Recently DivX Networks released a new DivX version for Windows based computers. Version 5.1
had a huge increase in encoding speed and besides that it promised significant
improvements in performance and visual quality. Today, thanks to GristyMcFisty for reporting this, we
know that a Mac version of the DivX 5.1 codec has also been released. Here's the
changelog for the Mac version:
 DivX v5.1 for Mac, New:
- Added a new high-quality psychovisual
mode that includes the following features:
- Texture cortex masking and rate
distortion algorithm.
- Hybrid mode (with texture cortex
masking).
- Speed optimization.
- Chroma operation (this option is not
enabled by default for performance reasons; to enable it, create an
empty file on your desktop called "DivxPvShapingChroma.txt" for "fast"
mode and "DivxPvSimpleChroma.txt" for slow mode; testing shows only
1-2% gains in JND tests).
- The decoder has been re-architected
and is now 50 to 100% faster.
- The decoder now supports automatic
post-processing during video playback.
- Added new features to the rate control
modes of the encoder, including:
- A complexity vector log file.
- An API that allows real-time control
of rate control.
- An API that allows forced I-frame
insertion.
- Added a high-quality B-frame mode. The
motion estimation for B-frames is improved, and the quantization
modulation is changed.
Improved:
- Redesigned encoder GUI. The new GUI is
more accessible and simplifies overall usage.
- DivX 3 compatibility. (There were no
problems detected on any of the more than 60 hours of test content.)
- Performance of Nth Pass strategy
planning performance.
- AVI importer's IMA ADPCM parser
modified for more compatibility.
Fixed:
- A bug that caused the quantizer to
overshoot the bitrate following a transition to a complex scene.
- A bug that limited the interframe
change in quantizer to the ideal quantizer or plus or minus 2.
- A bug with the rate control video
buffer verifier (VBV) that would enforce a "3 sec" max bitrate.
- Several bugs that affected Nth Pass
encoding strategy planning.
- A bug that caused motion vector (MV)
reuse to be non-functional.
- A bug that caused problems when MV
reuse and psychovisual mode were used together.
- QuickTime 5 encoding and decoding
support.
- Fixed bug with iMovie when
importing media files with IMA-ADPCM or MP3.
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You
can download DivX v5.1 for the Mac right
here. Please use our
Video
Editing and Authoring Forum to discuss this latest version of the
DivX video codec.
Source: DivX.com
