解决Android MediaRecorder录制视频过短问题

java.lang.RuntimeException: stop failed.
  at android.media.MediaRecorder.stop(Native Method)

 /** 开始录制 */
  @Override
  public MediaPart startRecord() {
    if (mMediaObject != null && mSurfaceHolder != null && !mRecording) {
      MediaPart result = mMediaObject.buildMediaPart(mCameraId, ".mp4");

      try {
        if (mMediaRecorder == null) {
          mMediaRecorder = new MediaRecorder();
          mMediaRecorder.setOnErrorListener(this);
        } else {
          mMediaRecorder.reset();
        }

        // Step 1: Unlock and set camera to MediaRecorder
        camera.unlock();
        mMediaRecorder.setCamera(camera);
        mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

        // Step 2: Set sources
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);//before setOutputFormat()
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);//before setOutputFormat()

        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

        //设置视频输出的格式和编码
        CamcorderProfile mProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);
        //        mMediaRecorder.setProfile(mProfile);
        mMediaRecorder.setVideoSize(640, 480);//after setVideoSource(),after setOutFormat()
        mMediaRecorder.setAudioEncodingBitRate(44100);
        if (mProfile.videoBitRate > 2 * 1024 * 1024)
          mMediaRecorder.setVideoEncodingBitRate(2 * 1024 * 1024);
        else
          mMediaRecorder.setVideoEncodingBitRate(mProfile.videoBitRate);
        mMediaRecorder.setVideoFrameRate(mProfile.videoFrameRate);//after setVideoSource(),after setOutFormat()

        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);//after setOutputFormat()
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);//after setOutputFormat()

        //mMediaRecorder.setVideoEncodingBitRate(800);

        // Step 4: Set output file
        mMediaRecorder.setOutputFile(result.mediaPath);

        // Step 5: Set the preview output
        //        mMediaRecorder.setOrientationHint(90);//加了HTC的手机会有问题

        Log.e("Yixia", "OutputFile:" + result.mediaPath);

        mMediaRecorder.prepare();
        mMediaRecorder.start();
        mRecording = true;
        return result;
      } catch (IllegalStateException e) {
        e.printStackTrace();
        Log.e("Yixia", "startRecord", e);
      } catch (IOException e) {
        e.printStackTrace();
        Log.e("Yixia", "startRecord", e);
      } catch (Exception e) {
        e.printStackTrace();
        Log.e("Yixia", "startRecord", e);
      }
    }
    return null;
  }

  /** 停止录制 */
  @Override
  public void stopRecord() {
    long endTime = System.currentTimeMillis();
    if (mMediaRecorder != null) {
      //设置后不会崩
      mMediaRecorder.setOnErrorListener(null);
      mMediaRecorder.setPreviewDisplay(null);
      try {
        mMediaRecorder.stop();
      } catch (IllegalStateException e) {
        Log.w("Yixia", "stopRecord", e);
      } catch (RuntimeException e) {
        Log.w("Yixia", "stopRecord", e);
      } catch (Exception e) {
        Log.w("Yixia", "stopRecord", e);
      }
    }

    if (camera != null) {
      try {
        camera.lock();
      } catch (RuntimeException e) {
        Log.e("Yixia", "stopRecord", e);
      }
    }

    mRecording = false;
  }

  /** 释放资源 */
  @Override
  public void release() {
    super.release();
    if (mMediaRecorder != null) {
      mMediaRecorder.setOnErrorListener(null);
      try {
        mMediaRecorder.release();
      } catch (IllegalStateException e) {
        Log.w("Yixia", "stopRecord", e);
      } catch (Exception e) {
        Log.w("Yixia", "stopRecord", e);
      }
    }
    mMediaRecorder = null;
  }

  @Override
  public void onError(MediaRecorder mr, int what, int extra) {
    try {
      if (mr != null)
        mr.reset();
    } catch (IllegalStateException e) {
      Log.w("Yixia", "stopRecord", e);
    } catch (Exception e) {
      Log.w("Yixia", "stopRecord", e);
    }
    if (mOnErrorListener != null)
      mOnErrorListener.onVideoError(what, extra);
  }