[opus] Opus for ASR
Timothy B. Terriberry
tterribe at xiph.org
Mon Sep 17 12:41:03 PDT 2012
Young, Milan wrote:
> Is there any precedent for standard flags associated with a codec ( eg bit rate)?
> Any other good reasons for including aspects of encoding in 6716 or pushing through a sibling RFC?
It's too late for 6716 (unless done as an errata), but 6716 doesn't
define an actual file format or mime type. That is currently done in
(http://tools.ietf.org/html/draft-terriberry-oggopus, which will
hopefully be promoted to a WG draft at some point). See Section 8.
That's probably the right place to do something like this.
RFC 6381 defines a "codecs" parameter for mimetypes with a dot-separated
namespace for adding additional codec-specific parameters. I'm not sure
bitrate makes sense as part of a mimetype, but a codecs=opus.asr might
Don't be confused by the "profiles" parameter from RFC 6381, though.
That's meant in the ISO/MPEG sense of something which defines what the
decoder must support to decode a file. What you're interested in is
controlling the encoder (I hope; we'd prefer not to have decoders that
only support a subset of Opus's functionality because it's bad for
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