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MP4

(MP4) MPEG-4 Part 14 or MP4 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. Like most modern container formats, it allows streaming over the Internet.

MKV

(MKV) MKV files are not an audio or video compression format. They are multimedia container formats that can incorporate video, audio and text in a single file.
Using Filer You Can Convert From Many different File Types. Filer Convert Between Many Audio Formats and Ensure Materials/Textures Are Applied. Windows, Linux, MacOS, Android or Mobile are Supported. Filer Supports bulk conversions, works offline, can be saved as a Progressive Web App (PWA), and recieves frequent updates. Filer can host your audio files for free and allow anyone to access them over the web. Convert between AAC, AC3, AVI, AIF, AIFC, AIFF, FLAC, FLV, OPUS, M4V, MOV, MP2, MP3, MP4, MKV, MPEG, MPG, OGA, OGG, SWF, WAV, WEBM, WMA!
  1. Convert From: AAC, AC3, AVI, AIF, AIFC, AIFF, FLAC, FLV, OPUS, M4V, MOV, MP2, MP3, MP4, MKV, MPEG, MPG, OGA, OGG, SWF, WAV, WEBM, WMA
  2. Save As: AAC, AC3, AVI, AIF, AIFC, AIFF, FLAC, FLV, OPUS, M4V, MOV, MP2, MP3, MP4, MKV, MPEG, MPG, OGA, OGG, SWF, WAV, WEBM, WMA

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