The version on youtube is 20.48GiB(!) so I hope it's the best possible quality.

  Input #0, matroska,webm:
    Metadata:
      ENCODER         : Lavf59.27.100
    Duration: 03:02:38.36, start: -0.007000, bitrate: 11990 kb/s
    Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 3840x2160, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 1k tbn (default)
      Metadata:
        DURATION        : 03:02:38.333000000
    Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
      Metadata:
        DURATION        : 03:02:38.361000000