MKV to AAC
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Input Format
What is MKV?
MKV (Matroska Video) is an open, free container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in a single file. It is designed to be a universal format for storing common multimedia content, like movies or TV shows.
History
MKV was developed by the Matroska team, starting in 2002. It was created as an open alternative to proprietary container formats, with the goal of providing a flexible, extensible format for multimedia content.
How it works
MKV files use a flexible structure that can contain multiple video and audio tracks, along with subtitles, chapters, and metadata. The format supports a wide range of codecs, making it versatile for various types of media content.
How to open MKV files
MKV files can be opened with various media players and devices. Here are some common ways to open MKV files:
- VLC Media Player
- Media Player Classic
- PotPlayer
- Most modern web browsers
- Many media players on mobile devices
- Kodi
- Plex
Tips for working with MKV files
Here are some useful tips when working with MKV files:
- MKV files can contain multiple audio and subtitle tracks
- They support a wide range of video and audio codecs
- The format is open and free to use
- MKV files are ideal for high-quality video storage
- They can be easily converted to other formats
Useful links
For more information about MKV files, you can visit these resources:
- Matroska Project Documentation
- MKV File Format Specification
- Matroska Developer 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
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Quality
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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.