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73 <h1>Ogg logical and physical bitstream overview</h1>
91 <h2>Logical and physical bitstreams</h2>
94 structured bitstream data called <em>logical bitstreams</em>. A
95 logical bitstream consists of pages, in order, belonging to a single
101 <p>Multiple logical bitstreams can be combined (with restrictions) into a
103 multiple logical bitstreams multiplexed at the page level and may
104 include a 'meta-header' at the beginning of the multiplexed logical
106 order from multiple logical bitstreams and combined into a single
108 logical bitstreams from the physical bitstream by taking the pages in
110 appropriate logical decoding entity. The simplest physical bitstream
111 is a single, unmultiplexed logical bitstream with no meta-header; this
114 <p><a href="framing.html">Ogg Logical Bitstream Framing</a> discusses
116 and logical bitstreams in detail. The remainder of this document
122 <p>Logical bitstreams may not be mapped/multiplexed into physical
140 logical bitstream, the first page of an Ogg bitstream obeys
144 <p>The first page of a logical Ogg bitstream consists of a single,
146 identify the exact CODEC type and media requirements of the logical
159 <p>The simplest form of logical bitstream multiplexing is concatenation
160 (<em>chaining</em>). Complete logical bitstreams are strung
162 page of a given logical bitstream is immediately followed by the
163 initial page of the next. Chaining is the only logical->physical
166 <p>Each chained logical bitstream must have a unique serial number within
171 <p>Logical bitstreams may also be multiplexed 'in parallel'
174 and different logical bitstreams, in the same physical bitstream.
175 Whole pages from multiple logical bitstreams are mixed together.</p>
177 <p>The initial pages of each logical bitstream must appear first; the
181 with the initial page of a logical video bitstream, followed by the
183 for the logical bitstreams need not all occur contiguously (although a
207 <p>In this example, we see pages from five total logical bitstreams
219 logical bitstream follow page <tt>n-1</tt> in the physical bitstream.
221 logical bitstreams. (Tying page appearance to bitrate demands is one
222 logical strategy, ie, the page appears at the chronological point
