Media recording

Find it in the repository

Collector source

core/signals/video/recording.ts

Export

measurementModule · Signal object

Field definitions

core/definitions/media/recording.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.recording

Collector

media.recording

API / surface

core/signals/video/recording.ts

Timeout

3750 ms

Companion signals

None

Fixture inputs

Inline owned corpora (listed below)

• core/fixtures/media/encoding.ts · sha256:704346a3fe365612612d95342836c36a2692a9cf048db14078445cafeee77dbd

[
  {
    "key": "media.recording.responses",
    "inputs": {
      "query-0": {
        "mimeType": ""
      },
      "query-1": {
        "mimeType": "video/webm"
      },
      "query-2": {
        "mimeType": "video/webm; codecs=\"vp8\""
      },
      "query-3": {
        "mimeType": "video/webm; codecs=\"vp9\""
      },
      "query-4": {
        "mimeType": "video/mp4"
      },
      "query-5": {
        "mimeType": "video/mp4; codecs=\"avc1.42E01E\""
      },
      "query-6": {
        "mimeType": "video/mp4; codecs=\"av01.0.04M.08\""
      },
      "query-7": {
        "mimeType": "video/webm; codecs=\"introspection-invalid\""
      },
      "record-default": {
        "selection": "default",
        "width": 64,
        "height": 64,
        "frames": 3,
        "frameSpacingMs": 100,
        "bitrate": "omitted"
      },
      "record-webm": {
        "selection": "webm",
        "width": 64,
        "height": 64,
        "frames": 3,
        "frameSpacingMs": 100,
        "bitrate": "omitted"
      },
      "record-mp4": {
        "selection": "mp4",
        "width": 64,
        "height": 64,
        "frames": 3,
        "frameSpacingMs": 100,
        "bitrate": "omitted"
      }
    },
    "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.recording. 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/recording"

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