Another shellcheck rant...

I have a loop like:

    exec 3< somefile
    while read -ru3 fn; do
ffmpeg -i "$fn" ... "OutDir/$fn"
    done

Shellcheck flags both the "read" and the "ffmpeg", with messages to the
effect that ffmpeg might swallow up stdin - not realizing that the -u3
means the "read" is not reading from stdin.

It recommends using the -nostdin option on ffmpeg, which is weird.  It is
weird that it doesn't understand what -u3 means (which, I get, is
bash-specific, but shellcheck is supposed to know about bash-specific
things), yet it *does* know about an obscure option of an obscure program
called "ffmpeg".

Odd...

Anyway and FWIW, I ended up adding -nostdin, which seems reasonable based
on my reading of the "ffmpeg" man page, and does shut up both shellcheck
messages.

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