[performance] move thumbnail generation to go code where possible (#3183)
* wrap thumbnailing code to handle generation natively where possible * more code comments! * add even more code comments! * add code comments about blurhash generation * maintain image rotation if contained in exif data * move rotation before resizing * ensure pix_fmt actually selected by ffprobe, check for alpha layer with gifs * use linear instead of nearest-neighbour for resizing * work with image "orientation" instead of "rotation". use default 75% quality for both webp and jpeg generation * add header to new file * use thumb extension when getting thumb mime type * update test models and tests with new media processing * add suggested code comments * add note about thumbnail filter count reducing memory usage
kim
GitHub
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