Reuses libheif's own LGPL/MIT-licensed with-alpha-512x512.heic sample under both a .heic and .heif filename, verified to decode correctly via heic-convert (the library the image format work will use). No suitably-licensed HEVC/mif1-branded .heif-distinct sample exists that is compatible with the pinned libheif-js version, and file-type detects both extensions identically regardless of container brand, so the duplicate content is sufficient to exercise the heif source-format code path.
8.1 KiB
8.1 KiB