QTIF

QTIF (QuickTime Image Format) is a now-deprecated container format for still images from a QuickTime video. It consists of a description section and an image data section. The image data may be of various formats, including JPEG. The "native" parts of this format use big-endian byte order, though the image data part may use a different endianness depending on that format's standards.

.qif is the recommended file extension, though .qtif can also be found. The MacOS file type identifier is 'qtif'.

Format description

 * Format description in Apple developer site

Other links

 * Source code for reading QTIF data
 * Apple QuickTime Player QTIF File Remote Code Execution Vulnerability
 * Where did .qtif export go?