G.721 ADPCM Audio
|Developer||International Telegraph Union|
3.0 | 1 Vote
What is a G721 file?
A G721 file is an audio file saved using the G.721 codec, which was created by the International Telegraph Union (ITU). It contains 8kHz ADPCM audio transmitted at 32 kbit/s. Typically, G721 files contain spoken audio.
The ITU is a division of the United Nations responsible for coordinating the world's response to communication technology issues. Among other things, the ITU creates standards for saving and transmitting audio. The G.721 codec, which was released in 1984, is one such standard.
G.721 has since been superseded by the G.726 standard. As a result, you are unlikely to encounter G721 files.
How to open a G721 file
You can use FFmpeg (multiplatform) or libsndfile (multiplatform) to play the audio a G721 file contains.