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doc/oggstream.html
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@ -105,7 +105,7 @@ li {
<h1>Ogg bitstream overview</h1>
This document serves as starting point for understanding the design
<p>This document serves as starting point for understanding the design
and implementation of the Ogg container format. If you're new to Ogg
or merely want a high-level technical overview, start reading here.
Other documents linked from the <a href="index.html">index page</a>
@ -136,7 +136,8 @@ the Ogg container itself. Metadata is thus compartmentalized and
layered rather than part of a monolithic design, an especially good
idea as no two groups seem able to agree on what a complete or
complete-enough metadata set should be. In this way, the container and
container implementation are isolated from unnecessary design flux.
container implementation are isolated from unnecessary metadata design
flux.
<h3>Streaming</h3>
@ -296,21 +297,21 @@ buffer-ahead hinting.
in an attempt to make the mux and codec layer implementations 'fully
separable'. Things like specific timebase, keyframing strategy, frame
duration, etc, do not appear in the Ogg container. The mux layer is,
instead, expected to query a codec through a standardized interface,
instead, expected to query a codec through a centralized interface,
left to the implementation, for this data when it is needed.
<p>Though modern design wisdom usually prefers to predict all possible
needs of current and future codecs then embed these dependencies and
the required metadata into the container itself, this strategy
increases container specification complexity, fragility, and rigidity.
The mux and codec implementations become more independent, but the
specifications become less independent. A codec can't do what a
container hasn't already provided for. New codecs are harder to
support, and you can do fewer useful things with the ones you've
The mux and codec code becomes more independent, but the
specifications become logically less independent. A codec can't do
what a container hasn't already provided for. Novel codecs are harder
to support, and you can do fewer useful things with the ones you've
already got (eg, try to make a good splitter without using any codecs.
You're stuck splitting at keyframes only, or building yet another new
mechanism into the container layer to mark what frames to skip
displaying).
Such a splitter is limited to splitting at keyframes only, or building
yet another new mechanism into the container layer to mark what frames
to skip displaying).
<p>Ogg's design goes the opposite direction, where the specification
is to be as simple, easy to understand, and 'proofed' against novel
@ -326,8 +327,8 @@ declaring the structure and interrelations between multiple media
types in a muxed stream. That is, the Ogg container itself does not
specify data like 'which steam is the subtitle stream?' or 'which
video stream is the primary angle?'. This metadata still exists, but
is stored in the Ogg container rather than being built into the Ogg
container. Xiph specifies the 'Skeleton' metadata format for Ogg
is stored by the Ogg container rather than being built into the Ogg
container itself. Xiph specifies the 'Skeleton' metadata format for Ogg
streams, but this decoupling of container and stream structure
metadata means it is possible to use Ogg with any metadata
specification without altering the container itself, or without stream
@ -357,13 +358,12 @@ position.
<h3>Packets, pages, and bitstreams</h3>
<p>Ogg codecs use <em>packets</em>. Packets are octet payloads of
raw, compressed data, containing the data needed for a single
<p>Ogg codecs place raw compressed data into <em>packets</em>.
Packets are octet payloads containing the data needed for a single
decompressed unit, eg, one video frame. Packets have no maximum size
and may be zero length. They do not have any high-level structure or
boundary information; strung together, the unframed packets form a
<em>logical bitstream</em> of apparently random bytes with no internal
landmarks.
and may be zero length. They do not generally have any framing
information; strung together, the unframed packets form a <em>logical
bitstream</em> of codec data with no internal landmarks.
<div class="caption">
<img src="packets.png">
@ -382,11 +382,11 @@ landmarks.
<p>Logical bitstream packets are grouped and framed into Ogg pages
along with a unique stream <em>serial number</em> to produce a
<em>physical bitstream</em>. An <em>elementary stream</em> is a
physical bitstream containing only the pages framing a single logical
bitstream. Each page is a self contained entity, although a packet may
be split and encoded across one or more pages. The page decode
mechanism is designed to recognize, verify and handle single pages at
a time from the overall bitstream.
physical bitstream containing only a single logical bitstream. Each
page is a self contained entity, although a packet may be split and
encoded across one or more pages. The page decode mechanism is
designed to recognize, verify and handle single pages at a time from
the overall bitstream.
<div class="caption">
<img src="pages.png">

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