MPEG-4 Part 14 or MP4 (formally ISO/IEC 14496-14:2003) is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.

Some devices advertised as "MP4 Players" are simply MP3 Players that also play AMV video or some other video format, and do not necessarily play the MPEG-4 part 14 format.

MPEG-4 Part 14 is an instance of more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon QuickTime File Format. MPEG-4 Part 14 is essentially identical to the QuickTime file format, but formally specifies support for Initial Object Descriptors (IOD) and other MPEG features. MPEG-4 Part 14 revises and completely replaces Clause 13 of ISO/IEC 14496-1 (MPEG-4 Part 1: Systems), in which the file format for MPEG-4 content was previously specified.

Emily Jordan Osment (born March 10, 1992) is an American actress, singer-songwriter and voice actress born in Los Angeles, California. After working in several television films in her childhood, she gained fame for co-starring as Gerti Giggles in Spy Kids 2: Island of Lost Dreams and Spy Kids 3-D: Game Over. She went on to co-star in the Emmy Award-nominatedDisney Channel sitcom Hannah Montana as Lilly Truscott as well as the series movie, Hannah Montana: The Movie. She also starred as Cassie in R. L. Stine's: The Haunting Hour Volume One: Don't Think About It and the Disney Channel Original Movie, Dadnapped as Melissa Morris. She most recently starred in the ABC Family Original Movie, Cyberbully.

Osment expanded her repertoire into pop music and more recently alternative/indie rock where she has recorded teen pop hits like "I Don't Think About It", "If I Didn't Have You" alongside her Hannah Montana co-star Mitchel Musso, and most recently "Once Upon a Dream".

Osment's debut album, Fight or Flight was released on October 5, 2010 via Wind-up Records, and it features lead single "Let's Be Friends" which was released June 8, 2010. The second single off the album, "Lovesick", was released on October 19, 2010.