Input #0, matroska,webm, from 'Original.mkv':
  Metadata:
    ENCODER         : Lavf58.65.100
  Duration: 00:42:45.54, start: -0.007000, bitrate: 2521 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709/unknown/unknown, progressive), 1920x1080 [SAR
 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      ENCODER         : Lavc58.115.102 libx264
      DURATION        : 00:42:45.541000000
    Stream #0:1: Audio: opus, 48000 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : SoundHandler
      VENDOR_ID       : [0][0][0][0]
      ENCODER         : Lavc58.115.102 libopus
      DURATION        : 00:42:45.368000000
Input #1, matroska,webm, from 'YouTube Outro.mkv':
  Metadata:
    DATE            : 2021-03-10T23:13:19.647059
    ENCODER         : Lavf58.65.100
  Duration: 00:00:08.97, start: -0.007000, bitrate: 74 kb/s
    Stream #1:0: Video: h264 (High 4:4:4 Predictive), yuv444p(tv, progressive), 1920x1080, 29.97 fps, 29.
97 tbr, 1k tbn, 59.94 tbc (default)
    Metadata:
      ENCODER         : Lavc58.115.102 libx264
      DURATION        : 00:00:08.949000000
    Stream #1:1: Audio: opus, 48000 Hz, mono, fltp (default)
    Metadata:
      ENCODER         : Lavc58.115.102 libopus
      DURATION        : 00:00:08.968000000
At least one output file must be specified