Codec capabilities

media.codecs

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// Test source pending.

Definition

HTML and MSE playback responses and RTP sender/receiver codec parameters; video capability lists use semantic ordering, while audio retains returned order.

Find it in the repository

Collector source: core/signals/video/codecs.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/media/codecs.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.codecs
Collector: media.codecs
API / surface: core/signals/video/codecs.ts
Timeout: 500 ms
Companion signals: None
Fixture inputs: Declared requests (listed below)

Exact request inputs

[
  {
    "key": "media.codecs.html-audio",
    "inputs": {
      "html-audio/flac": {
        "mime": "audio/flac",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/mp4; codecs=\"mp4a.40.2\"": {
        "mime": "audio/mp4; codecs=\"mp4a.40.2\"",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/mpeg": {
        "mime": "audio/mpeg",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/ogg; codecs=\"opus\"": {
        "mime": "audio/ogg; codecs=\"opus\"",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/ogg; codecs=\"vorbis\"": {
        "mime": "audio/ogg; codecs=\"vorbis\"",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/vendor-invalid; codecs=\"invalid\"": {
        "mime": "audio/vendor-invalid; codecs=\"invalid\"",
        "kind": "audio",
        "invalidControl": true
      },
      "html-audio/wav; codecs=\"1\"": {
        "mime": "audio/wav; codecs=\"1\"",
        "kind": "audio",
        "invalidControl": false
      },
      "html-audio/webm; codecs=\"opus\"": {
        "mime": "audio/webm; codecs=\"opus\"",
        "kind": "audio",
        "invalidControl": false
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.mse-audio",
    "inputs": {
      "mse-audio/flac": {
        "mime": "audio/flac",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/mp4; codecs=\"mp4a.40.2\"": {
        "mime": "audio/mp4; codecs=\"mp4a.40.2\"",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/mpeg": {
        "mime": "audio/mpeg",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/ogg; codecs=\"opus\"": {
        "mime": "audio/ogg; codecs=\"opus\"",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/ogg; codecs=\"vorbis\"": {
        "mime": "audio/ogg; codecs=\"vorbis\"",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/vendor-invalid; codecs=\"invalid\"": {
        "mime": "audio/vendor-invalid; codecs=\"invalid\"",
        "kind": "audio",
        "invalidControl": true
      },
      "mse-audio/wav; codecs=\"1\"": {
        "mime": "audio/wav; codecs=\"1\"",
        "kind": "audio",
        "invalidControl": false
      },
      "mse-audio/webm; codecs=\"opus\"": {
        "mime": "audio/webm; codecs=\"opus\"",
        "kind": "audio",
        "invalidControl": false
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.html-video",
    "inputs": {
      "html-video/mp4; codecs=\"av01.0.04M.08\"": {
        "mime": "video/mp4; codecs=\"av01.0.04M.08\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/mp4; codecs=\"avc1.42E01E\"": {
        "mime": "video/mp4; codecs=\"avc1.42E01E\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/mp4; codecs=\"avc1.640028\"": {
        "mime": "video/mp4; codecs=\"avc1.640028\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/mp4; codecs=\"hvc1.1.6.L93.B0\"": {
        "mime": "video/mp4; codecs=\"hvc1.1.6.L93.B0\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/ogg; codecs=\"theora\"": {
        "mime": "video/ogg; codecs=\"theora\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/vendor-invalid; codecs=\"invalid\"": {
        "mime": "video/vendor-invalid; codecs=\"invalid\"",
        "kind": "video",
        "invalidControl": true
      },
      "html-video/webm; codecs=\"vp09.00.10.08\"": {
        "mime": "video/webm; codecs=\"vp09.00.10.08\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/webm; codecs=\"vp8\"": {
        "mime": "video/webm; codecs=\"vp8\"",
        "kind": "video",
        "invalidControl": false
      },
      "html-video/webm; codecs=\"vp9\"": {
        "mime": "video/webm; codecs=\"vp9\"",
        "kind": "video",
        "invalidControl": false
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.mse-video",
    "inputs": {
      "mse-video/mp4; codecs=\"av01.0.04M.08\"": {
        "mime": "video/mp4; codecs=\"av01.0.04M.08\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/mp4; codecs=\"avc1.42E01E\"": {
        "mime": "video/mp4; codecs=\"avc1.42E01E\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/mp4; codecs=\"avc1.640028\"": {
        "mime": "video/mp4; codecs=\"avc1.640028\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/mp4; codecs=\"hvc1.1.6.L93.B0\"": {
        "mime": "video/mp4; codecs=\"hvc1.1.6.L93.B0\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/ogg; codecs=\"theora\"": {
        "mime": "video/ogg; codecs=\"theora\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/vendor-invalid; codecs=\"invalid\"": {
        "mime": "video/vendor-invalid; codecs=\"invalid\"",
        "kind": "video",
        "invalidControl": true
      },
      "mse-video/webm; codecs=\"vp09.00.10.08\"": {
        "mime": "video/webm; codecs=\"vp09.00.10.08\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/webm; codecs=\"vp8\"": {
        "mime": "video/webm; codecs=\"vp8\"",
        "kind": "video",
        "invalidControl": false
      },
      "mse-video/webm; codecs=\"vp9\"": {
        "mime": "video/webm; codecs=\"vp9\"",
        "kind": "video",
        "invalidControl": false
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.rtp-sender-audio",
    "inputs": {
      "rtp-sender-audio": {
        "kind": "audio",
        "direction": "sender"
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.rtp-receiver-audio",
    "inputs": {
      "rtp-receiver-audio": {
        "kind": "audio",
        "direction": "receiver"
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.rtp-sender-video",
    "inputs": {
      "rtp-sender-video": {
        "kind": "video",
