LayoutTests/imported/w3c/web-platform-tests/media-source/webm/test-a-1s.webm-manifest.json

{
    "url": "webm/test-a-1s.webm",
    "init": {
        "offset": 0,
        "size": 600
    },
    "media": [
        {
            "offset": 600,
            "size": 7880,
            "timestamp": 0.0
        }
    ]
}