To extract ac3 audio from flv video format :

1. Upload your flv file.
2. Select audio ac3 format from conversion list.
3. Enter a valid email address to get notified when the file is converted.

Also you can change the output audio setting for ac3 file, like audio bitrate, sampling rate, audio channels 'mono or stereo', and you can trim specific section of music. To know more about our audio edit experience, please go to Online Audio Converter page.