Original width, not cropped width used when appending files for remux

I have 2 video files that I want to combine by appending one to another using MKVToolNix v96.0.

I got an error saying they had different widths - indeed they did! (1906 and 1908).

So I cropped the 1908 down to 1906.

Media Info tool says: Width is 1906 and Original width is 1908

When I try combining them again in MKVToolNix, I continue to get the error that they cannot be combined because they have different widths.

Could it be that the ‘original width’ field is used instead of the width field?

Welcome!

In Matroska you cannot append tracks with different pixel dimensions. What you set the “crop” fields to doesn’t matter as that doesn’t alter the pixel dimensions. All it does is set four header fields & tell the player to apply a crop filter upon playback.

MKVToolNix is not a video editor. It cannot do destructive cropping, as in: remove pixels from any of the four sides.

Ah! I did not realise that changing the size was an inline adaption during playback.
Thank you for explaining that. Appreciated.