Android MediaRecorder 启动失败-19

Question

我正在使用 Live555 开发 Android 流媒体应用程序。因此，我决定分开录制音频和视频来处理流。但不幸的是，当我尝试开始录制时遇到了 RuntimeException。

private void startRecording() throws IOException {
    if (videoRecorder == null) {
        videoRecorder = new MediaRecorder();
        videoRecorder.setPreviewDisplay(preview.getHolder().getSurface());
        videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        videoRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        videoRecorder.setVideoSize(320,24);
        videoRecorder.setVideoFrameRate(25);
        videoRecorder.setOutputFile(video.getFD());
    }

    if (audioRecorder == null) {
        audioRecorder = new MediaRecorder();
        audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
        audioRecorder.setOutputFile(audio.getFD());
    }

    if (!isStreaming) {
        videoRecorder.prepare();
        videoRecorder.start(); // RuntimeException
        audioRecorder.prepare();
        audioRecorder.start();
        isStreaming = true;

    } else {
        stopRecording();
        isStreaming = false;
    }

    Thread t = new Thread(new LiveStreamer(this, video, audio));
    t.setPriority(Thread.MAX_PRIORITY);
    t.start();
}

我在 Internet 上搜索了一段时间，但没有一个成功的解决方案适合我。这是日志:

    01-02 16:17:09.355: E/MediaRecorder(11256): start failed: -19
01-02 16:17:09.355: D/AndroidRuntime(11256): Shutting down VM
01-02 16:17:09.355: W/dalvikvm(11256): threadid=1: thread exiting with uncaught exception (group=0x41884da0)
01-02 16:17:09.355: E/AndroidRuntime(11256): FATAL EXCEPTION: main
01-02 16:17:09.355: E/AndroidRuntime(11256): Process: de.douglasmedia.LiveCam, PID: 11256
01-02 16:17:09.355: E/AndroidRuntime(11256): java.lang.RuntimeException: start failed.
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.media.MediaRecorder.start(Native Method)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at de.douglasmedia.LiveCam.MainActivity.startRecording(MainActivity.java:139)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at de.douglasmedia.LiveCam.MainActivity.access$0(MainActivity.java:116)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at de.douglasmedia.LiveCam.MainActivity$1.onClick(MainActivity.java:66)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.view.View.performClick(View.java:4637)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.view.View$PerformClick.run(View.java:19422)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.os.Handler.handleCallback(Handler.java:733)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.os.Handler.dispatchMessage(Handler.java:95)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.os.Looper.loop(Looper.java:136)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at android.app.ActivityThread.main(ActivityThread.java:5586)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at java.lang.reflect.Method.invokeNative(Native Method)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at java.lang.reflect.Method.invoke(Method.java:515)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
01-02 16:17:09.355: E/AndroidRuntime(11256):    at dalvik.system.NativeStart.main(Native Method)

这是我的 AndroidManifest 的权限部分:

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />

<uses-feature android:name="android.hardware.camra" />

在某处，我读到问题是视频大小。所以，我尝试使用允许的视频尺寸，但得到了同样的错误。有人知道如何解决这个问题吗？感谢您的帮助!

Answer 1

1. 您的视频尺寸不正确，应该是 320x240 而不是 320x24。打字错误？

2. 音频编码器未设置，您需要添加以下行。

   audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB); audioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

3. 使用两个 MediaRecorder 的目的是什么？也许对音频和视频使用一个 MediaRecorder 会更好。

下面的代码部分在 MotoG 设备上对我来说工作正常:

private void startRecording() throws IOException {
    String storage = Environment.getExternalStorageDirectory().getAbsolutePath();
    if (mVideoRecorder == null) {
        mVideoRecorder = new MediaRecorder();
        mVideoRecorder.setPreviewDisplay(mSurfaceView.getHolder().getSurface());
        mVideoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mVideoRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mVideoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        mVideoRecorder.setVideoSize(320,240);
        mVideoRecorder.setVideoFrameRate(30);
        FileOutputStream fileOutputStream = new FileOutputStream(new File(
                storage + "/video.mp4"));
        FileDescriptor fd = fileOutputStream.getFD();

        mVideoRecorder.setOutputFile(fd);
    }

    if (mAudioRecorder == null) {
        mAudioRecorder = new MediaRecorder();
        mAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
        mAudioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        FileOutputStream fileOutputStream = new FileOutputStream(new File(
                storage + "/audio.mp4"));
        FileDescriptor fd = fileOutputStream.getFD();
        mAudioRecorder.setOutputFile(fd);
    }

    mVideoRecorder.prepare();
    mVideoRecorder.start(); // RuntimeException
    mAudioRecorder.prepare();
    mAudioRecorder.start();
}