MKV/AVI to MP4 Alternatives and Similar Software | AlternativeTo
How to Convert an MKV file to an MP4 file with FFMPEG - YouTube
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FFmpeg Tutorial 101 - FFmpeg MKV to MP4 Conversion
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GitHub - SevenbytesSoftware/SevenConverter: Seven Converter | Free Converter for Video and Audio files | Simple tool for converting media files into various formats.
ffmpeg converting from mkv to mp4 without re-encoding - Stack Overflow