Tools

Features

• Encoders and decoders are built-in
  Integrates with all audio encoders and decoders - users can convert all supported audio formats, such as M4A to MP3, MP4 to MP3, AAC to MP3, once download the program.
• Easier to use, faster than ever and excellent output quality
  With the concise interface and design, users can easily handle the software without any help. The converting speed is improved and users don't have to wait so long.
• Supports ID3 tag
  All ID3 tags in the original files will be reserved after the conversion.
• Supports batch conversion
  Select all files you want to convert and the MP4 converter will automatically encode them one by one.
• Convert WAV to MP3
• Convert MP4 to MP3, M4A to MP3
• Convert WMA to MP3
• Extract audio from AVI, MPEG, ASF, WMV, DivX, Xvid, 3GP, RM and other video files, convert them to MP3

*.mp4 allows each streaming over the internet. It also allows multiplexing of multiple video and audio streams in one file, variable frame- and bit-rates, subtitles and still images. Apple's QuickTime file format was the start point design of the *.mp4 file format. Although still very reminiscent of each other, *.mp4 has changed and been improved in many different ways apart from *.mov that they are really not the same file format anymore.

*.mp4 is most commonly used as the alternative to *.mp3 on an Apple iPod and in iTunes. The quality of the AAC codec that is stored in *.mp4 is higher than MPEG-1 Audio Layer 3, although not as widely used in computer and hardware players as the *.mp3.

The difference is that MP4 is a "container" and so has the potential to carry video as well. It is expected that it will be used to carry mixed streams of audio and video.

Some file extensions used on files that contain data in the *.mp4 format:
.mp4: official extension, for audio, video and advanced content (see above) files
.m4a: for audio-only files; can safely be renamed to *.mp4, though opinions differ on the wisdom of this.
.m4p: FairPlay protected files
.mp4v, .m4v: video-only (sometimes also used for raw mpeg-4 video streams not in the *.mp4 container format)
.3gp, .3g2: used by 3G mobile phones, may also store content not specified directly in the *.mp4 specification (H.263, AMR, TX3G)

Approximately any kind of data can be embedded in *.mp4 files through private streams, but those that are recommended (for compatibility reasons) are:
Video: MPEG-4, MPEG-2 and MPEG-1
Audio: MPEG-4 AAC, MP3, MP2, MPEG-1 Part 3, MPEG-2 Part 3, CELP (speech), TwinVQ (very low bitrates), SAOL (midi)
Pictures: JPEG, PNG
Subtitles: MPEG-4 Timed Text, and/or xmt/bt text format (means that subtitles have to be translated into xmt/bt)
Systems: Allows animation, interactivity and DVD-like menus

How to convert iTunes M4P to MP3?

How to convert DVD to MP4 for Sony PSP movie?

How to convert AVI/MPEG/Vob files to MP4 for Sony PSP video?

How to convert AVI to MP4 video, MPEG to MP4 video?