What is MPEG-4 video?
MPEG-4 is one of the most recent video/audio compression strategy institutionalized by MPEG group, structured uncommonly for low-bandwidth (under 1.5MBit/sec bitrate) video/audio encoding purposes. MPEG-4 is intended to convey DVD-quality video (MPEG-2) at lower data rates and littler file sizes.
It ought to be noticed that not at all like MPEG-1 and MPEG-2, the MPEG-4’s ancestors, MPEG-4 itself isn’t only one brought together encoding component, yet rather a group name for a few flavors of video and audio encoding strategies that share certain equivalent qualities. These “flavors” are regularly alluded either as “profiles” or “layers” in MPEG-4 compression conspire and each new profile ought to be in reverse agreeable to the more established, “lower” variants of MPEG-4 as far as playback ability.
Most likely the best-known MPEG-4 video encoders are called DivX and XviD, which both are these days completely standard-consistent MPEG-4 encoders. The most widely recognized MPEG-4 profiles that both XviD and DivX use broadly are classified “straightforward profile” and “propelled basic profile”.
Next to those two institutionalized video encoding profiles, the MPEG-4 group has institutionalized a few different profiles. The most critical ones are H263+ (which is utilized broadly in mobile phones, named as 3GP) and H.264 (regularly likewise called as AVC or all the more in fact known as MPEG-4 Part 10).
Since MPEG-4 is a container organize, MPEG-4 files may contain any number of audio, video, and even caption streams, making it difficult to determine the sort of streams in a MPEG-4 file based on its filename extension alone.
The official filename extension for MPEG-4 Part 14 files is .mp4, along these lines the container organize is regularly alluded to just as MP4. Anyway different file extensions are likewise usually used to indicate the substance inside the MP4 container: MPEG-4 files with audio and video generally utilize the standard .mp4 extension.
Audio-just MPEG-4 files generally have a .m4a extension. This is particularly valid for non-secured content. MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as sold through the iTunes Store utilize the .m4p extension.
Audio book and web recording files, which additionally contain metadata including section markers, pictures, and hyperlinks, can utilize the extension .m4a, however more generally utilize the .m4b extension. A .m4a audio file can’t “bookmark” (recall the last listening spot), though .m4b extension files can.
Mobile phones utilize 3GP, a streamlined variant of MPEG-4 Part 12 (a.k.a MPEG-4/JPEG2000 ISO Base Media file design), with the .3gp and .3g2 extensions. These files likewise store non-MPEG-4 data (H.263, AMR, TX3G).
The normal however non-standard utilization of the extensions .m4a and .m4v is because of the prominence of Apple’s iPod, iPhone, and iTunes Store, and Microsoft’s Xbox 360 and Zune. Without mods, Nintendo’s DSi and Sony’s PSP can likewise play M4A.
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