Convert MPA to MP4

MP4 MP3 Converter converts MPA files to MP4 format. The software is an all in one audio converter that supports more than 100 audio and video files.

MP4 MP3 Converter also supports batch conversion, and is full compatible with Vista and Windows 7.

1. Free Download MP4 MP3 Converter
2. Install the software by instructions
3. Launch MP4 MP3 Converter
4. Choose MPA Files


Click "Add Files" button to choose MPA files and add them to conversion list.


Choose one or more MPA files you want to convert and then click "Open".


5. Choose "to MP4"
   
   
   
6. Convert MPA to MP4
   
   Click "Convert" to convert MPA files to MP4 format.
   
   
   The software is converting MPA files to MP4 format.
   
   
7. Play and Browse MP4 File


Right-click converted item and choose "Play Destination" to play the destination file, choose "Browse Destination Folder" to open Windows Explorer to browse the destination file.


8. Done

Free Download MP4 MP3 Converter

What is MPA?
MPA is compressed audio file using MPEG Layer I, II or III compression. There are three "layers" in the MPEG-1 Audio specification. In MPEG Audio Layer-1, a simple 32-subband audio compressor using a floating point representation for subband samples. Resolution and scale factor are stored for groups of 12 subsamples. MP1 is only used for Philips DCC Digital Compact cassette with data rates of 384 kbps. Both MPEG-1 and MPEG-2 files use MPEG-1 Audio Layer-2. MPEG-1 Audio Layer-3 becomes the widely popular MP3.

What is MP4?
MPEG-4 Part 14, 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 audio and digital video 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. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4.

MPEG-4 is a patented collection of methods defining compression of audio and visual (AV) digital data. It was introduced in late 1998 and designated a standard for a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) (ISO/IEC JTC1/SC29/WG11) under the formal standard ISO/IEC 14496 - Coding of audio-visual objects. Uses of MPEG-4 include compression of AV data for web (streaming media) and CD distribution, voice (telephone, videophone) and broadcast television applications.

MPEG-4 absorbs many of the features of MPEG-1 and MPEG-2 and other related standards, adding new features such as (extended) VRML support for 3D rendering, object-oriented composite files (including audio, video and VRML objects), support for externally-specified Digital Rights Management and various types of interactivity. AAC (Advanced Audio Coding) was standardized as an adjunct to MPEG-2 (as Part 7) before MPEG-4 was issued.

MPEG-4 is still a developing standard and is divided into a number of parts. Companies promoting MPEG-4 compatibility do not always clearly state which "part" level compatibility they are referring to. The key parts to be aware of are MPEG-4 part 2 (including Advanced Simple Profile, used by codecs such as DivX, Xvid, Nero Digital and 3ivx and by Quicktime 6) and MPEG-4 part 10 (MPEG-4 AVC/H.264 or Advanced Video Coding, used by the x264 encoder, by Nero Digital AVC, by Quicktime 7, and by high-definition video media like Blu-ray Disc).

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