Video and audio compression are usually handled by different codecs (audiovisual encoders). MP4 files are typically smaller in size than other audio or video file types because MP4 files use a mix of compression technologies. mp4.An MP4, sometimes known as an MPEG4, is a multimedia file that is used to store video or audio data. The only official filename extension for MPEG-4 Part 14 files is. A separate hint track is used to include streaming information in the file. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. 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. 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. Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files. M4R supports auditory masking - essentially discarding data with minimal loss of quality. It is a lossy algorithm much like AAC and MP3. It is part of the MPEG-4 standard and is specified in the ISO/IEC standard 14496-3. M4R is essentially a renamed AAC (M4A) file - it is similar to MP3 but compresses the digital audio files further. An M4R ring tone is automatically transferred to a user's iPhone when the iPhone is synced with the user's computer. In order to create an M4R ring tone from an iTunes song, the song must allow for M4R ringtone creation. Not all iTunes Music Store songs can be used to create M4R ringtones. The M4R is an iPhone ringtone file that is essentially a renamed AAC (m4a) file.
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