Android 媒体记录器输出文件大小 0KB

如何解决Android 媒体记录器输出文件大小 0KB

我正在使用 MediaRecorder 录制视频，它在大多数设备上都可以正常工作。但在小米 A2、三星 J2、J7 等少数设备上，无论操作系统版本如何，输出录音文件大小均为 0KB。我在清单中打开了 requestLegacyExternalStorage 模式。此外，我尝试创建和保存文件以检查文件生成是否存在任何问题，但没有。我已经添加了下面的大部分代码。

媒体文件生成代码：

public File getoutputMediaFile() {

        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES),"Liveliness");


        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                Log.d("Liveliness","Failed to create directory");
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File videoFile;
        videoFile = new File(mediaStorageDir.getPath() + File.separator +
                "REC_" + timeStamp + ".mp4");



        return videoFile;
    }

相机准备代码。

 mCamera = cameraSource.getCameraInstance();
        mediaRecorder = new MediaRecorder();

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

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

        // Step 3: Set a format
        mediaRecorder.setoutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

        mediaRecorder.setVideoSize(720,480);
        mediaRecorder.setorientationHint(270);

        CamcorderProfile cpHigh = CamcorderProfile.get(cameraSource.getRequestedCameraId(),CamcorderProfile.QUALITY_480P);
        // Set the video encoding bit rate this changes for the high,low.
        // medium quality devices
        mediaRecorder.setVideoEncodingBitRate(cpHigh.videoBitRate);

        //Set the video frame rate
        mediaRecorder.setVideoFrameRate(cpHigh.videoFrameRate);

        // Step 4: Set output file
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mediaRecorder.setoutputFile(getoutputMediaFile());
        }else{
            mediaRecorder.setoutputFile(getoutputMediaFile().getPath());

        }

        // Step 5: Set the preview output
        mediaRecorder.setPreviewdisplay(surfaceView.getHolder().getSurface());

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            mediaRecorder.setInputSurface(MediaCodec.createPersistentInputSurface());
        }

mediaRecorder.prepare();