The phone supports a wide variety of audio formats including MP3, Podcasts, Audiobooks, MP4, AAC, RealAudio (.ra, .rm), WMA, XMF, M4A, WAV and midi. Video formats include MPEG4 (MP4 with AAC or AMR audio), 3GPP, WMV (.asf, .wmv) and RealVideo 8 (.rv, .rm). The K850i supports OMA DRM 1.0 and 2.0 for copy protected music, video and Java applications. Audi quality through stereo earbuds and even stereo Bluetooth headsets is excellent, with good stereo separation, strong bass (even stronger if you turn on Megabass) and clear highs. The phone definitely makes a good iPod substitute when used with a 2 or 4 gig card. We loaded a 4 gig microSD card with songs and ran the player for 6 hours with plenty of battery left to spare.
I use this converter:pavtube video converter