致命异常：CameraX 音频编码线程

Question

我正在使用相机 X 库录制视频。当我在此之前拍摄视频 5 秒（即）两秒时，如果我关闭视频，它会因上述错误而崩溃。如何在 android cameraX 库中处理此运行时异常

E/AndroidRuntime: FATAL EXCEPTION: CameraX-audio encoding thread
Process: .debug, PID: 4625
java.lang.IllegalStateException
    at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
    at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:2698)
    at androidx.camera.core.VideoCapture.audioEncode(VideoCapture.java:705)
    at androidx.camera.core.VideoCapture$1.run(VideoCapture.java:340)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:201)
    at android.os.HandlerThread.run(HandlerThread.java:65)

有时会出现以下问题

FATAL EXCEPTION: CameraX-video encoding thread
Process: <packagename>, PID: 10794
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.media.MediaCodec.dequeueOutputBuffer(android.media.MediaCodec$BufferInfo, long)' on a null object reference
    at androidx.camera.core.VideoCapture.videoEncode(VideoCapture.java:604)
    at androidx.camera.core.VideoCapture$2.run(VideoCapture.java:348)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.os.HandlerThread.run(HandlerThread.java:65)

在这个示例中还没有修复 https://github.com/android/camera-samples/issues/2#issuecomment-546812852

Answer 1

通过向videoCapture.startRecording(videoFile, executor, onVideoSavedCallback); 添加回调，您应该能够处理onError 方法中的异常。

/**
 * Define callback that will be triggered after a video has been taken and saved to disk
 */
private VideoCapture.OnVideoSavedCallback onVideoSavedCallback= new VideoCapture.OnVideoSavedCallback() {
    @SuppressLint("RestrictedApi")
    @Override
    public void onVideoSaved(@NonNull File file) {
        Log.d("VIDEO_CAPTURE", "Video capture succeeded");
    }

    @Override
    public void onError(int videoCaptureError, @NonNull String message, @Nullable Throwable cause) {
        Log.e("VIDEO_CAPTURE", "Video capture failed");
        if (cause != null) {
            cause.printStackTrace();
            Toast.makeText(context,"Video capture failed",Toast.LENGTH_LONG).show();
        }
    }
};