4 ms·
"The necessary support of the VP9 video codec for 4K playback today seems to currently apply to videos being watched directly on YouTube’s site. A quick way to
by SG- 10y ago
"The necessary support of the VP9 video codec for 4K playback today seems to currently apply to videos being watched directly on YouTube’s site. A quick way to check is to launch an uploaded 4K video on YouTube, and attempt to change the resolution. Recently uploaded videos only show HD options up to 1440p in Safari. Interestingly, if these very videos are embedded on an external page, then 4K video playback is still an option."
So it looks like they're encoding h264 in 4K, just not if you're on the actual Youtube site.
- rasz_pl 10y agolets pray to formatting gods, : D:\_learning>youtube-dl.exe -F https://www.youtube.com/watch?v=4Twcx4QozRc https://www.youtube.com/watch?v=4Twcx4QozRc [youtube] 4Twcx4QozRc: Downloading webpage [youtube] 4Twcx4QozRc: Downloading video info webpage [youtube] 4Twcx4QozRc: Extracting video information [youtube] 4Twcx4QozRc: Downloading MPD manifest [info] Available formats for 4Twcx4QozRc: format code extension resolution note 249 webm audio only DASH audio 53k , opus @ 50k (48000Hz), 811.34KiB 250 webm audio only DASH audio 85k , opus @ 70k (48000Hz), 1.24MiB 140 m4a audio only DASH audio 95k , m4a_dash container, mp4a.40.2@128k (44100Hz), 1.47MiB 171 webm audio only DASH audio 104k , vorbis@128k (44100Hz), 1.44MiB 251 webm audio only DASH audio 127k , opus @160k (48000Hz), 1.86MiB 278 webm 256x144 DASH video 114k , webm container, vp9, 24fps, video only, 1.10MiB 160 mp4 256x144 DASH video 114k , avc1.4d400c, 24fps, video only, 1.67MiB 242 webm 426x240 DASH video 143k , vp9, 24fps, video only, 1.27MiB 243 webm 640x360 DASH video 248k , vp9, 24fps, video only, 2.22MiB 133 mp4 426x240 DASH video 260k , avc1.4d4015, 24fps, video only, 3.71MiB 134 mp4 640x360 DASH video 268k , avc1.4d401e, 24fps, video only, 3.23MiB 244 webm 854x480 DASH video 380k , vp9, 24fps, video only, 3.48MiB 135 mp4 854x480 DASH video 569k , avc1.4d401e, 24fps, video only, 6.62MiB 247 webm 1280x720 DASH video 761k , vp9, 24fps, video only, 6.77MiB 136 mp4 1280x720 DASH video 1101k , avc1.4d401f, 24fps, video only, 12.63MiB 248 webm 1920x1080 DASH video 1726k , vp9, 24fps, video only, 13.09MiB 137 mp4 1920x1080 DASH video 2324k , avc1.640028, 24fps, video only, 24.90MiB 271 webm 2560x1440 DASH video 4744k , vp9, 24fps, video only, 38.59MiB 264 mp4 2560x1440 DASH video 6415k , avc1.640032, 24fps, video only, 62.11MiB 266 mp4 3840x2160 DASH video 11632k , avc1.640033, 24fps, video only, 152.17MiB 313 webm 3840x2160 DASH video 16250k , vp9, 24fps, video only, 175.23MiB 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, vorbis@128k 18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k 22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best) so 4K is indeed just hidden in the YT player, but present in the manifest
- SG- 10y agointeresting that the file size for vp9/webm is usually smaller for all size options except for 4K where mp4/h264 seems smaller (at least for this specific video) meaning it's not really about trying to save bandwidth.