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Description
When trying to download a video that must be downloaded as multiple fragments (I tried with https://www.france.tv/france-5/c-etait-ecrit/1988449-le-brexit.html as an example, in case there are several different manners of "multiple fragments"), any kind of OS error on download (e.g., insufficient permissions, read-only filesystem, etc.) seem to simply result in the error message "ERROR: unable to download video" without any hint as to what the underlying error was.
For example, if I create a directory in which I have no write permission and try to run youtube-dl on the aforementioned URL, all I get is "ERROR: unable to download video" with no explanation as to the fact that it's a "permission denied" error.
If this is too difficult to fix, please at least add something like "try to run with -v option for more verbose output" as a hint to this "unable to download video" error, because -v does indeed provide a clue as to the underlying root cause.