File Conversion

[John Huthmaker]

Hey Everyone,

I wanted to follow up on a question I had about converting from G729 to a usuable format.  I contacted "Voice Age Corporation" and they provided me with a non commercial version of the G.729 codec.  With that I was able to convert my files back over to standard wav format.  The only issue is that at 30 seconds (and presumably 60 and 90, etc) it inserts an annoying beep.  Since that only affected a handful of files, I just used Audacity to strip out the beep.

Now, I have a new question.  I have found lots of utilities online that can convert from wav to ulaw, but most of them are highly distored.  Using the Music on Hold in Call Manager does produce very high quality output.  However, since I have around 200 files, it's just not feasible.  Does anyone know of a good program to convert from standard wav to G.711.

I have usable files now, so I just need a program to get them in to a format I want.  I'm willing to pay for it.

Thanks,
John

[david.macias]

Can you tell me more about this tool?  Curious how it works.  To answer your question see here:

https://supportforums.cisco.com/message/3525969#3525969

david

[John Huthmaker]

To go from G.729 to Wave I did the following:

Installed the codec I was provided by Voice Age.  You can find their contact info at http://www.voiceage.com.

With the codec installed, my computer could now play the files natively.  I then downloaded a trial of Audiolib and then batch converted every file back to standard wave.  They are at http://audiolib.com/.

Then to remove the beep at the 30 second marker, I used audacity.  This only affected a handful of files.  It of course creates a small cut in the file, but at least I dont have an annoying beep anymore.

I still need to find a way to get them in to G.711, but my major problem is solved.  Now I can play my files back on my computer.  Before that I had 200 files that I couldnt do anything with.

[david.macias]

Cool, thank you for the information.

david

[Jonathan Schulenberg]

Audacity can save the file in G.711 u-law format.

1. Choose File > Export
2. Open the Format dropdown box in the Export dialog and choose Other uncompressed formats
3. Click the Options button. Set the Header to be WAV (Microsoft) and Encoding to U-law.
4. Click OK.
5. Name your file and click Save.
6. Repeat (or perhaps figure out how to batch this in Audacity).

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