Path to the ffmpeg executable.
Enable processing of FFmpeg's logs. When set, on each log message written by ffmpeg, depending on the log level, the corresponding log function will be called. Note that with very verbose log levels it may have a noticeable effect on performance.
Enable dumping full command line args and logs to a specified file. https://ffmpeg.org/ffmpeg-all.html#Generic-options
Add custom options that will be used to spawn the process. https://nodejs.org/docs/latest-v12.x/api/child_process.html#child_process_child_process_spawn_command_args_options