How to use SetPtsFilter to set video pts?

[MrSSai]

Hello,
I'm new in ws.schild. I want to do it like use ffmpeg -filter:v "setpts=0.5*PTS", but when I use SetPtsFilter() to VideoAttributes().addFilter() method, it doesn't work. This is my code, can you help me?

public class VideoTranscoder {
    public static void main(String[] args) throws EncoderException {
        String inputPath = "/home/user/video.mp4";
        String outputPath = "/home/user/output.mp4";


        SetPtsFilter setPtsFilter = new SetPtsFilter();
        setPtsFilter.addInputLabel("0.5*PTS");

        VideoAttributes video = new VideoAttributes();
        video.setCodec("libx264");
        video.setFrameRate(30);
        video.addFilter(setPtsFilter);

        EncodingAttributes attrs = new EncodingAttributes();
        attrs.setOutputFormat("mp4");
        attrs.setVideoAttributes(video);

        Encoder encoder = new Encoder();
        MultimediaObject mediaObject = new MultimediaObject(new File(inputPath));
        encoder.encode(mediaObject, new File(outputPath), attrs);
        System.out.println("Video transcoding complete.");
    }
}