0 
try {
        descriptors = ParcelFileDescriptor.createPipe();
    } catch (IOException e) {
        e.printStackTrace();
    }
    parcelRead = new ParcelFileDescriptor(descriptors[0]);
    parcelWrite = new ParcelFileDescriptor(descriptors[1]);
    inputStream = new ParcelFileDescriptor.AutoCloseInputStream(parcelRead);

媒体记录器 = 新媒体记录器（）；

    // Step 1: Unlock and set camera to MediaRecorder
    mCamera.unlock();
    mediaRecorder.setCamera(mCamera);

    // Step 2: Set sources
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);

    // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)

    mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P));



    // The bandwidth actually consumed is often above what was requested

    // Step 4: Set output file
    mediaRecorder.setOutputFile(parcelWrite.getFileDescriptor());

    // Step 5: Set the preview output
    mediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
    
    
     mediaRecorder.prepare();

     mediaRecorder.start();
     

   

 E/MediaRecorder: start failed: -2147483648 0xb400007c921b82c0

W/System.err：java.lang.RuntimeException：启动失败。W/System.err：在 com.googleDev21ex.videorecorder.VideoRecordActivity2$2$1$1.run(VideoRecordActivity2.java:150) 的 android.media.MediaRecorder.start(Native Method) 在 android.os.Handler.handleCallback(Handler.java :938) 在 android.os.Handler.dispatchMessage(Handler.java:99) 在 android.os.Looper.loop(Looper.java:239) 在 android.app.ActivityThread.main(ActivityThread.java:8212) 在 java .lang.reflect.Method.invoke(Native Method) 在 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:626)

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