(registered 2026-05-11, last updated 2026-05-11)

Media type name: application

Media subtype name: cmcd

Required parameters: N/A

Optional parameters: N/A

Encoding considerations: 8bit

UTF-8 coded strings

Security considerations: The privacy and security concerns are discussed in sec. 7 of the CMCD specification.

Interoperability considerations: The MIME type describes a standardized "snapshot" of media player state and conditions, and is intended to enable interoperable analysis and monitoring solutions for media distribution.

Published specification: This MIME type corresponds to the batch format of the Common Media Client Data specification, CTA-5004.

The second version of this specification contains the batch functionality. The final published version of the spec is available at https://cta-wave.github.io/Resources/common-media-client-data--cta-5004-b.html.

Applications which use this media: Requests with this MIME type are emitted by media players. The receiving service would typically use these for purposes such as, monitoring and fault analysis.

Fragment identifier considerations: N/A

Restrictions on usage: N/A

Additional information:

1. Deprecated alias names for this type: N/A
2. Magic number(s): N/A
3. File extension(s): cmcd
4. Macintosh file type code: N/A
5. Object Identifiers: N/A

Person to contact for further information:

1. Name: Alexandra Blasgen
2. Email: ablasgen&cta.tech

Intended usage: COMMON

Author/Change controller: Consumer Technology Association (CTA)