Project head: Dr. Dmitriy Vatolin
Testing, charts, analysis: Sergey Grishin
Translating: Daria Kalinkina
Verification: Stas Soldatov
See also:
About the comparison of lossless codecsThe name of this video codec category declares full quality losses absence - the decompressed video stream should be completely identical to original. Output quality is same for all codecs. Absolute absence of losses is a very strong requirement, therefore it is often hard to achieve compression ratios above 3:1. Some of the tested codecs have an opportunity of work in "lossy" mode; it allows to reach considerably higher compression degree with rather small losses of quality. However, only "fully lossless" mode is considered in the current comparison. The only parameter of comparison is the compression level.
Many codecs give an opportunity to adjust the parameter speed/compression ratio; it allows to tune the codec for the specific task (real-time capture or the rendering requiring loss minimization). Only maximum compression ratio result is considered in current work.
Some codecs are capable to accept input data in several color spaces (RGB, YUY2, YV12, etc.), however, compression is not always "lossless". Some codecs "silently" perform the conversion of color spaces, thus, raising a degree of compression. Quality losses coming out of such conversions are not visible, but surely exist. In the given testing work codecs is compared separately for various color spaces, thus in each color space full absence of losses is guaranteed!
Main parts of the comparison:
MSU video codecs comparisons resources:
Project updated by
Server Team and MSU Video Group
Project sponsored by YUVsoft Corp.
Project supported by MSU Graphics & Media Lab
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