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This specification defines the stream formats for use with the Encrypted Media Extensions.
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Implementors should be aware that this specification is not stable. Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways. Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the mailing list mentioned below and take part in the discussions.
This document was published by the HTML Working Group as an Editor's Draft. If you wish to make comments regarding this document, please send them to public-html-media@w3.org (subscribe, archives). All comments are welcome.
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This document is governed by the 1 September 2015 W3C Process Document.
This registry is intended to enhance interoperability among implementations and users of encrypted media streams with the Encrypted Media Extensions (EME) specification. In particular, this registry provides the means (1) to identify and avoid collisions among content type strings, and (2) to disclose information about encrypted data formats accepted by EME implementations to promote interoperability.
The registry maintains a mapping between content type strings and encryption format specifications, which describe the structure, semantics, and processing of the formats.
The strings are those used for the media type/subtype pairs in contentType values provided to Encrypted Media Extensions [ENCRYPTED-MEDIA] APIs.
This registry is not intended to include any information on whether a stream format is encumbered by intellectual property claims. Implementors and users are advised to seek appropriate legal counsel in this matter if they intend to implement or use a specific stream format.
Each entry must include a unique Initialization Data Type string.
Each entry must include a link that references a publicly available specification. It is RECOMMENDED that such a specification be made available without cost (other than reasonable shipping and handling if not available by online means).
Candidate entries must be announced on public-html-media@w3.org(subscribe, archives) so they can be discussed and evaluated for compliance before being added to the registry.
Per the Encrypted Media Extensions specification, the media container for a stream format MUST NOT be encrypted.
Per the Encrypted Media Extensions specification, entries MUST be fully specified and support "common encryption" such that the content can decrypted in a fully specified and compatible way when a key or keys are provided.
| MIME type/subtype | Public Specification(s) |
|---|---|
|
audio/mp4
video/mp4 |
ISO Common Encryption ('cenc') Protection Scheme for ISO Base Media File Format Stream Format |
|
audio/webm
video/webm |
WebM Stream Format |