Another option is to use the same approach as find -exec. 

prog [options] --ffmpeg [ffmpeg args] [sentinel] [options] [args]

[download]

I'm not a fan of this approach because of its down sides.

Footnotes:

  1. ";" and "+" serve as sentinels for POSIX find -exec. ";" must be escaped since it already has meaning to the shell, though.

In reply to Re: Parsing a command-line string into an array by ikegami
in thread Parsing a command-line string into an array by bliako

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