Coverity found use after free bugs in the fxt1_encode code. This report can be found under https://scan.coverity.com/projects/4391 as CID 38222. Richard Goedeken fixed this in the mupen64plus-video-glide64mk2 fork of this code in patch https://github.com/mupen64plus/mupen64plus-video-glide64mk2/commit/438dd4fb69dbe48504bca53d80c284e0f4027c7f
Seems like the code has since then diverged too much to be comparable
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