Convert mxf to nist

What is the difference between .mxf and .nist?

Description: Multimedia format used by digital audio and video programs; contains captured audio and video data as well as metadata that describes the media stored in the file; designed by Society of Motion Picture and Television Engineers (SMPTE) as a standard container for audio and video data; can be converted into other formats, such as .AVI or .MOV.; SPHERE (SPeech HEader Resources) is a file format defined by NIST (National Institute of Standards and Technology) and is used with speech audio. SoX can read these files when they contain μ-law and PCM data. It will ignore any header information that says the data is compressed using shorten compression and will treat the data as either μ-law or PCM. This will allow SoX and the command line shorten program to be run together using pipes to encompasses the data and then pass the result to SoX for processing.