Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs.
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20.1 MB
Free
It took 5 minutes to fix an mkv, just opened the file in the app, let it do the job and saved a copy, done. In the app preview the audio was not in sync but in the saved file it was OK