Quote:
Originally Posted by markfilipak
I discovered (the hard way) that MKVToolNix doesn't handle things well if the input and output are the same file name.
It would be nice if overwriting were possible.
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Overwriting a file you're reading from is definitely not supported and never will be. mkvmerge should abort with an error message if this is attempted.
The are several reasons, e.g. there's a distinct possibility that data to be written is generated faster than data is read from the source file; in that case data that hasn't been read yet would be overwritten by the output data. Not a good idea.