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instead of only AV-specific options. The previous code assumed that any option not defining the codec in an `ffpreset` file is an AVOption. This for example prevented the use of options defined in `OptionDef[]`, like `-pix_fmt`, as part of preset files, requiring users to type these out every time. Closes: #1530 Signed-off-by: Andreas Hartmann <hartan@7x.de>