Media Converter and Muxer - Audio Tools v0.2.0 
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Media Converter and Muxer is an easy to use media conversion tool that can :
- Convert video and audio files to MP# format
- Extract the original audio track from a video file (Lossless conversion)
- Combine a video and an audio file together
- Reduce or increase volume of a video or audio file
- Cut a video file into define segment
- Fix syncing issue between audio and video tracks by shifting them
- Rotate a video file by 90, 180, or 270 degrees.
For more information on how to use this tool please visit:
http://add0n.com/media-converter.html
Note: For this converter to work, you will be asked to install a minimal native client. This native client works as a bridge to the well-known FFmpeg converter.
This is WebExtension port of my Media Converter and Muxer add-on