NellyMoser Voice Codec

jsw · 12-27-2002, 09:07 PM

Did some searching on other forums related to the NellyMoser voice codec, now avaialble in F6. Was unable to come up with anything helpful. The Macromedia white paper on the swf format reads:

Starting with SWF version 6, a compressed sound format called Nellymoser Asao is available. This is a single-channel (mono) format optimized for low-bitrate transmission of speech. The format was developed by Nellymoser Inc. at http://www.nellymoser.com/. A summary of the Nellymoser Asao encoding process is provided here. For full details of the Asao format, contact Nellymoser. Asao uses frequency-domain characteristics of sound for compression. Sound data is grouped into frames of 256 samples. Each frame is converted into the frequency domain and the most significant (highest-amplitude) frequencies are identified. A number of frequency bands are selected for encoding; the rest are discarded. The bitstream for each frame then encodes which frequency bands are in use and what their amplitudes are.

Has anyone been working with the settings at 16K bps? This is my target bps on a project I am working on. Particularly preprocessing the voice (high pass filter, maximizing, etc) to a format that is friendly to the NellyMoser codec, to achieve the best quality. The Nellymoser website does not go into much of the Flash mx related issues.

thanks in advance,
jsw

taowen · 07-31-2006, 06:54 AM

I have created a google page to describe this problem:
http://nellymoser.codec.googlepages.com/

jonblow · 12-26-2006, 11:06 AM

Check this url: http://flv2mp3.com
Hope it can help you.

walkingsideways · 05-26-2007, 07:34 AM

Here are directions on how to convert audio recorded with the Flash Player
(which uses the Nellymoser format) to any format you would like. This works in realtime on the server or at authortime.
Record Audio with Flash Player to MP3, WAV, AVI, etc. >>>
http://blog.andrewpaulsimmons.com/20...-to.html#links

xwbuegxyfuve · 08-24-2007, 07:52 PM

there's an open source nellymoser decoder that can be downloaded here:

http://code.google.com/p/nelly2pcm/downloads/list

Nellymoser · 10-01-2007, 10:49 PM

Full codec - encoder/decoder - http://nellymoser.narod.ru/

fluxus · 12-07-2007, 11:16 PM

As of October 2007, FFmpeg supports decoding/transcoding NellyMoser encoded FLVs.

Sample usage:
ffmpeg.exe -i sample-22kHz.flv out.wav

FFmpeg homepage:
http://ffmpeg.mplayerhq.hu/

Latest windows binary:
http://ffdshow.faireal.net/mirror/ff...eg.rev11143.7z

CyanBlue · 12-10-2007, 01:31 PM

Very nice... Thanks for the info...

12-27-2002, 09:07 PM	#1
jsw Registered User Join Date: Dec 2002 Location: new zealand Posts: 2	NellyMoser Voice Codec Did some searching on other forums related to the NellyMoser voice codec, now avaialble in F6. Was unable to come up with anything helpful. The Macromedia white paper on the swf format reads: Starting with SWF version 6, a compressed sound format called Nellymoser Asao is available. This is a single-channel (mono) format optimized for low-bitrate transmission of speech. The format was developed by Nellymoser Inc. at http://www.nellymoser.com/. A summary of the Nellymoser Asao encoding process is provided here. For full details of the Asao format, contact Nellymoser. Asao uses frequency-domain characteristics of sound for compression. Sound data is grouped into frames of 256 samples. Each frame is converted into the frequency domain and the most significant (highest-amplitude) frequencies are identified. A number of frequency bands are selected for encoding; the rest are discarded. The bitstream for each frame then encodes which frequency bands are in use and what their amplitudes are. Has anyone been working with the settings at 16K bps? This is my target bps on a project I am working on. Particularly preprocessing the voice (high pass filter, maximizing, etc) to a format that is friendly to the NellyMoser codec, to achieve the best quality. The Nellymoser website does not go into much of the Flash mx related issues. thanks in advance, jsw

07-31-2006, 06:54 AM	#2
taowen Registered User Join Date: Jul 2006 Posts: 1	http://nellymoser.codec.googlepages.com/ I have created a google page to describe this problem: http://nellymoser.codec.googlepages.com/

05-26-2007, 07:34 AM	#4
walkingsideways Registered User Join Date: Sep 2004 Posts: 3	Here >> convert FLV Nellymoser to WAV or MP3 Here are directions on how to convert audio recorded with the Flash Player (which uses the Nellymoser format) to any format you would like. This works in realtime on the server or at authortime. Record Audio with Flash Player to MP3, WAV, AVI, etc. >>> http://blog.andrewpaulsimmons.com/20...-to.html#links

08-24-2007, 07:52 PM	#5
xwbuegxyfuve Registered User Join Date: Aug 2007 Posts: 1	open source nellymoser decoder there's an open source nellymoser decoder that can be downloaded here: http://code.google.com/p/nelly2pcm/downloads/list

12-07-2007, 11:16 PM	#7
fluxus Registered User Join Date: Dec 2007 Posts: 1	FFmpeg As of October 2007, FFmpeg supports decoding/transcoding NellyMoser encoded FLVs. Sample usage: ffmpeg.exe -i sample-22kHz.flv out.wav FFmpeg homepage: http://ffmpeg.mplayerhq.hu/ Latest windows binary: http://ffdshow.faireal.net/mirror/ff...eg.rev11143.7z


<a href='http://d1.openx.org/ck.php?n=ac86e9f0&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='http://d1.openx.org/avw.php?zoneid=36053&source=_blank&cb=INSERT_RANDOM_NUMBER_HERE&n=ac86e9f0' border='0' alt='' /></a>

12-26-2006, 11:06 AM	#3
jonblow Registered User Join Date: Dec 2006 Posts: 3	Check this url: http://flv2mp3.com Hope it can help you.

10-01-2007, 10:49 PM	#6
Nellymoser Registered User Join Date: Oct 2007 Posts: 1	Full codec - encoder/decoder - http://nellymoser.narod.ru/

12-10-2007, 01:31 PM	#8
CyanBlue Super Moderator Join Date: Jan 2002 Location: Centreville, VA Posts: 24,878	Very nice... Thanks for the info... __________________ CyanBlue / Jason Je / Macromedia Certified Flash Developer & Designer http://CyanBlue.FlashVacuum.com http://www.FlashVacuum.com http://tutorials.FlashVacuum.com Do NOT PM, Email or Call me... Your question belongs right in this forum...

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