Command line arguments

-i/--input: file path(s): Specify input video file paths, use quotes if they contain spaces.
-o/--output: file path: Specify a single output video's path (do not use if multiple paths are supplied in --input, consider --outdir).
-t/--tui: bool: Makes Smoothie behave like an app instead of a CLI tool (e.g pause before exiting on an error).
--outdir: folder path: Specify output directory for all queued files, overrides [miscellaneous] global output folder:.
--peek: int: Render out frame number specified as an image file, useful when peeking to see what a frame will look like with a very slow recipe. This is passed to both --start and --end to VSPipe and does not mess up any temporal filters afaik.
--vpy: file path: Override the default vapoursynth python script to use (default: jamba.vpy).
--stripaudio: bool: No audio tracks will be added back when encoding the output video.
--tonull: bool: Makes VSPipe output to null (just adds . to arguments instead of piping Y4M to ffmpeg).
--tompv: bool: Redirects Y4M output to mpv, simple implementation: it tries to grab it from PATH.
--json: string: Trimming timecodes payload for suckless-cut, not fully ported from smoothie-py yet.
--trim, --padding: bool: Trimming behavior, not fully ported from smoothie-py yet.
--rerun / -!!: bool: Each time Smoothie runs, it dumps all arguments to last_args.txt, if smoothie crashes and you had given it a bunch of arguments that you lost, use this argument to grab them back, inspired from bash syntax e.g sudo !!.
--encargs: string: Overrides [output] enc args:.
-v/--verbose: bool: Prints verbose information, useful for debugging / curious folk.

-r/--recipe: file path: Specify a recipe path, defaults to recipe.ini.
--override: string: Override any recipe settings, e.g. --override "flowblur;amount;40", can be used multiple times.