i recommend bigasoft Youtube downloader pro
with it, bạn can easily achieve:
Download YouTube video, âm nhạc video in HD 1080p/720p, 3D hoặc stand definition 360p/480p
Download video from all được ưa chuộng 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 được ưa chuộng video formats including MP4, AVI, MPG, WMV hoặc HD MP4 (H.264, Xvid), HD AVI (Xvid), DV, ProRes, 3GP, MOV, MKV, VOB, RMVB and etc
Fast download and convert YouTube video, âm nhạc video to all được ưa chuộng 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 bởi step guide on how to use it at
link