April 2005
Intermediate to advanced
800 pages
20h 52m
English
Content preview from A Practical Guide to Video and Audio CompressionBecome 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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33
Temporal Preprocessing
33.1 Introduction
Temporal preprocessing is an important part of the preparation for compressing your video. Getting this wrong will significantly compromise your compression ratios and waste bit rate by preserving unwanted artifacts in the video in order to describe the content you do want to deliver.
The main area we are concerned with here is removing interlacing effects when converting the images to a progressively scanned format. This operation will also remove any redundant frames that contain duplicated fields. This is also good for compression purposes. We can eliminate the pulldown that is introduced when playing 24-fps movie film on a 60-Hz TV service such as that used in the United States. However, in territories ...
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