v152 · media · eme · covered on mdn
MediaCapabilities.decodingInfo.encryptionScheme
Adds the encryptionScheme attribute to the KeySystemTrackConfiguration dictionary used in navigator.mediaCapabilities.decodingInfo(). This allows web applications to query whether a specific encryption scheme (such as 'cenc' or 'cbcs') is supported. The feature is approved in the W3C Media Capabilities spec and the backend implementation already existed in Chromium — this launch plumbs the encryptionScheme property from the Blink IDL layer to that backend.
this feature is documented on MDN
MDN's method reference documents the encryptionScheme member of the key-system track configuration — its purpose (the encryption scheme associated with the content type, such as cenc, cbcs, cbcs-1-9), its null default (any encryption scheme may be used), and the requirement that the enclosing audio or video configuration must also be set — alongside syntax, examples, specifications, and browser compatibility. gendn doesn't duplicate that here.
Why gendn doesn't duplicate MDN: this site exists for Chrome features that have no MDN reference yet. When MDN covers a feature completely, the honest page is a pointer to the canonical reference plus the shipping metadata MDN doesn't track — duplicated prose would only drift out of sync.
quick reference
| The change | The encryptionScheme member of KeySystemTrackConfiguration (inside MediaCapabilitiesDecodingInfo.keySystemTrackConfiguration.audio/.video) is now wired from Blink's IDL to Chromium's existing backend, so decodingInfo() can answer per-encryption-scheme support queries ('cenc', 'cbcs', 'cbcs-1-9') instead of only scheme-agnostic ones |
|---|---|
| Chrome status | Enabled by default in Chrome 152 (the milestone listing is authoritative, verified 2026-07-28) |
| Spec | Media Capabilities — KeySystemTrackConfiguration.encryptionScheme |
| MDN | MediaCapabilities.decodingInfo() · Media Capabilities API |
| ChromeStatus | 4644898109259776 — MediaCapabilities.decodingInfo.encryptionScheme |