Browse Definitions :
File Extension

M4P File Format

MPEG-4 Video File

M4A file format icon

M4P is a file extension for a protected audio file encoded with advanced audio codec (AAC), which is a lossy compression generally intended as the successor to MP3, which had not been originally designed for audio only but was Layer III in an MPEG 1 or 2 video files.

M4P stands for MPEG 4 Protected (audio). The M4P file extension is seen in an Apple iTunes purchased song which uses Apples “Fairplay” DRM (digital rights management). Unprotected AAC  files have an M4A extension.

Both M4P and M4A file extensions are used for audio-only files. Audio-only MPEG 4 container files usually have an M4A file extension.

AAC or M4P file quality is better and file sizes smaller compared to MP3 files. M4A files sound better than MP3 files when encoded at the same bit rate due to some of the enhancements made to the format such as:

  • Compression based on perception -- if it is not within human perception, that sound data may be lost without notable effect to quality.
  • Smaller sample block size of 120 or 128 samples rather than 192 for changing (or transient) signals, allowing for more precise details where they are needed.
  • Larger block sizes in stationary signals, 1024 or 960 vs MP3's 576 sample blocks, allowing for less data to represent a portion of the music that does not have the same complexity.

M4P files can usually only be opened with iTunes and the computer must be authorized prior to playing transferring from an iPod or burning the file. An iTunes account can be authorized on five computers and an iPod may contain the content from a maximum of five accounts.

 

Learn more about M4P-related files:

Andoni Oconchubhair defines MPEG standards at Search SOA

Look for answers to M4P-related questions on IT Knowledge Exchange.

See the iTunes webpage.

Visit the MPEG webpage.

This was last updated in August 2010
Browse File Extensions Alphabetically:

Ask a Question. Find an Answer.

Ask your peers a question about this file extension.

Ask a Question

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

SearchCompliance

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

SearchSecurity

  • Payload (computing)

    The term payload, when used in the context of networking or telecommunications, is the data carried inside of a packet (or other ...

  • access control

    Access control is a security technique that regulates who or what can view or use resources in a computing environment.

  • ethical hacker

    An ethical hacker, also referred to as a white hat hacker, is an information security expert who systematically attempts to ...

SearchHealthIT

SearchDisasterRecovery

  • virtual disaster recovery

    Virtual disaster recovery is a type of DR that typically involves replication and allows a user to fail over to virtualized ...

  • tabletop exercise (TTX)

    A tabletop exercise (TTX) is a disaster preparedness activity that takes participants through the process of dealing with a ...

  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a data center.

SearchStorage

  • storage at the edge

    Storage at the edge is the collective methods and technologies that capture and retain digital information at the periphery of ...

  • Flash Storage

    Flash storage is any type of drive, repository or system that uses flash memory to keep data for an extended period of time.

  • optical disc

    An optical disc is an electronic data storage medium that can be written to and read from using a low-powered laser beam.

Close