just a tip for dl'in youtube videos in linux
It may be an Android video and you want to keep it for reference
sudo apt-get install youtube-dl
youtube-dl -F {video URL}
youtube-dl -f {format code} {video URL}
youtube-dl -f 22
https://www.youtube.com/watch?v=FAeAp9MzPtk&list=RD_0R3I9xk3xo[info] Available formats for PquaLQmCL0Q:
format code extension resolution note
139 m4a audio only DASH audio , audio@ 48k (worst)
140 m4a audio only DASH audio , audio@128k
160 mp4 192p DASH video
133 mp4 240p DASH video
134 mp4 360p DASH video
135 mp4 480p DASH video
136 mp4 720p DASH video
17 3gp 176x144
36 3gp 320x240
5 flv 400x240
43 webm 640x360
18 mp4 640x360
22 mp4 1280x720 (best)