The video formats supported by the ultra-thin ipod nano are: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3 and 4, Audible Enhanced Audio, AAX and AAX+), Apple Lossless, AIFF and WAV mp3 formats will be automatically converted to WMMP when imported. If you want to buy an ipod to listen to the sound quality, just choose a cd and import it directly. If you choose Apple Losslessnano5 as the format, you can use the format factory to directly convert it into nano, and you don't need to adjust it yourself.