En effet, ca apparait comme VP9.2 :
[youtube] tO01J-M3g0U: Downloading webpage
[youtube] tO01J-M3g0U: Downloading video info webpage
[youtube] tO01J-M3g0U: Extracting video information
[youtube] tO01J-M3g0U: Downloading MPD manifest
[info] Available formats for tO01J-M3g0U:
format code extension resolution note
....
330 webm 256x144 144p60 156k , vp9.2, 60fps, video only, 2.38MiB
331 webm 426x240 240p60 256k , vp9.2, 60fps, video only, 3.87MiB
332 webm 640x360 360p60 485k , vp9.2, 60fps, video only, 7.35MiB
333 webm 854x480 480p60 909k , vp9.2, 60fps, video only, 13.83MiB
334 webm 1280x720 720p60 1991k , vp9.2, 60fps, video only, 28.18MiB
335 webm 1920x1080 1080p60 3201k , vp9.2, 60fps, video only, 49.70MiB
336 webm 2560x1440 1440p60 11166k , vp9.2, 60fps, video only, 170.23MiB
337 webm 3840x2160 2160p60 20122k , vp9.2, 60fps, video only, 335.45MiB