In general, arguments are read sequentially into variables and then processed in an internal inscrutable order. Duplicate arguments (e.g. --load-slot=1 --load-slot=2) will result in only the last one taking effect (slot 2 will be loaded.) The desired ROM filename should be last.
Usually, all paths can be relative (where .\ is the directory of the .exe)

Loadstate:

--load-slot=[num]
Loads the specified quicksave slot number (0-9). Overrides the configuration "AutoLoad Last Save Slot"
--load-state=[path]
Loads the specified savestate file. Overrides the configuration "AutoLoad Last Save Slot"

Config File

--config=[path]
Attempts to load a BizHawk config file from the specified path, creating a new config file at this location if it does not already exist.

Movie:

--movie=[path]
Loads specified movie

A/V Capture

--dump-type=[which]
Specifies the type of capture to be done
Valid parameters:
See File | AVI/WAV | Config and Record AVI/WAV in the main program for more details.
--dump-name=[path]
The name of the output file
--dump-length=[numframes]
The length of the capture, in frames. After this many frames have elapsed, A/V capture will automatically stop
--dump-close
If capturing and specifying a dump-length, setting this property will close the emulator after it has reached the length specified in dump-length
--dump-frames=[list_of_frames]
Controls which frames will be dumped. list_of_frames is formatted like: 100,200,300 When this is set, overrides the --dump-length to be equal to the last frame. You could set --dump-length afterwards to pick what you want. Ranges could be added without much trouble. Post a ticket.

Misc

--fullscreen
Will start the emulator in fullscreen mode
--chromeless
Starts the emulator with no window chrome (frame, titlebar, etc.) See DisplayConfig for more.
--gdi
Will force the emulator to startup with the GDI+ display method, useful in case you can't start it up at all
--luaconsole
Opens the Lua console
--lua=[path]
Opens a Lua console and starts the specified script

Bizhawk/CommandLine last edited by Asnivor on 1/8/2019 9:09 AM
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