ms</em>. A
logical bitstream consists of pages, in order, belonging to a single
codec instance. Each page is a self contained entity (although it is
possible that a packet may be split and encoded across one or more
pages); that is, the page decode mechanism is designed to recognize,
verify and handle single pages at a time from the overall bitstream.</p>

<p>Multiple logical bitstreams can be combined (with restrictions) into a
single <em>physical bitstream</em>. A physical bitstream consists of
multiple l