从kitkat上的android应用程序内部录制屏幕会创建一个空白电影

Question

我试过这个

Process process = Runtime.getRuntime().exec("screenrecord --bit-rate 8000000 --time-limit 30 /sdcard/xyz.mp4");
                BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(process.getInputStream()));

但录制后视频的大小为0字节