The Matroska video file format, .mkv, is an open source video file container which is part of the larger open source Matroska Multimedia Container which includes .mka (audio), .mks (subtitles), and .mk3D (stereoscopic video). It was first developed in 2002 and is today favored by many video authors because of the size of produced files. In 2010 the mkv format became the basis of the popular browser independent open format called WebM with several free video players providing playback support for video files encoded in .mkv. Microsoft Windows does not have native support for .mkv video files but there are plans to include native playback support in Microsoft's upcoming operating system Windows 10.
The advanced audio coding audio format or AAC format for short is a standardized audio encoding format designed to succeed the popularized mp3 format. It is the result of the collaborative efforts of several companies including bell labs, Nokia, and Sony among others. It was initially released in 1997 as part of the lossy digital audio compression family of audio encoding formats. AAC enjoys a wealth of native compatibility and support by different platforms, hardware, and software applications including video game consoles such as the PlayStation 3, Nintendo DSi, and platforms such as Android, and YouTube. Today even diverse hardware such as in dash car audio players have native support for the format.
FreeFileConvert uses tuned encoding for MKV to AAC conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload MKV files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized AAC results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent AAC audio with dependable progress tracking.
Any video player that supports DirectShow parser filters can play .mkv files once the correct decoder filers for the video file are installed. Players such as VLC or Xine have native support for .mkv files which eliminates the need to install the DirectShow decoder filter onto the operating system. The .mkv file format is capable of supporting chapter points, subtitles, different audio streams, video, and well as metadata such as file descriptions, synopsis, cover art and more.
The AAC supports stereo playback at a maximum and acceptably modest 96 kilobits per second. Sample frequencies can range from 8 to 96 kilo hertz, and maximum number of supported channels is 48. Resulting AAC file sizes are typically smaller in comparison with those of its closest rival format mp3.
Upload your video file in the MKV format from your device, Dropbox, or Google Drive.
Select AAC as the output format and click Convert. Adjust optional settings if needed.
Download the converted audio file. Each file stays available for up to 5 downloads.