Cannot use lut3d .cube filter

[flow-dev]

I'd like to apply ”lut3d" using my .cube file,
but the .cube argument is not given anymore.

I thought there was a problem with the path of the. cube file,
I tried changing the location but did not change...

".on('start', function(commandLine) {"
log is " -filter_complex lut3d="SLog3_SG3c_.cube" " Accurate command.

If ffmpeg alone, I can use lut3d without problems,
but node-fluent-ffmpeg cannnot this cmd ...

Please tell me how to write the code.

Version information

• fluent-ffmpeg version: 2.1.2
• ffmpeg version: 4.0.0
• OS: Windows10

Code to reproduce

var proc = ffmpeg(input_name)
        .complexFilter([
            {
                "filter":lut3d,
                //"input": "SLog3_SG3c_.cube"
            }
        ])
        .on('start', function(commandLine) {
            console.log('Ffmpeg with command: ' + commandLine);
        })
        .on('end', function() {
            console.log('file has been converted succesfully');
        })
        .on('error', function(err) {
            console.log('an error happened: ' + err.message);
        })
        .save(output_name);

(note: if the problem only happens with some inputs, include a link to such an input file)

Expected results

an error happened: ffmpeg exited with code 1: Error initializing complex filters.
Invalid argument

Observed results

Checklist

• I have read the FAQ
• I tried the same with command line ffmpeg and it works correctly (hint: if the problem also happens this way, this is an ffmpeg problem and you're not reporting it to the right place)
• I have included full stderr/stdout output from ffmpeg