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Chip: 2001 Haziran
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Indeo
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Indeo_release_notes
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Indeo4.txt
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Indeo® Video 4 Release Notes, June 28, 1996
Introduction
This version of the codec introduces a number
of benefits including performance improvements, quality enhancements,
and interactive features. The latest version of the Indeo
video 4 codec, along with documentation, sample source
code, the latest technical information updates, and access to
technical support are available on the Indeo software website at http://developer.intel.com/ial/indeo/
Performance Improvements
The performance of this codec has been enhanced
in several ways:
-The codec has been optimized for MMX technology.
MMX technology is a major enhancement to the Intel Architecture
that will make mainstream PCs richer multimedia and communications
platforms. This enhancement includes 57 new instructions that
will allow Intel processors to deliver better performance for
multimedia and communications computation.
-The codec uses less memory. The actual amount
of memory used by the codec when playing a given file will vary
depending on how that file was compressed, but the new codec will
use anywhere from 25% to 40% less memory to open and play a file
than the previous version.
-Files load and start playing faster. The actual
time it takes to open and begin playing a file on a given PC will
vary based on system performance features such as CPU speed, RAM,
L2 cache, etc., but on average the new codec will open and start
playing files 20% to 40% faster than the previous version.
-Playback performance has improved. A number
of optimizations have been made to speed up playback of video
files, especially in 16-bit (65,000-color) display mode.
Compression Enhancements
Enhancements have been made to the offline encoder,
and a new compression mode called the Quick Compressor has been
added to make compressing video files much faster and easier.
Online Help
An online help menu is now available in the encoder's
Configure dialog. This will help guide the user through the various
options available for encoding video clips.
Offline Encoder Improvements
Improvements have been made to the offline encoder
that will allow compressed video clips to display better quality
at lower data rates. This will be especially noticeable in clips
compressed at single-speed CD-ROM data rates (~ 100-135 Kbytes/second)
and lower, and in clips compressed at 30 frames/second at double-speed
CD-ROM data rates (~ 200-250 Kbytes/second) and below. You must
compress clips with the new version of the codec to see these
improvements.
The Quick Compressor
Normal offline encoding can be time-consuming. The
new Quick Compress option allows Indeo video interactive to encode
video many times faster than it otherwise would. Exactly how
much faster depends on the specific content of the source video
and the other encoder options you've selected. The compression
speed improvement, however, is significant: compression jobs
that once took hours may now compress in just minutes.
One reason the Quick Compressor is so much faster
than the offline compressor is that it uses a subset of the offline
encoder's compression techniques. This speeds compression but
slightly reduces overall visual quality. The Quick Compressor
is also slightly less accurate at maintaining the requested target
data rate than the offline encoder.
If you choose Quick Compress several other options
are automatically disabled: bidirectional prediction, transparency,
quality, and minimum viewport size (local decode). Also, the
Quick Compressor can encode video at resolutions up to 640 x 480,
whereas the offline encoder supports resolutions up to 8192 x
8192.
The Quick Compressor is extremely useful for tasks
such as previewing edits and special effects, and for prototyping
multimedia applications. It can also save time when creating
video for hard disk applications, where data rate control is less
critical. However, after you've previewed the video and made
any required adjustments, it's best to use the off-line encoder
to compress the video for your final product. For the best quality
at lower data rates, or to achieve a steady data rate without
spikes, do not use the Quick Compressor.
The Indeo video 4 codec can play back any
video clip compressed with the Quick Compressor.
To enable quick compression, check the Quick Compress
box in the Encoder Controls area of the encoder's Configure dialog
box.
Playback Enhancements
The new version of Indeo video 4 offers
enhanced playback quality, and new features designed to enhance
the interactivity and video quality of Indeo video in multimedia
applications.
Playback Quality Improvements
Changes have been made to the decoder which will
improve the playback quality of both new and existing video clips:
-A problem which was causing a pinkish color
shift in both 16-bit (65,000-color) and 24-bit (16.7-million color)
display modes has been eliminated.
-Zoom-by-two quality has been improved in 16-bit
(65,000-color) display mode. A problem which was causing an excessive
dither pattern has been eliminated.
Alternate Line Zoom-by-two
Indeo video 4 supports alternate line zoom-by-two,
a feature that doubles the video window size by horizontal pixel
doubling and then drawing a row of black pixels in between each
row of image data. This can help reduce some of the "jaggies"
caused by vertical pixel doubling.
Programming Interface Enhancements
A number of enhancements have been made to the ICM
programming interface. These changes will give developers creating
multimedia playback applications improved control over the codec's
interactive features, especially transparency and playback scalability.
Custom Palettes and Dither Patterns
A number of enhancements have been added to the codec
to support the use of custom colors and dither patterns when playing
video back in 8-bit (256-color) mode. Tools, documentation, and
sample code supporting these new enhancements will be available
shortly on the Indeo video home page.
Installation Notes
The current version of the setup program installs
only the 32-bit version of the Indeo video 4 codec,
on Microsoft* Windows* 95 and Windows NT* machines.