Unable to decode JFXX jpeg

[JimBobSquarePants]

Discussed in #2478

^{Originally posted by hey-red June 20, 2023}
When I try to identify or decode image that contains JFXX marker, I got an exception System.NotSupportedException: 'Unknown App0 Marker - Expected JFIF.'

I think it's an expected behavior, because jpeg decoder works only with JFIF identifier, but if I just change JFXX to JFIF with hex editor, then image can be sucessfully decoded.

I not sure that this is issue, because it's maybe a MJPEG frame(?), but other tools like image editors, viewers and browsers can display that image,

Example image