unsupported heif files with "heix" majorBrand

[Thorsten42]

Hi,

I am using imaginary in combination with nextcloud to create preview images. I noticed that *.heif files created using my sony camera (a6700) are unsupported by imaginary, and I get the error message: Unsupported media type.

Since heic files are generally supported, I looked into the code and noticed that the error is raised in line 104 in controllers.go because the mime type detected by http.DetectContentType is "application/octet-stream", and the filetype.Get method cannot detect the type via magic numbers.

Looking further into the filetype function and why the file is not detected as a heic file, I found that the majorBrand is "heix" with the compatibleBrands: [mif1 heix miaf MiHA jpeg SHIF].

Adjusting the heif function in the filetype module to recognize these files as "image/heif" unfortunately caused another issue:
Error while processing the image: Unsupported image format, which seems to originate from the bimg.Size(buf) function at line 123 in controllers.go. Unfortunately, I am currently stuck because I cannot build bimg locally to investigate further.

Do you think this is just an issue of a wrongly detected image type, or are heif/heix images generally unsupported? I’ve added an example image (compressed as a zip file, as github does not allow direct uploads of heif files).

Thanks

DSC00070.zip