Choose the audio output
Use MP3 for general sharing, M4A for Apple-friendly audio, WAV for editing, and FLAC when you want a lossless-style output from the available source audio.
Common video-to-audio tasks
MP4 to MP3 is the most common. MOV to MP3 helps with iPhone or QuickTime videos. WebM to MP3 helps with browser downloads and web clips.
Check the result
Listen to the start and end of the audio file. Make sure the duration matches what you expected and the audio was not muted in the original video.