If you’re looking to convert MP4 to MP3, chances are you want to convert an MP4 audio file to play on your MP3 player. But before we move on to cover how to convert the files, let’s go over the main differences between Mp3 and Mp4.
MP4 (MPEG4 Part 14): MPEG-4 Part 14 or MP4 file format, 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 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. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4.
MP3 (MPEG-1, Layer 3): MP3s are small, high quality audio files that can be played on MP3 players or software. An MP3 can be easily created using a home computer, a ripper program that copies a song from a CD to your, and an encoder that converts your music to MP3 format.
Step 1. Free download and install video converter for mac
Then import MP4 files by clicking “Add Files”.
Step 2. Select MP3 as output format
Except MP3, there are many other video and audio formats you could choose. That means you can convert MP4 to MP3, AAC, AIFF, M4A, MOV, VOB, etc. on Mac OS X.
Step 3. Expand the "Output" panel
Use the "Browse" button to select an output directory.
Step 4. Click “Start” to Convert MP4 to MP3 for Mac
Before conversion, you could trim MP3 audio length by setting start time and end time in Trim window.
Done! Now you can enjoy fantastic MP3 audios from MP4 videos via your iPod, iPhone, mobile phones and other MP3 players.