Flash Player clients, when recording audio from a user's microphone, can use the Nellymoser Asao codec.
[3]) The sampling rate of the audio capture can be controlled by the Flash programmer to increase and decrease encoding bitrate and quality.
[4][5][6] At the time of the release of Flash Player 6 in 2003, there was no free or open source software for encoding and decoding Nellymoser audio.
In 2008, this project was removed from Google Code in response to a complaint under the U.S. Digital Millennium Copyright Act.
[23][24][25] As of December 3, 2008, the open source FFmpeg project has encoding and decoding support for the Nellymoser Asao codec.