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TL DR: go to, download MKVToolNix, and use the command line to merge mkv's. The merged file ran cleanly in vlc, with no hiccups at the stitchpoint. The above code merged file1.mkv (which I had placed in the mkvtoolnix directory) with file2.mkv (which I had located in a different directory), and placed the merged file (combined.mkv) in a third directory.
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It seemed to me that changing the source directories for either of the original mkv's (file1.mkv, file2.mkv) should be possible as well, so I next tried this: C:\Program Files (x86)\MKVToolNix>mkvmerge file1.mkv + C:\Users\User1\Documents\file2.mkv -output C:\Users\User1\mkvfolder\combined.mkv mkvmerge: AV1 OBU parser: fixed identifying files that only contain single. This stitched two mkv files together (that were located in the MKVToolNix folder), and puts the combined.mkv file in a different directory. MKVToolNix GUI: when adding directories via drag & drop/copy & paste the GUI will now offer the user the option to create one multiplex settings tab per directory & adding all files from that directory to the corresponding, newly created tab.
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It looked something like this: C:\Program Files (x86)\MKVToolNix>mkvmerge file1.mkv + file2.mkv -output C:\Users\User1\mkvfolder\combined.mkv using the "mkvmerge -help" command, I was able to determine the appropriate command to stitch mkv files together. As I continued researching, I discovered a download page that also contained a review of mkvtoolnix ( ) that referred to some cmd commands he tested along with the standard GUI test.
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