GoodOk Video to Audio Converter is a powerful and professional video to audio conversion tool. It can help you extract audio from all popular video files such as AVI, WMV, MPEG, MP4, ASF, VOB, 3GP, iPhone, MOV, FLV, and save them as MP3, AAC, AC3, AMR, M4A, OGG and WAV audio format in batch mode. It offers you an easy way to convert video files to audio within a few clicks.