Get proper download link?

[ScarAce1989]

Hello,

I want to download this video:
https://megogo.net/ru/view/2260131-d...-seriya-5.html (You need a Russian VPN to view the video).

I downloaded the Manifest.mpd file
I found the best video and audio:
Video: https://vs821.vcdn.biz/845f859be63f0...i786860541.m4s
Audio: https://vs821.vcdn.biz/845f859be63f0...i786860621.m4s

I then tried to download it using youtube-dl and ffmpeg

youtube-dl https://vs821.vcdn.biz/845f859be63f061f21465b99d56e70d6_megogo/vod/mpd/o/36134821/u_sid/lgblk3goq5scas2ncdq4q2b567/u_uid/0/u_vod/3/u_device/html5/g/ru/media-i786860541.m4s

ffmpeg -i https://vs821.vcdn.biz/845f859be63f061f21465b99d56e70d6_megogo/vod/mpd/o/36134821/u_sid/lgblk3goq5scas2ncdq4q2b567/u_uid/0/u_vod/3/u_device/html5/g/ru/media-i786860541.m4s -c copy "video output.mp4"

And I also tried other option and output settings.

What I get is a 'video' file and when I open it I don't get the proper video, just this:
http://imgur.com/a/Kg9uy

Also the audio isn't working either.

I'm not experienced in this kind of stuff, so I hope some one will help me out.