Download Lagarith by Ben Greenwood from Codecs and Filters software directory
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Publisher Publisher: Ben Greenwood

Lagarith


Lagarith is a lossless video codec intended for editing and archiving. It offers better compression than codecs like Huffyuv, Alparysoft, and CorePNG. There are a few lossless codecs that can compress better than Lagarith, such as MSU and FFV1; however Lagarith tends to be faster than these codecs. Lagarith is able to operate in several colorspaces - RGB24, RGB32, RGBA, YUY2, and YV12. For DVD video, the compression is typically only 10-30% better than Huffyuv. However, for high static scenes or highly compressible scenes, Lagarith significantly outperforms Huffyuv. A comparison for various types of video can be found here. Lagarith is able to outperform Huffyuv due to the fact that it uses a much better compression method. Pixel values are first predicted using median prediction (the same method used when "Predict Median" is selected in Huffyuv). This results in a much more compressible data stream. In Huffyuv, this byte stream would then be compress using Huffman compression. In Lagarith, the byte stream may be subjected to a modified Run Length Encoding if it will result in better compression. The resulting byte stream from that is then compressed using Arithmetic compression, which, unlike Huffman compression, can use fractional bits per symbol. This allows the compressed size to be very close to the entropy of the data, and is why Lagarith can compress simple frames much better than Huffyuv, and avoid expanding high static video. Additionally, Lagarith has support for null frames; if the previous frame is mathematically identical to the current, the current frame is discarded and the decoder will simply use the previous frame again.
Version Version:1.3.25
Operating System OS Support:Microsoft Windows
Downloads Downloads:1123
Help Tech Help:Software Forum
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Version 1.3.25 Changelog

Fixed some bugs introduced in 1.3.21 that broke backwards compatibility with 1.1.x and below
Codec settings are now stored in the Windows registry rather than in config files, this should reduce issues with settings on Windows Vista and 7
Added lookup tables to eliminate a conditional in the range encoder, speeding up encoding
Replaced a division with an approximate reciprocal multiply and reorganized the run detection code in the range decoder to speed up decoding
Changed the Run Length Encoder to encode with a run trigger of length 3 only, and then encode with a run trigger of 1 only if the result is sufficiently small. This speeds up encoding of typical video
Added MMX version of the Run Length Encoder to speed up encoding on processors that don't have SSE
SSE2 routines originally written for x64 are now included for the x86 build, and are used if they perform faster than the MMX versions on the given processor
Some more tweaks to the SSE2 routines to improve performance
Lagarith Download Statistics (Updated on May 23, 2012):

1123 visitors have downloaded Lagarith 1.3.25 by Ben Greenwood since it was published on Codecs and Filters downloads category on May 31, 2011 and updated to version 1.3.25 on May 31, 2011. 0 visitors wrote their reviews and it's not rated yet.

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