August 2010
Intermediate to advanced
346 pages
8h 36m
English
Content preview from The H.264 Advanced Video Compression Standard, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 9. H.264 performance
Introduction
The driving force behind the widespread adoption of H.264/AVC is its potential for significantly better compression performance than older formats such as MPEG-2 and MPEG-4 Visual. However, getting the best possible performance from an H.264 codec is not a straightforward task. First, despite the fact that H.264/AVC is an industry standard, there is a wide variation between practical implementations of H.264 codecs, with a corresponding variation in coding performance. Second, the large number of coding options supported by H.264 introduces a problematic trade-off between compression and computation. Achieving the best possible compression performance from an H.264 codec can result in a computational cost that is prohibitive for practical applications.
Probably the best way to understand the performance trade-offs and the capabilities of H.264/AVC is to experiment. Fortunately, a number of public-domain implementations are available that make this possible. The Joint Video Team, responsible for developing and maintaining the standard, publish a reference software implementation of H.264/AVC, the Joint Model (JM) codec. The JM is intended to be a complete and accurate implementation of all the features of H.264. It is not suitable for a practical, real-time coding application but is a useful reference tool to test the potential of H.264 and to check inter-operability between codecs and bitstreams. Using the JM and/or other H.264 implementations, ...
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