Convert sfd to g4

What is the difference between .sfd and .g4?

Description: The SFD file format (Sofdec Dreamcast Movie) is a proprietary video file format developed by CRI Middleware specifically for use on the Sega Dreamcast gaming console. This format was used to encode and store video data for playback within Dreamcast games, allowing developers to include high-quality pre-rendered video sequences and cutscenes. The SFD format is optimized for the Dreamcast's hardware capabilities, ensuring smooth playback and efficient storage use on the console's limited media capacity.; Group 4 (G4) used for black and white lossless compression to maintain high-quality images, commonly used in TIFF format compression by fax machines. A picture is seen as black dots and lines on a blank page; the fewer the dots and lines are, the lesser the file size.