Media

Bilingual Subtitle Merger

Merge two single-language subtitle files (SRT or WebVTT) into one bilingual track — primary language on top, secondary below — aligning cues by time overlap or cue index.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/bilingual-subtitle-merger' \
  -H 'Content-Type: application/json' \
  -d '{"primaryText":"1\n00:00:01,000 --> 00:00:03,000\n你好，世界\n\n2\n00:00:04,000 --> 00:00:06,000\n今天天气很好\n\n3\n00:00:08,000 --> 00:00:10,000\n再见","secondaryText":"1\n00:00:01,100 --> 00:00:03,100\nHello, world\n\n2\n00:00:04,000 --> 00:00:06,200\nThe weather is nice today\n\n3\n00:00:08,200 --> 00:00:10,000\nGoodbye","alignmentMode":"overlap","timingSource":"primary","maxGapMs":500,"outputFormat":"srt"}'

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/bilingual-subtitle-merger

Parameters

Name	Type	Required	Description
primaryText	textarea	Yes	—
secondaryText	textarea	Yes	—
alignmentMode	select	No	—
timingSource	select	No	—
maxGapMs	number	No	—
outputFormat

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-bilingual-subtitle-merger": {
      "name": "bilingual-subtitle-merger",
      "description": "Merge two single-language subtitle files (SRT or WebVTT) into one bilingual track — primary language on top, secondary below — aligning cues by time overlap or cue index.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=bilingual-subtitle-merger",
      "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": "bilingual-subtitle-merger",
    "arguments": {
  "primaryText": "1\n00:00:01,000 --> 00:00:03,000\n你好，世界\n\n2\n00:00:04,000 --> 00:00:06,000\n今天天气很好\n\n3\n00:00:08,000 --> 00:00:10,000\n再见",
  "secondaryText": "1\n00:00:01,100 --> 00:00:03,100\nHello, world\n\n2\n00:00:04,000 --> 00:00:06,200\nThe weather is nice today\n\n3\n00:00:08,200 --> 00:00:10,000\nGoodbye",
  "alignmentMode": "overlap",
  "timingSource": "primary",
  "maxGapMs": 500,
  "outputFormat": "srt"
}
  }
}