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macOS build, script subsampling improvements#42

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digitaltvguy wants to merge 8 commits intogfxdisp:mainfrom
digitaltvguy:main
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macOS build, script subsampling improvements#42
digitaltvguy wants to merge 8 commits intogfxdisp:mainfrom
digitaltvguy:main

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@digitaltvguy
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Adds zimg for zscale and other necessary operations

Adds zimg for zscale and other necessary operations
....once homebrew ffmpeg is installed along with symlinks in macOS on METAL (GPU)
Custom script to build per-frame analysis and PQ file handling for side-by-side heatmap/video comparisons
Creates symlinks in macOS homebrew anaconda3 environment for cvcdp ffmpeg to normal /opt/homebrew/bin/ffmpeg path so that more capable ffmpeg can be used.
1. filter=spline36
2. Updated install instructions
3. Moved macOS brew formula into folder
@digitaltvguy digitaltvguy changed the title homebrew formula for more capable ffmpeg macOS build, script subsampling improvements Mar 7, 2026
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added subsampling improvements and merged all macOS specific code to a single directory

It won't accept 4:2:2 subsampled content so more coding is required to normalize images
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