wed by the
initial page of the next. Chaining is the only logical->physical
mapping allowed by Ogg Vorbis.</p>

<p>Each chained logical bitstream must have a unique serial number within
the scope of the physical bitstream.</p>

<h3>concurrent multiplexing (grouping)</h3>

<p>Logical bitstreams may also be multiplexed 'in parallel'
(<em>grouped</em>). An example of grouping would be to allow
streaming of separate audio and video streams, using different codecs
and different logical bitstreams, in the same ph