[FFmpeg-trac] #11563(undetermined:new): Implement better jpeg compression now that patents on those two algorithms expired

FFmpeg trac at avcodec.org
Wed Apr 30 00:44:50 EEST 2025


#11563: Implement better jpeg compression now that patents on those two algorithms
expired
-------------------------------------+-------------------------------------
             Reporter:  Balling      |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  mjpeg        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: bigger bug is here "Image specific quantization
 tables" which can source code that should compile just fine,
 https://pages.cs.wisc.edu/~ratnakar/rdopt.html and
 there is even a better algorithm that doubles average size savings: Joint
 Optimization of Run-Length Coding, Huffman Coding, and Quantization Table
 With Complete Baseline JPEG Decoder Compatibility.

 Unfortunately, it is patent encumbered probably until 2024 (2025 now,
 btw): https://www.google.com/patents/US7570827

 There are also images comparison
 https://cloud.githubusercontent.com/assets/72159/8814942/99255002-300a-
 11e5-8fcd-4f810b0aa78b.jpg

 vs

 https://cloud.githubusercontent.com/assets/72159/8814943/992ee824-300a-
 11e5-99fe-0f56e3229c84.jpg
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11563>
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