When adding water mark by GPU using service, it doest not stop service when stopping service

[KishanViramgama]

When adding water mark by GPU using service, it doest not stop service when stopping service

call gpuMp4Composer.cancel(); but not stop.

gpuMp4Composer = null;
gpuMp4Composer = new GPUMp4Composer(filePath_local , file_path)
        .filter(new GlWatermarkFilter(image, GlWatermarkFilter.Position.RIGHT_BOTTOM))
        .listener(new GPUMp4Composer.Listener() {
            @Override
            public void onProgress(double progress) {
                double value = progress * 100;
            }
            @Override
            public void onCompleted() {             
            }
            @Override
            public void onCanceled() {              
            }
            @Override
            public void onFailed(Exception exception) {             
            }
        })
        .start();