i recommend bigasoft Youtube downloader pro
with it, wewe can easily achieve:
Download YouTube video, muziki video in HD 1080p/720p, 3D au stand definition 360p/480p
Download video from all maarufu video sites like Facebook, Google Videos, Metacafe, eHow, Vimeo, MTV, BBC, Dailymotion, etc.
One-step download and convert YouTube video and other online video to almost all maarufu video formats including MP4, AVI, MPG, WMV au HD MP4 (H.264, Xvid), HD AVI (Xvid), DV, ProRes, 3GP, MOV, MKV, VOB, RMVB and etc
Fast download and convert YouTube video, muziki video to all maarufu audio formats like M4A, WAV, WMA, AIFF, FLAC, AAC, MP3, AC3, OGG, RA, MP2 and etc.
Windows version at
link Mac version at
link Step kwa step guide on how to use it at
link