Uploaded November 2013 | Updated September 2026, 4 hours ago

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x264 at 3K res, no B frames, 2 keyframes per second, rendered at only 10Mbit/s.
This size enables the resolution option above 1080p, which sometimes shows as "Original", sometimes "4K", sometimes "1440p". It looks like YouTube recompresses the audio, but video pretty much retains original quality.