erial number</h4>
 
<p>Ogg allows for separate logical bitstreams to be mixed at page
granularity in a physical bitstream. The most common case would be
sequential arrangement, but it is possible to interleave pages for
two separate bitstreams to be decoded concurrently. The serial
number is the means by which pages physical pages are associated with
a particular logical stream. Each logical stream must have a unique
serial number within a physical stream:</p>

<pre><tt>
 byte value

 14  0xXX LSB
 15  0xXX