Flutter ffmpeg_kit_flutter: get FFmpegKit.executeAsync error

Question

I have prepared a test program to run FFMPEG command and it successfully run -i "/data/user/0/com.example.test/cache/file_picker/test.mp4" -c:v mpeg4 "/data/user/0/com.example.test/cache/test-1639310478143.mp4" command. This is just to ensure that ffmpeg_kit_flutter was loaded properly and all permissions has been obtained.

But, I have problem executing -i "source.mp4" -vf fps=30 "thumb%03d.jpg" -hide_banner command. The command itself is working well when I run it on windows, for example:

md frame1
ffmpeg -i "test.mp4" -vf fps=30 frame1/thumb%%04d.jpg -hide_banner

(note: double % is to escape the % in windows batch file)

This is what I do in flutter on android:

1. Create temporary folder.
2. Execute:

    String command = '-i "/data/user/0/com.example.test/cache/file_picker/test.mp4" -vf fps=30 "/data/user/0/com.example.test/cache/tmp-1639309602536/thumb%03d.jpg" -hide_banner';
    FFmpegKit.executeAsync(command, (session) async {
        final returnCode = await session.getReturnCode();
        if (ReturnCode.isSuccess(returnCode)) {
            //ok
        } else if (ReturnCode.isCancel(returnCode)) {
            //cancelled
        } else {
            //error
        }
    });

The proses is not working (always going to the error part). My questions are:

1. What is the difference between running that command on windows and android? Why it works on windows but not working on android?
2. How can I get the explanation about any FFMPEG error? In my case, I only know that wasn't working, but I have no clue why.