Re: [codec] Fwd: New Version Notification for draft-terriberry-oggopus-00.txt
Ralph Giles <giles@thaumas.net> Wed, 11 July 2012 17:29 UTC
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Date: Wed, 11 Jul 2012 10:30:21 -0700
From: Ralph Giles <giles@thaumas.net>
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To: Gregory Maxwell <gmaxwell@juniper.net>
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Subject: Re: [codec] Fwd: New Version Notification for draft-terriberry-oggopus-00.txt
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On 12-07-11 9:45 AM, Gregory Maxwell wrote: > But, Opus is new and hits some new applications and it > would seem to be foolish to leave no graceful way out > in the case of currently unanticipated needs. Another versioning example, although it doesn't address the length issue: The draft defines three channel mapping familes which give semantic meaning to the various output channels, and specifies that any unrecognized channel mapping should be treated like mapping 255, which is discrete multichannel with no specific channel meanings. If an a new surround audio encoding became popular, like an ambisonic expansion or a 24 speaker configuration for immersive environments, a revision of this specification could define a new channel mapping family for that encoding. But, and this is something I think the draft could describe more clearly, encoders producing files with that family number could reasonably increment the minor version nibble to indicate a compatible change. This would signal to updated decoders how to interpret the new channel mapping family value, while older decoders would produce discrete output without confusion. > No one who's contributed to the draft so far is new at this, > and, apparently, based on the collective experience with > vorbis, speex, flac, theora, (and the many non Ogg formats > we've all worked with), it doesn't appear that there will > ever need to be anything added to the header. This is my expectation as well. I think it's still valuable to specify decoders MUST ignore extra data at the end of the header packets so later drafts can take advange of the extension flag if it is needed. -r
- [codec] Fwd: New Version Notification for draft-t… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Kevin P. Fleming
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Ralph Giles
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Jean-Marc Valin
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Jean-Marc Valin
- Re: [codec] Fwd: New Version Notification for dra… Ron
- Re: [codec] Fwd: New Version Notification for dra… Ron
- Re: [codec] Fwd: New Version Notification for dra… Gregory Maxwell
- Re: [codec] Fwd: New Version Notification for dra… Ralph Giles
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Ron
- Re: [codec] Fwd: New Version Notification for dra… Timothy B. Terriberry
- Re: [codec] Fwd: New Version Notification for dra… Gregory Maxwell
- Re: [codec] Fwd: New Version Notification for dra… Ron
- Re: [codec] Fwd: New Version Notification for dra… Ron
- Re: [codec] Fwd: New Version Notification for dra… Ralph Giles