Sau khi xem sources của video: "https://www.youtube.com/watch?v=1wYNFfgrXTI"

Mình thấy nó co link:     "https://r5---sn-42u-i5ok.googlevideo.com/videoplayback?keepalive=yes&ipbits=0&mm=31&mn=sn-42u-i5ok&requiressl=yes&expire=1514819656&clen=16283240&ei=6PtJWv7oD8Wj4gKO74-IDQ&ms=au&mt=1514797957&mv=m&source=youtube&pl=46&gir=yes&initcwndbps=966250&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&mime=video%2Fmp4&aitags=133%2C134%2C135%2C160%2C242%2C243%2C244%2C278&dur=368.618&lmt=1458181494693762&ip=2405%3A4800%3A171e%3Ae8f1%3A50d5%3Ad187%3Aeb03%3A6a36&key=yt6&id=o-AJTIVlFGZ7VA0i_MrKMKOSPXOUHGmqI_6D9uqNWk-drQ&beids=%5B9466591%5D&itag=134\u0026s=610D10349D6CC63910EAEA6F952609FFAE4C4223885.CD3B440FD5E8185BF7A2723BF5A7715CEAC59881\u0026index=709-1568\u0026xtags=\u0026size=640x360\u0026lmt=1458181494693762\u0026projection_type=1\u0026bitrate=640890\u0026itag=134\u0026clen=16283240\u0026quality_label=360p\u0026fps=24\u0026init=0-708,type=video/webm;"

Vậy có thể làm cách nào để download video này k ạ?  mong mọi người giúp đỡ !!