Media decoding capabilities

media.decoding-capabilities

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// Test source pending.

Definition

Queries supported, smooth and power-efficient responses for bounded media configurations.

Find it in the repository

Collector source: core/signals/video/decoding-capabilities.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/media/decoding-capabilities.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: media.decoding-capabilities
Collector: media.decoding-capabilities
API / surface: core/signals/video/decoding-capabilities.ts
Timeout: 1750 ms
Companion signals: None
Fixture inputs: Inline owned corpora (listed below)

core/fixtures/media/configuration.ts · sha256:5798c6f0e414d34f43b677c3a722f171828509ab2b884c206d3c71c685eb0f81

Exact request inputs

[
  {
    "key": "media.decoding-capabilities.responses",
    "inputs": {
      "codec-0": {
        "type": "file",
        "video": {
          "contentType": "video/webm; codecs=\"av01.0.04M.08\"",
          "width": 640,
          "height": 360,
          "bitrate": 500000,
          "framerate": 30
        }
      },
      "codec-1": {
        "type": "file",
        "video": {
          "contentType": "video/webm; codecs=\"vp8\"",
          "width": 640,
          "height": 360,
          "bitrate": 500000,
          "framerate": 30
        }
      },
      "codec-2": {
        "type": "file",
        "video": {
          "contentType": "video/webm; codecs=\"vp09.00.10.08\"",
          "width": 640,
          "height": 360,
          "bitrate": 500000,
          "framerate": 30
        }
      },
      "codec-3": {
        "type": "file",
        "video": {
          "contentType": "video/mp4; codecs=\"avc1.42E01E\"",
          "width": 640,
          "height": 360,
          "bitrate": 500000,
          "framerate": 30
        }
      },
      "codec-4": {
        "type": "file",
        "video": {
          "contentType": "video/mp4; codecs=\"hvc1.1.6.L93.B0\"",
          "width": 640,
          "height": 360,
          "bitrate": 500000,
          "framerate": 30
        }
      },
      "vp9-large": {
        "type": "file",
        "video": {
          "contentType": "video/webm; codecs=\"vp09.00.10.08\"",
          "width": 1920,
          "height": 1080,
          "bitrate": 4000000,
          "framerate": 30
        }
      },
      "source-unusual-audio-rate": {
        "type": "file",
        "audio": {
          "contentType": "audio/webm; codecs=\"opus\"",
          "channels": "2",
          "bitrate": 128000,
          "samplerate": 5200
        }
      },
      "invalid-control": {
        "type": "invalid",
        "video": {
          "contentType": "invalid",
          "width": 0,
          "height": 0,
          "bitrate": 0,
          "framerate": 0
        }
      }
    },
    "controls": {}
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/media.decoding-capabilities. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/video/decoding-capabilities"

const signal = measurementModule
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts