MKVToolnix Muxing Append Error: Can't Append File to Itself

[koberulz]

I'm getting this error from MKVToonixGUI: "Files cannot be appended to themselves. The argument for '--append-to' was invalid."

Which, as error messages go, is pretty unambiguous. Only issue is I'm trying to append a file named "1.mkv" to a file named "2.mkv". Clearly, those aren't the same file.

So why am I getting this error? Here's the actual command line:

C:/Program Files/MKVToolNix\mkvmerge.exe --ui-language en --output M:\Backups\Temp\output.mkv --language 0:eng --language 1:eng --track-name 1:Dolby Digital 2.0 --default-track 1:yes ( M:\Backups\Temp\1.mkv ) + ( M:\Backups\Temp\2.mkv ) --track-order 0:0,0:1 --append-to 1:0:0:0,1:1:0:1,1:2:1:1

[sneaker]

--append-to 1:0:0:0,1:1:0:1,1:2:1:1

The last pair is 1:2:1:1. So you are trying to append track 2 from file 1 to track 1 from file 1. Same file.



P.S.:

--track-name 1:Dolby Digital 2.0

Probably want

--track-name "1:Dolby Digital 2.0"

[koberulz]

Ah, the second clip has a spare audio track I hadn't noticed. Unchecking that fixes the issue.

I'm using MKVtoolnixGUI, not the command line interface. To post here I just went to the "show command line" option and removed escaping so it'd be more readable.