noise into the audio file when it converts it.
Anyone with insight into how I can prevent CUCM from degrading teh audio?
01-24-2013 12:41 PM
Anyone else run into this? I'm running into something similar.
01-24-2013 12:54 PM
Hi Joshua,
Just wanted to reference the required file format
Format:
Average Data Rate 8.0 kb/second
Sample Rate 8.0 Khz
Audio Sample Size 8.0 Bit
Channels 1 (Mono)
Cheers!
Rob
01-24-2013 01:03 PM
Thanks Rob. I thought just about any wav file would work. The docs say
"
When the administrator imports an audio source file, the Cisco Unified Communications Manager Administration window interface processes the file and converts the file to the proper format(s) for use by the music on hold server.
•The recommended format for audio source files includes the following specifications:
•16-bit PCM wav file
•Stereo or mono
•Sample rates of 48 kHz, 32 kHz, 16 kHz, or 8 kHz
Additional Information
See the "Related Topics" section.
Creating Audio Sources
Most standard wav files serve as valid input audio source files, including the following file types:
•16-bit PCM (stereo/mono)
•8-bit CCITT a-law or mu-law (stereo/mono)
"
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmfeat/fsmoh.html#wp1027441
01-24-2013 01:08 PM
Hi Joshua,
You are most correct my friend But I thought you may have
been using the same format as Paul noted;
"I've pre-converted the source to .wav (32-bit stereo)."
We've had the best results with 8-bit /mono
Cheers!
Rob
"Spend your life waiting,
for a moment that just don't come,
Well, don't waste your time waiting"
-Springsteen
01-24-2013 01:11 PM
Oh gotcha. Thanks for getting my wheels spinning on the format types. I've actually tried 16-bit mono PCM. I'll give 8-bit a go and see if it helps.
-Joshua
02-04-2013 11:16 PM
We have tried a few more format combinations and found the sampling rate was our issue. Our music files were originally sampled at 44kHz and UCM was not converting them well. We have since dropped them to 16kHz. It seems that UCM handles the 16kHz files better as we no longer have the crackling noise in the resulting files.
Message was edited by: Joshua Learn
Message was edited by: Joshua Learn
02-05-2013 05:47 AM
Hi Joshua,
Thanks for posting back with your results here +5
This type of follow-up is most helpful to others here @ CSC.
Cheers!
Rob
"Clocks go slow in a place of work
Minutes drag and the hours jerk"
-The Clash
04-21-2022 10:04 AM
There is a bug about that: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvb89840
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