[ubuntu] How to MKV to MP4 & burn subtitle with mencoder by same input quality ?

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http://ubuntuforums.org – Now I have file .mkv (included 3 streams) 1.Video 2.Audio 3.Subtitle I want to convert from MKV to MP4 by Mencoder Program with requirement on list 1.subtitle and video blend together in 1 stream 2.video same input quality 3.file target size same input too How to write command for render this project ? ps. Sorry for bad English Thank you (Hardware)