Unsupported media type m.audio

[jtagcat]

Discord -> Matrix -> Telegram relay channels. Discord -> Matrix is bridged fine.

{
  "content": {
    "body": "redacted1.wav",
    "fi.mau.discord.guild_member_metadata": {
      "avatar_id": "",
      "avatar_mxc": "",
      "avatar_url": "",
      "nick": ""
    },
    "info": {
      "mimetype": "audio/wav",
      "size": 801164
    },
    "m.mentions": {},
    "msgtype": "m.audio",
    "url": "mxc://redacted2.tld/sjtwmCaMdQBbJWuOlTeYTGIx"
  },
  "event_id": "$VJZftujKdle8oV7QwrfBwPghVyjnauvCOB7huECCa0Q",
  "origin_server_ts": 1782957493063,
  "sender": "@discord_redacted3:redacted2.tld",
  "type": "m.room.message",
  "unsigned": {
    "age": 25419708,
    "membership": "join"
  }
}

⚠️ Your message was not bridged: unsupported media type (audio/wav in m.audio)

{
  "age": 164842341,
  "content": {
    "body": "redacted4.mp3",
    "fi.mau.discord.guild_member_metadata": {
      "avatar_id": "",
      "avatar_mxc": "",
      "avatar_url": "",
      "nick": ""
    },
    "info": {
      "mimetype": "audio/mpeg3",
      "size": 762833
    },
    "m.mentions": {},
    "msgtype": "m.audio",
    "url": "mxc://redacted2.tld/uJWwapxUYIXXaAKSXiKKrTwv"
  },
  "event_id": "$MOq69dPIgWleloRcbpqiU_hRmQNOgG2HsTfE88n00YM",
  "origin_server_ts": 1782818092318,
  "room_id": "!pRObFIUDVcVsiwIOLY:redacted5.tld",
  "sender": "@discord_1231667610400063569:redacted2.tld",
  "type": "m.room.message",
  "unsigned": {
    "age": 164842341,
    "membership": "join"
  },
  "user_id": "@discord_redacted6:c7.ee"
}

⚠️ Your message was not bridged: unsupported media type (audio/mpeg3 in m.audio)

INF Initializing bridge built_at=2026-06-22T09:20:41Z go_version=go1.26.4 name=mautrix-telegram version=v26.06+dev.5bfc5bb0             

Worked before for years. Didn't know about it sooner since tg side is not notified of failed (discord ->) matrix -> telegram bridges.

Last bridged mp3 at 2026-06-04
First unbridged mp3 at 2026-06-05
Last bridged wav at 2026-03-21
First unbridged wav at 2026-04-?? (gave up on finding the exact date, Fractal froze at least 8 times)

Checklist

• This is an actual bug, not just a setup issue (see the troubleshooting docs or ask in the Matrix room for setup help).
• I am certain that sufficient information is included. Ask in the Matrix room first if not.
• The bug is still present on the main branch. The !tg version command output is: [mautrix-telegram](https://github.com/mautrix/telegram) v26.06+dev.[5bfc5bb0](https://github.com/mautrix/telegram/commit/5bfc5bb0cf365783daaf65453161e4a012d59719) (Mon, 22 Jun 2026 09:20:41 UTC)