java ffmpeg wrapper Unknown decoder 'copy'

Hi I want to run ffmpeg -f concat -i test.txt -c copy output.mp4 in java. My FFmpegBuilder :

        FFmpeg ffmpeg = new FFmpeg("C:\\ffmpeg\\bin\\ffmpeg.exe");
        FFprobe ffprobe = new FFprobe("C:\\ffmpeg\\bin\\ffprobe.exe");

        FFmpegBuilder builder = new FFmpegBuilder()
                .setInput(path + fileName)
                .addExtraArgs("-f", "CONCAT")
                .addExtraArgs("-i", path+ "test.txt")
                .addExtraArgs("-c", "copy")
                .addOutput("outjava.mp4")
                //.setAudioCodec("COPY")
               // .setVideoCodec("COPY")
                .done();


        FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);
        executor.createJob(builder).run();

But I get always the error:

Unknown decoder 'copy'
Exception in thread "main" java.lang.RuntimeException: java.io.IOException: C:\ffmpeg\bin\ffmpeg.exe returned non-zero exit status. Check stdout.
    at net.bramp.ffmpeg.job.SinglePassFFmpegJob.run(SinglePassFFmpegJob.java:46)
    at Main.main(Main.java:47)
Caused by: java.io.IOException: C:\ffmpeg\bin\ffmpeg.exe returned non-zero exit status. Check stdout.
    at net.bramp.ffmpeg.FFcommon.throwOnError(FFcommon.java:51)
    at net.bramp.ffmpeg.FFcommon.run(FFcommon.java:113)
    at net.bramp.ffmpeg.FFmpeg.run(FFmpeg.java:184)
    at net.bramp.ffmpeg.FFmpeg.run(FFmpeg.java:202)
    at net.bramp.ffmpeg.job.SinglePassFFmpegJob.run(SinglePassFFmpegJob.java:39)
    ... 1 more

Why is it possible to wrap all args into .addExtraArgs, but the -c copy argument is failing? What is my mistake? .setVideoCodec("COPY") is also failing

Solution

-c copy is an output argument.

Place .addExtraArgs("-c", "copy") after addOutput("outjava.mp4"):

FFmpegBuilder builder = new FFmpegBuilder()
        .setInput(path + fileName)
        .addExtraArgs("-f", "concat")
        .addExtraArgs("-i", path+ "test.txt")
        .addOutput("outjava.mp4")
        .addExtraArgs("-c", "copy")
        .done();

Note: I didn't had the chance to test my answer.
According to the following examples, it should work.

Please note that concat demuxers with -c copy only works when all the input files have the same characteristics.