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  1. I've been trying to use MKVToolNix GUI 63.0 to change the aspect ratio of some .mkv files. I opened the program, dragged and dropped a file into the program, but the option to change the aspect ratio is grayed out. What am I missing?
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  2. Member
    Join Date
    Mar 2008
    United States
    Search Comp PM
    You have to highlight the video in the bottom pane to make it active
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  3. Thanks . . . that did it.
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