Hello @Unbeknownst
Did you try heif-convert
on the terminal? It can convert it into jpg, png, and y4m. Should be available when libheif
is installed.
Btw…
Heif/heic has more than one picture inside? So it is similar to a gif? Anyway… it is a picture compressed with the video compression h.265. So no doubt there can be more than one picture.