If you want to extract audio tracks (.mp3) from a video, please see the manual below:
1. Download Bandicut from the official website (https://www.bandicam.com/bandicut-video-cutter/download/).
2. Start Bandicut and click the 'Cut' button.
3. Select the video, and click the 'Open' button.
4. Set the beginning/ending point of the video and click the 'Start' button.
5. Check the "Extract audio tracks (.mp3)" option and click the 'Start' button.
6. Click the 'Open' button to check the extracted .mp3 files.
If there are more than 2 audio streams, the "Save Tracks" menu will be shown.
To extract a specific audio track, choose the "Save only selected video and audio tracks" option and check "Extract audio tracks(.mp3)".