[opus] opusenc -- no track number metadata?

[John Buckman]

The docs for opusenc at
https://mf4.xiph.org/jenkins/view/opus/job/opus-tools/ws/man/opusenc.html

don't mention any way to specify the track number metadata.  

Is there an undocumented way to do this, or this feature not available?

Or is the "track number" meant to be a "comment" ?

More people at Magnatune are downloading our opus files, so this came up...

-john

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