MP4 to AAC
Convert your video files quickly and easily with our professional online converter
Input Format
What is MP4?
MP4 (MPEG-4 Part 14) is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. It is a standard specified as a part of MPEG-4.
History
MP4 was introduced in 2001 as a successor to the MPEG-4 Part 12 format. It was developed by the Moving Picture Experts Group (MPEG) and is based on the QuickTime File Format (QTFF) used by Apple's QuickTime framework.
How it works
MP4 files contain various types of data streams, including video, audio, and metadata. The format uses a hierarchical structure of boxes (also called atoms) to organize the data. Each box contains a specific type of information, such as video frames, audio samples, or metadata about the content.
How to open MP4 files
MP4 files can be opened with most modern media players and devices. Here are some common ways to open MP4 files:
- Windows Media Player
- VLC Media Player
- QuickTime Player (Mac)
- iTunes
- Windows 10 Movies & TV app
- Most web browsers (for streaming)
- Most smartphones and tablets
Tips for working with MP4 files
Here are some useful tips when working with MP4 files:
- MP4 files are widely supported across different platforms and devices
- They offer good compression while maintaining quality
- MP4 files can contain multiple audio tracks and subtitles
- The format supports streaming and progressive download
- MP4 files can be easily shared and uploaded to various platforms
Useful links
For more information about MP4 files, you can visit these resources:
- MPEG-4 Part 14 Specification]
- ISO/IEC 14496-14:2003 Standard
- MP4 File Format Documentation
Output Format
What is AAC?
AAC (Advanced Audio Coding) is a modern lossy audio codec that delivers better quality than MP3 at the same bitrate. The .aac extension is common in streaming, mobile devices, and video containers.
History
AAC was standardized by the MPEG group in the late 1990s as the successor to MP3 and became the default codec for many platforms.
How it works
AAC uses advanced psychoacoustic models and flexible block sizes to compress audio efficiently while preserving clarity at lower bitrates.
How to open AAC files
AAC plays on most modern devices and media players:
- Apple Music or iTunes
- VLC Media Player
- Windows Media Player
- Android music players
- Foobar2000
- Audacity
- Most smartphones and tablets
Tips for working with AAC files
AAC is a strong choice for streaming and portable audio:
- Use AAC for better quality at low bitrates
- Store AAC in M4A for metadata support
- Avoid re-encoding from AAC to AAC
- Convert to MP3 for older devices
- Keep a lossless master for archiving
Useful links
More about AAC and modern audio coding:
- MPEG AAC overview
- AAC vs MP3 comparison
- Streaming audio best practices
Why Choose Our Converter?
Free
IloveMP4 is free to use and allows you to convert your video file easily
Fast
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Secure
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Quality
IloveMP4 always offers the best quality conversion.
Frequently Asked Questions
File Size & Length
Maximum file size?
Up to 4GB for free users. For larger files, use our video compressor or upgrade.
Maximum video length?
No length restrictions - convert videos of any duration.
Conversion Options
Change format?
Use our converter for any format. Try our compressor to reduce file size.
Change frame rate?
Use our FPS changer or compressor.