Convert xvid to pgm

What is the difference between .xvid and .pgm?

Description: Xvid-encoded video files are digital video files that have been compressed and encoded using the Xvid codec, an open-source video codec designed for compressing video data in order to facilitate faster transmission over computer networks or for more efficient storage on computer disks. Xvid, which is a reverse spelling of "DivX," emerged as a popular format due to its ability to compress video files without significant loss of quality.; A PGM file is a grayscale image file saved in the portable gray map (PGM) format and encoded with one or two bytes (8 or 16 bits) per pixel. It contains header information and a grid of numbers that represent different shades of gray from black (0) to white (up to 65,536). PGM files are typically stored in ASCII text format, but also have a binary representation.