        "direction": "sender"
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.rtp-receiver-video",
    "inputs": {
      "rtp-receiver-video": {
        "kind": "video",
        "direction": "receiver"
      }
    },
    "controls": {}
  },
  {
    "key": "media.codecs.grammar",
    "inputs": {
      "html-video/mp4; codecs=\"avc1.42C01E\"": {
        "mime": "video/mp4; codecs=\"avc1.42C01E\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "exact-owned-profile",
        "executionJoin": {
          "signal": "video.codec-realization",
          "fixture": "h264",
          "mime": "video/mp4; codecs=\"avc1.42C01E\""
        },
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"avc1.42C01E\"": {
        "mime": "video/mp4; codecs=\"avc1.42C01E\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "exact-owned-profile",
        "executionJoin": {
          "signal": "video.codec-realization",
          "fixture": "h264",
          "mime": "video/mp4; codecs=\"avc1.42C01E\""
        },
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"hvc1.1.6.L93.90\"": {
        "mime": "video/mp4; codecs=\"hvc1.1.6.L93.90\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "exact-owned-profile",
        "executionJoin": {
          "signal": "video.codec-realization",
          "fixture": "hevc",
          "mime": "video/mp4; codecs=\"hvc1.1.6.L93.90\""
        },
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"hvc1.1.6.L93.90\"": {
        "mime": "video/mp4; codecs=\"hvc1.1.6.L93.90\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "exact-owned-profile",
        "executionJoin": {
          "signal": "video.codec-realization",
          "fixture": "hevc",
          "mime": "video/mp4; codecs=\"hvc1.1.6.L93.90\""
        },
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4": {
        "mime": "video/mp4",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "container-only",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4": {
        "mime": "video/mp4",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "container-only",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"hev1\"": {
        "mime": "video/mp4; codecs=\"hev1\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "incomplete-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"hev1\"": {
        "mime": "video/mp4; codecs=\"hev1\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "incomplete-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"hvc1x\"": {
        "mime": "video/mp4; codecs=\"hvc1x\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "malformed-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"hvc1x\"": {
        "mime": "video/mp4; codecs=\"hvc1x\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "malformed-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"avc1\"": {
        "mime": "video/mp4; codecs=\"avc1\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "incomplete-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"avc1\"": {
        "mime": "video/mp4; codecs=\"avc1\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "incomplete-identifier",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"avc1.42E01F\"": {
        "mime": "video/mp4; codecs=\"avc1.42E01F\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "valid-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"avc1.42E01F\"": {
        "mime": "video/mp4; codecs=\"avc1.42E01F\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "valid-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"avc1.64001F\"": {
        "mime": "video/mp4; codecs=\"avc1.64001F\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "valid-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"avc1.64001F\"": {
        "mime": "video/mp4; codecs=\"avc1.64001F\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "valid-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/webm; codecs=\"hvc1.1.6.L93.B0\"": {
        "mime": "video/webm; codecs=\"hvc1.1.6.L93.B0\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "container-codec-mismatch",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/webm; codecs=\"hvc1.1.6.L93.B0\"": {
        "mime": "video/webm; codecs=\"hvc1.1.6.L93.B0\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "container-codec-mismatch",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-video/mp4; codecs=\"avc1.invalid\"": {
        "mime": "video/mp4; codecs=\"avc1.invalid\"",
        "kind": "video",
        "api": "HTMLMediaElement.canPlayType",
        "element": "video",
        "category": "malformed-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-video/mp4; codecs=\"avc1.invalid\"": {
        "mime": "video/mp4; codecs=\"avc1.invalid\"",
        "kind": "video",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "malformed-profile",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-audio/mp4": {
        "mime": "audio/mp4",
        "kind": "audio",
        "api": "HTMLMediaElement.canPlayType",
        "element": "audio",
        "category": "container-only",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-audio/mp4": {
        "mime": "audio/mp4",
        "kind": "audio",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "container-only",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "html-audio/webm; codecs=\"mp4a.40.2\"": {
        "mime": "audio/webm; codecs=\"mp4a.40.2\"",
        "kind": "audio",
        "api": "HTMLMediaElement.canPlayType",
        "element": "audio",
        "category": "container-codec-mismatch",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      },
      "mse-audio/webm; codecs=\"mp4a.40.2\"": {
        "mime": "audio/webm; codecs=\"mp4a.40.2\"",
        "kind": "audio",
        "api": "MediaSource.isTypeSupported",
        "element": null,
        "category": "container-codec-mismatch",
        "executionJoin": null,
        "join": "exact MIME only; queries do not imply successful playback"
      }
    },
    "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.codecs. 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/codecs"

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