Media

MP3 to Opus Converter

Convert MP3 audio to Opus with bitrate, resampling, and channel options

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Upload each file first → returns { filePath }
curl -X POST 'https://api.elysiatools.com/upload/mp3-to-opus' \
  -F 'file=@/path/to/audioFile.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/mp3-to-opus' \
  -F 'audioFile=/path/to/file.ext' \
  -F 'bitrate=128' \
  -F 'sampleRate=48000' \
  -F 'channels=auto' \
  -F 'keepMetadata=true'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/mp3-to-opus

Parameters

Name	Type	Required	Description
audioFile	fileupload required	Yes	Select the source audio file
bitrate	select	No	—
sampleRate	select	No	—
channels	select	No	—
keepMetadata	checkbox	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-mp3-to-opus": {
      "name": "mp3-to-opus",
      "description": "Convert MP3 audio to Opus with bitrate, resampling, and channel options",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=mp3-to-opus",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "mp3-to-opus",
    "arguments": {
  "audioFile": "https://example.com/file.ext",
  "bitrate": "128",
  "sampleRate": "48000",
  "channels": "auto",
  "keepMetadata": true
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

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