[vorbis] ogginfo speed

[Segher Boessenkool]

> ogginfo decodes the whole file to test stream integrity.

It doesn't decode it.

It reads all of the stream to check for stream integrity, to calculate
length and average bitrate, and to detect chained streams.

> Any objections to a quick add of a -s/--short info mode as a flag so
> it scans headers only? (probably what mp3stat essentially does)

Yes, I object.  All the info you want is available already from other
tools (i.e., vorbiscomment and file).

See also PR #150.

<p>Segher

<p>--- >8 ----
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