[media-types] [IANA #1443847] text/cmcd registration req uest

Hi Darrel,

They're checking on the change from text to application, but in the meantime, they sent a link to the spec:

https://cta-wave.github.io/Resources/common-media-client-data--cta-5004-a.html

thanks,
Amanda

On Sat Feb 21 20:31:54 2026, [email protected] wrote:
> Why is this a text/* media type?  It sounds a lot like structured
> content rather than text.  I can't tell because the specification
> isn't publicly available, but based on examples in the GitHub repo it
> doesn't look like text for human consumption to me.
> 
> E.g.
> CMCDRequest:bl=21300,dl=18500,mtp=48100,nor="..%2F300kbps%2Ftrack.m4v",nrr="12323-
> 48763",su
> CMCD-Object:br=3200,d=4004,ot=v,tb=6000
> CMCD-Status:bs,rtp=12000
> CMCD-Session:cid="faec5fc2-ac30-11ea-bb37-
> 0242ac130002",pr=1.08,sf=d,sid="6e2fb550-c457-11e9-bb97-
> 0800200c9a66",st=v
> 
> https://github.com/cta-wave/common-media-client-
> data/issues/185#issuecomment-3385947158
> 
> This should just be registered as application/cmcd and the JSON
> variant can be application/cmcd+json.
> 
> Darrel
> 
> ________________________________
> From: Amanda Baber via RT <[email protected]>
> Sent: Wednesday, February 18, 2026 2:43 PM
> Cc: [email protected] <[email protected]>; Darrel Miller
> <[email protected]>
> Subject: [IANA #1443847] text/cmcd registration request
> 
> Hi Darrel,
> 
> Sending a reminder for this request from February 11th.
> 
> thanks,
> Amanda
> 
> On Wed Feb 11 19:11:38 2026, amanda.baber wrote:
> > Hi Darrel,
> >
> > Could you review this registration request for us by February 25th?
> >
> > The CTA has already been approved for standards-tree media type
> > registration.
> >
> > thanks,
> > Amanda
> >
> > =====
> >
> > Name: Alexandra Blasgen
> >
> > Email: [email protected]
> >
> > Media type name: text
> >
> > 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 CMCDv2 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://www.cta.tech/standards/cta-5004.
> >
> > 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
> >
> > Provisional registration? (standards tree only): No
> >
> > 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
> >
> > General Comments:
> >
> > Person to contact for further information:
> >
> > 1. Name: Alexandra Blasgen
> > 2. Email: [email protected]
> >
> > Intended usage: COMMON
> >
> > Author/Change controller: Consumer Technology Association (CTA)

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