GrEEK_OuTcAsT: are you sure they are not written to the file? or is it just your player doesn't know what to do with it? Because if its a player issue no additional tool can fix it..
I set my aspect ratio always on muxing with mkvmerge and it always worked so far. The shell extesions shows it and both MPC and TCMP use it correctly (and these are the only players i use).
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-nyo
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