If you use youtube-dl there is a webm available
]$ youtube-dl -F youtube.com/watch?v=2kYQR9_WHMM
[youtube] 2kYQR9_WHMM: Downloading webpage
[youtube] 2kYQR9_WHMM: Downloading video info webpage
[youtube] 2kYQR9_WHMM: Extracting video information
[youtube] 2kYQR9_WHMM: Downloading MPD manifest
[info] Available formats for 2kYQR9_WHMM:
format code extension resolution note
249 webm audio only DASH audio 52k , opus @ 50k (48000Hz), 1.25MiB
250 webm audio only DASH audio 71k , opus @ 70k (48000Hz), 1.59MiB
171 webm audio only DASH audio 94k , [email protected]/* */ (44100Hz), 2.06MiB
140 m4a audio only DASH audio 127k , m4a_dash container, [email protected]/* */ (44100Hz), 3.11MiB
251 webm audio only DASH audio 146k , opus @160k (48000Hz), 2.98MiB
278 webm 256x144 DASH video 125k , webm container, vp9, 30fps, video only, 2.04MiB
160 mp4 256x144 DASH video 142k , avc1.4d400c, 30fps, video only, 2.72MiB
242 webm 426x240 DASH video 216k , vp9, 30fps, video only, 3.25MiB
133 mp4 426x240 DASH video 257k , avc1.4d4015, 30fps, video only, 5.94MiB
243 webm 640x360 DASH video 400k , vp9, 30fps, video only, 6.11MiB
134 mp4 640x360 DASH video 634k , avc1.4d401e, 30fps, video only, 8.00MiB
244 webm 854x480 DASH video 696k , vp9, 30fps, video only, 10.20MiB
135 mp4 854x480 DASH video 1162k , avc1.4d401f, 30fps, video only, 16.09MiB
247 webm 1280x720 720p 1443k , vp9, 30fps, video only, 21.95MiB
136 mp4 1280x720 720p 2313k , avc1.4d401f, 30fps, video only, 31.12MiB
302 webm 1280x720 DASH video 2456k , vp9, 60fps, video only, 31.56MiB
298 mp4 1280x720 DASH video 3467k , avc1.4d4020, 60fps, video only, 44.18MiB
17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k
36 3gp 320x180 small , mp4v.20.3, mp4a.40.2
43 webm 640x360 medium , vp8.0, [email protected]/* */
18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k
22 mp4 1280x720 hd720 , avc1.64001F, [email protected]/* */ (best)
Not normie tier, but it helps for backing everything up and does a shit load of other sites