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Version 5. Changed: Psychovisual modeling disabled by default. Cosmetic GUI changes have been made to avoid confusion when using MV reuse and specific performance modes. Deinterlacing is back in the Standard codec. Added bottom field first encoding. Smoother DivX logo fade. Fixed: Encoder fixes: DivX 5. The Quality produced by "Fastest" has been significantly improved.

Blinking bottom line in "fastest" mode fixed. Fixed issues with capture applications. Various Cosmetic CLI fixes. New CLI option "-tff" for "top field first". Decoder fixes: Resolved a severe performance hit when using the Deringing mode in Postprocessing. DirectShow filter property page had a cosmetic issue caused by using large fonts dpi. Avoids buffer overruns with extremely small picture sizes less than 80x Issue with n B frames and Deblocking fixed.

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 in C: called "DivxPvShapingChroma. 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. 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. 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 minor bug that affected multiple CPU configuration. 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 a different number of frames to be reported between different passes in VirtualDub.

A bug that caused motion vector MV reuse to be non-functional.

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A bug that caused problems when MV reuse and psychovisual mode were used together. Several bugs with the installer. No stuffing used, bitrate can be too low in some extreme cases. Strategy planning for rate control is much faster now. Better tracking of the planned RC strategy creating more consistent quality. Fixed: K CPU related crash resolved. During 1 pass quality-based, Quantizer can now be set to 1 with CLI.

Multiple error windows no longer open upon entering wrong bitrate modulation option. Multiple error windows no longer open upon entering wrong CLI option. Fixed CLI inconsistencies when "Restore codec's default" is pressed. Max bitrate and encoding bit rate average was displayed same.

Certain dark sequences would produce a long period of frames using a Quantizer of Psychovisual Enhancement field sometimes displayed "Custom" instead of Light when unselected. When "-d 3" option was entered in the CLI field, "Source interlace" became blank. Max bitrate would not update at times. DirectShow decoder would "fast forward" when seeking backwards. Light Psychovisual enabled itself automatically when exiting the CLI field.

Max bitrate reset itself to x10 the average when going in the "profile" tab. MPEG-4 "type Indicator" correctly set according to selected encoding parameters. No more green first frame at very high bitrates.

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Decoder updates the display to the appropriate frame when seeking. Decoder remembers the postprocessing settings. Fixed some memory leaks related to Psychovisual and Nth Pass?

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Nth Pass? RC is tweaked to minimize the usage of high quantizer. Preserving the interlaced fields of interlaced video may sometimes result in better video quality during playback. New de-ringing post-processing algorithm. The new algorithm improves the perceived video quality during playback. It is activated when the post-processing level is set to Level 6. In order for DivX video to be successfully delivered over a restricted channel in real time to a decoder, the encoder's rate control must ensure that the decoder's buffer is not violated.

When this is done properly, then overflow and underflow will never occur and the encoder is said to be "VBV compliant.

It is the encoder's rate control that must ensure compliance. When VBV parameters are specified size, initial occupancy, channel characteristics the rate control should avoid producing video that is in danger of violating the decoder's buffer.

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Bitstream stuffing may be used in extreme cases to prevent overflow in true CBR systems. Underflow must be prevented by increasing frame quantiser or by dropping frames. Target bitrate. We aim to meet the user's requirements as accurately as possible here. This is directly related to filesize. Good-looking video.

DivX Version History - VideoHelp

Rate control should aim to produce the subjectively best quality video given other constraints. Consistency is important here as changes in quality are very noticeable and video is often judged by the worse quality segment in the whole sequence. Another new addition to the rate control arsenal, Nth Pass? Nth Pass encoding uses information garnered from previous passes through the video sequence, which can improve quality with each pass.

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There are four main steps to Nth Pass encoding: Analysis the first pass. Map generation where the results of analyses are processed. Strategy generation strategist examines map of the video sequence and creates a strategy that will best achieve the three VBV RC requirements. In-loop nth pass rate control uses information from the map and strategy to effect rate control that best fulfills the three requirements.