Am I correct in thinking that, when using toolnix to change the Aspect Ratio, you have to create a new file? As far as I can see, Header Editor can change a file in many ways but Aspect Ratio doesn't seem to be one of them. Thank you.
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You can do it with the Header Editor. It's "Video display width"+"Video display height" of the video track (default unit is in number of pixels).
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Niiice... At first, I thought that '4' and '3' would be inappropriate values for those boxes but it works. Thanks, sneaker.
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They are inappropriate unless you also set "Video display unit" to "3"(=aspect ratio). By default "Video display width" and "Video display height" are supposed to be in pixels.
https://www.matroska.org/technical/specs/index.html#DisplayUnit
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