I see UE4 mentioned in your MCD broadcasts

ffplay version n7.0.1 Copyright (c) 2003-2024 the FFmpeg developers
  built with gcc 14.1.1 (GCC) 20240522
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  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
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Input #0, mp3, from 'https://assets.scratch.mit.edu/13b59edbbf25d822fc965e6a6bc1bf93.mp3':
  Metadata:
    ENCODER         : UnrealEngine4
  Duration: 00:01:21.27, start: 0.025057, bitrate: 172 kb/s
  Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 172 kb/s
      Metadata:
        encoder         : LAME3.100