Issue #2209: HEIF: Invalid input: No 'ftyp' box.
Adding a magic number for HEIC/HEIF, which would allow to discard obvious non-HEIC images even with the wrong extension. Note: it looks like this magic number would also match more generically other ISO base media file format (ISOBMFF) formats, like .mov or .mp4 files. I am enquiring for better magic but for now, this is better than nothing.
Showing with 4 additions and 0 deletions