Youtube offers various codecs, also including VP8 at all resolution/framerate settings H.264 is offered on (not all formats will always be available). For examp

Youtube offers various codecs, also including VP8 at all resolution/framerate settings H.264 is offered on (not all formats will always be available). For example, here's the youtube-dl format list for a well-known video: [youtube] dQw4w9WgXcQ: Downloading webpage [info] Available formats for dQw4w9WgXcQ: format code extension resolution note 249 webm audio only tiny 49k , opus @ 50k (48000Hz), 1.18MiB 250 webm audio only tiny 65k , opus @ 70k (48000Hz), 1.55MiB 140 m4a audio only tiny 130k , m4a_dash container, mp4a.40.2@128k (44100Hz), 3.27MiB 251 webm audio only tiny 136k , opus @160k (48000Hz), 3.28MiB 394 mp4 256x144 144p 73k , av01.0.00M.08, 25fps, video only, 1.72MiB 278 webm 256x144 144p 97k , webm container, vp9, 25fps, video only, 2.25MiB 160 mp4 256x144 144p 107k , avc1.4d400c, 25fps, video only, 2.05MiB 395 mp4 426x240 240p 159k , av01.0.00M.08, 25fps, video only, 3.42MiB 242 webm 426x240 240p 217k , vp9, 25fps, video only, 4.04MiB 133 mp4 426x240 240p 290k , avc1.4d4015, 25fps, video only, 4.48MiB 396 mp4 640x360 360p 340k , av01.0.01M.08, 25fps, video only, 6.68MiB 243 webm 640x360 360p 396k , vp9, 25fps, video only, 6.96MiB 134 mp4 640x360 360p 484k , avc1.4d401e, 25fps, video only, 8.27MiB 244 webm 854x480 480p 586k , vp9, 25fps, video only, 10.03MiB 397 mp4 854x480 480p 603k , av01.0.04M.08, 25fps, video only, 11.37MiB 135 mp4 854x480 480p 741k , avc1.4d401e, 25fps, video only, 11.56MiB 247 webm 1280x720 720p 1035k , vp9, 25fps, video only, 17.67MiB 136 mp4 1280x720 720p 1077k , avc1.4d401f, 25fps, video only, 16.72MiB 398 mp4 1280x720 720p 1133k , av01.0.05M.08, 25fps, video only, 22.07MiB 399 mp4 1920x1080 1080p 2106k , av01.0.08M.08, 25fps, video only, 40.74MiB 248 webm 1920x1080 1080p 2666k , vp9, 25fps, video only, 58.46MiB 137 mp4 1920x1080 1080p 4640k , avc1.640028, 25fps, video only, 78.96MiB 18 mp4 640x360 360p 601k , avc1.42001E, 25fps, mp4a.40.2@ 96k (44100Hz), 15.19MiB (best)