Re: [Cellar] Conversation about a NON-IANA request in Matroska

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 19 August 2021 20:01 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: "Murray S. Kucherawy" <superuser@gmail.com>
cc: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, Codec Encoding for LossLess Archiving and Realtime transmission <cellar@ietf.org>, Francesca Palombini <francesca.palombini@ericsson.com>
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Date: Thu, 19 Aug 2021 16:01:14 -0400
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Subject: Re: [Cellar] Conversation about a NON-IANA request in Matroska
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Murray S. Kucherawy <superuser@gmail.com> wrote:
    >> Implementations MUST accept both in perpetuity.  (that's easy to
    >> implement, and it's an archive format, so disk files and resource
    >> forks...)
    >>
    >> Until 2025, implementations SHOULD use video/x-matroska when creating
    >> files.  After 2025, implementations SHOULD use video/matroska when
    >> creating files.
    >>
    >> (or another year sufficiently far in the future)
    >>

    > If you're going to register "x-dash" on the basis of indeterminate
    > inertia, I would argue the "dash" one isn't worth registering.

okay.

    > I would encourage something like:

    > - register "dash", indicating it is the current and the only officially
    > supported one

    > - register "x-dash", indicating that it's officially
    > deprecated and new implementations MUST NOT generate it

    > - indicate that
    > for supporting legacy implementations, all implementations SHOULD
    > accept both

    > At some point in the future if/when you are convinced nothing generates
    > "x-dash" anymore, you could do an update that turns "x-dash" into an
    > error.

That's why I suggested a transition date, so that this process could be
essentially automatic.  Readers would have some time to catch up.

If readers will never catch up, then I agree, just go with "x-dash", although
it sets a weird precedent to me.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide