Well, i can recommend another one as well (nice and simple)
Avidemux
http://fixounet.free.fr/avidemux/
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Open your video file ( Video Output *Copy*)
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Audio Output *AC3 (Aften)* select configure and filters (see picture for settings) *
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Output Format If your video is MKV then select MKV Muxer
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File > Save … wait about 10-15 Minutes (depends on the size of your video)
* usually i dont change the audio filters… but in this case i would recommend you do it
