m4b-tool

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Recently I was trying to diagnose an issue with the output file not being writable. It was frustrating that m4b-tool would spend ages doing the conversion then everything is lost right at the end when it turns out the destination is not writeable.

Please consider adding a check to ensure file is writable before starting the whole process and warn the user or abort the job if it is not.

This is a good suggestion, I'll try to implement this. However, it's not as easy as it sounds, because the output file name is dynamic / replaceable with variables. Some of them may partly depend on the encoded files, but I'll try what I can do.