{
  "slug": "mp4-to-mkv",
  "name": "gizza-ai/mp4-to-mkv",
  "version": "0.1.0",
  "title": "Convert MP4 to MKV Online — gizza.ai",
  "description": "Free MP4 to MKV converter in your browser. Lossless stream-copy remux — keeps video, audio and subtitle tracks, nothing re-encoded or uploaded.",
  "tags": [
    "mp4",
    "mkv",
    "convert",
    "video",
    "remux",
    "stream-copy",
    "matroska",
    "lossless",
    "no-reencode"
  ],
  "category": "video",
  "urls": {
    "page": "https://gizza.ai/tools/mp4-to-mkv/",
    "markdown": "https://gizza.ai/tools/mp4-to-mkv/index.md",
    "descriptor": "https://gizza.ai/tools/mp4-to-mkv/tool.json",
    "deep_link_example": "https://gizza.ai/tools/mp4-to-mkv/?url=https://example.com/input"
  },
  "cli": "gizza tool mp4-to-mkv 'url=https://example.com/input'",
  "tool": {
    "description": "Remux an MP4 video into a Matroska (.mkv) container without re-encoding. Provide either url (HTTP/HTTPS) or ref (id from a prior tool call). Every stream (video, all audio tracks, subtitles, data) is stream-copied with -map 0 -c copy: lossless, near-instant, no quality change. MKV holds every codec MP4 can, so this always succeeds — moving to MKV lets you later add soft subtitles or extra audio tracks. To change codec/quality, use video-transcode instead.",
    "parameters": {
      "additionalProperties": false,
      "oneOf": [
        {
          "required": [
            "url"
          ]
        },
        {
          "required": [
            "ref"
          ]
        }
      ],
      "properties": {
        "ref": {
          "description": "Reference id from a prior tool call. Use either url or ref.",
          "type": "string"
        },
        "url": {
          "description": "Video URL (HTTP/HTTPS). Use either url or ref.",
          "type": "string"
        }
      },
      "type": "object"
    }
  }
}