MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. The only filename extension for MPEG-4 Part 14 files as defined by the specification is .mp4. MPEG-4 Part 14 (formally ISO/IEC 14496-14:2003) is a standard specified as a part of MPEG-4.
Portable media players are sometimes advertised as \"MP4 players\", although some 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 the more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon the QuickTime File Format which was published in 2001.  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.
The MPEG-4 file format, version 1 was published in 2001 as ISO/IEC 14496-1:2001, which is a revision of the MPEG-4 Part 1: Systems specification published in 1999 (ISO/IEC 14496-1:1999). In 2003, the first version of the MP4 file format was revised and replaced by MPEG-4 Part 14: MP4 file format (ISO/IEC 14496-14:2003), commonly named as MPEG-4 file format version 2. The MP4 file format was generalized into the ISO Base Media File format ISO/IEC 14496-12:2004, which defines a general structure for time-based media files. It in turn is used as the basis for other file formats in the family (for example MP4, 3GP, Motion JPEG 2000).
The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions. Some of these extensions are also used by other formats based on ISO base media file format (e.g. 3GP). A list of all registered extensions for ISO Base Media File Format is published on the official registration authority website. The registration authority for code-points (identifier values) in \"MP4 Family\" files is Apple Inc. and it is named in Annex D (informative) in MPEG-4 Part 12. Codec designers should register the codes they invent, but the registration is not mandatory and some invented and used code-points are not registered. When someone is creating a new specification derived from the ISO Base Media File Format, all the existing specifications should be used both as examples and a source of definitions and technology. If an existing specification already covers how a particular media type is stored in the file format (e.g. MPEG-4 audio or video in MP4), that definition should be used and a new one should not be invented.
Most kinds of data can be embedded in MPEG-4 Part 14 files through private streams. A separate hint track is used to include streaming information in the file. The registered codecs for MPEG-4 Part 12-based files are published on the website of MP4 Registration authority (mp4ra.org), but most of them are not widely supported by MP4 players. The widely supported codecs and additional data streams are:[obsolete source]
The so-called moov atom contains information about video resolution, frame rates, orientation, display characteristics, and more. It might be placed at the beginning or end of the file. In the latter case, the video file is not playable if the file is incomplete (truncated).
However, MP4 is a lossy format. This means that every time you save the same audio or video file as an MP4, you lose a little bit of data, and thus a little bit of quality. If you re-save an MP4 file enough times, eventually, the quality will be unrecognizable. This is a very rare occurrence, but it does happen.
That single-digit difference might give the impression that they are more-or-less the same thing, but nothing could be farther from the truth. They each have distinct uses, histories, and advantages; MP3 and MP4 are not two editions of the same thing.
MP3 is short for MPEG-1 Audio Layer 3. It was one of two formats that were considered for the MPEG audio standard back in the early-1990s. Electronics firm Philips, French research institute CCETT, and Germany's Institute for Broadcast Technology backed the format thanks to its simplicity, lack of errors, and computational efficiency.
MP4 stands for MPEG-4 Part 14. This technology is based on Apple's QuickTime MOV format but adds support for various other MPEG features. The file type was first released in 2001, but it's the 2003 re-release that's now commonly used when you see MP4 files. There have been no further updates to the format since 2003.
MP3 files can only be used for audio, whereas MP4 files can store audio, video, still images, subtitles, and text. In technical terms, MP3 is an \"audio coding\" format while MP4 is a \"digital multimedia container\" format.
Because they are so good at storing audio, MP3 files have become the de facto standard audio format for music software, digital audio players, and music streaming sites. No matter which operating system or device you own, you can be confident MP3s will work right out of the box without a hitch. It's why MP3 players might still be worth buying.
The main reason they're so popular is the way the file type works. MP3s use lossy compression, which vastly reduces the size of an audio file while barely affecting its quality. The process works by stripping out all the data beyond the average person's hearing range, then compressing the rest as efficiently as possible.
MP3s also allows users to balance the trade-off between audio quality and file size. If you're an audiophile, you can opt for larger file sizes with higher bitrates and better audio quality. On the other hand, if you want to squeeze as much music as possible onto your portable device, you can reduce the file size and audio quality accordingly.
Furthermore, MP3s will always be smaller than equivalent MP4 files. So, if your audio player or smartphone is getting full, you should convert any audio saved as MP4 into MP3 format. Note that you may take a hit to audio quality in the process!
There are hundreds of codecs out there today, but not many will work with mainstream MP4 players. In order for a player to be able to read and play an MP4 file, it must have the same codec itself. The most widely-supported codecs are:
These codecs give MP4s a lot more flexibility than MP3. For example, M4A files (which are MP4 files that only contain audio) can handle both Advanced Audio Coding (AAC) and Apple Lossless Audio Coding (ALAC). The choice of quality resides with the user. Either way, the file will appear as an MP4 file, but the data within the file will differ vastly.
Besides audio, MP4 files can also contain video, images, and text. You'll often see various file extensions that give an indication of the type of data within the container. Here are some of the most common:
MP4 files can implement metadata in the same way as MP3s, but they also introduce the Extensible Metadata Platform (XMP). XMP metadata is well-suited for MP4's container format thanks to its compatibility with a vast number of file types, including PDF, JPEG, GIF, PNG, HTML, TIFF, Adobe Illustrator, PSD, WAV, and PostScript.
In summary, if you're saving audio for use on portable players, you should look to MP3. If you want to save video, or you want to stream your content over the internet, you should use MP4. MP4 does work for audio files, but it is not the most optimal solution.
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Both MOV and MP4 format are file containers usually used for saving video files. The MOV format was originally developed by Apple Inc. as a format for its QuickTime movies. MOV displayed advantages in everyday use, for example, providing better video quality, ability to improve sound and image quality, but it suffers hindrance from its proprietary nature as well. The MP4 format which was created based on the MOV file type and their both specifications were essentially identical at first was later developed as the standard format in the multimedia industry.
In this guide, we answer all of your questions about the key differences between an MP4 file and a MOV file. What can these two types of video container files be used for We look at compatibility as well as quality, and the pros and cons when comparing MP4 vs. MOV. The good news is that both of these file formats can hold lots of data and are suitable for professional video projects, but it is important to understand the subtle differences, choose which file to use, and how to convert MOV to MP4 and MP4 to MOV.
MP4 files were created in the early 2000s by the Motion Picture Experts Group (MPEG). This is how they get their name, MPEG-4. This is contained within the MP4 and has become one of the standard ways of compressing videos. An MP4 format file is a container form just like a .mov file format. This file contains not only the video file but also has data encapsulated within. 59ce067264