MP3 Mono improperly reports as unsupported

[Artiume]

Describe the bug

MP3 1 Ch is transcoded while it is natively supported. Both Firefox and Chrome in Playback Stats report that the audio codec isn't supported. Oddly enough, Chrome will say Mp3 (direct) in the Playback report.

To Reproduce Attempt to play mp3 mono, it will transcode to AAC 1 ch for Firefox

Expected behavior

Native support or at least consistent behavior.

Logs

Input #0, avi, from 'file:/media/tv/Bonanza/Season 2/Bonanza - S02E01 - Showdown DVD.avi':
  Metadata:
    encoder         : VirtualDubMod 1.5.10.2 (build 2540/release)
  Duration: 00:49:55.04, start: 0.000000, bitrate: 978 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 576x432 [SAR 1:1 DAR 4:3], 873 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, mono, fltp, 92 kb/s

Chrome

Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)

Firefox

Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (mp3 (mp3float) -> aac (native))

[Artiume]

Chromium:

Transcoding Progress is at 113%... but that's a problem for another day.

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[Artiume]

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