Agree. There are many online video to audio converters you can use. But my favorite is Joyoshare VidiKit. Its video converter can not only convert between videos and audios, supporting over 150 formats, but also offer a built-in video editor that enables you to adjust video parameters such as bitrate, frame rate, resolution as well as codec, crop, cut, trim, split, rotate videos, add watermarks, apply special effects, and more.