- https://en.wikipedia.org/wiki/Hqx
- https://code.google.com/archive/p/hqx/
- http://www.grassvalley.com/docs/WhitePapers/professional/GV-4097M_HQX_Whitepaper.pdf
- Is HQX more efficient than HQ? (e.g. smaller file sizes)
-- https://forum.grassvalley.com/forum/archive/index.php/t-24392.html
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