Question

Q1。我可以同时使用setVideoFrameRate和setCaptureRate吗？任何人都可以解释这些差异以及何时使用这两者中的哪一个？

Q2。以下代码流程是否正确？我 Nexus 7（2013）Android 4.3 前置摄像头 MediaRecorder启动失败：-19 错误。使用后置摄像头，相同的代码完美无缺，没有任何错误。任何人都可以更正下面的代码以及为什么它背面而不是前置摄像头？

public void saveVideo(int resX, int resY, int bitRate, int fps, Camera camera){

        File tempFile = null;
        MediaRecorder mediaRecorder = null;
        try{                                    

            tempFile = new File("/storage/emulated/0/Pictures/MyCameraApp/"+"_"+resX+"x"+resY+"_"+bitRate+"_"+fps+".mp4");                  

            mediaRecorder = new MediaRecorder(); 
            camera.unlock();            
            mediaRecorder.setCamera(camera);
            mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);                              
            mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);                       
            mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);                       
            mediaRecorder.setVideoSize(resX, resY);
            mediaRecorder.setVideoFrameRate(fps);   
            //mediaRecorder.setCaptureRate(fps);
            mediaRecorder.setVideoEncodingBitRate(bitRate);         
            mediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener()
            {

                @Override
                public void onError(MediaRecorder mr, int what, int extra) {
                    Log.i("MainActivity", "MediaRecorder Error");
                }

            });

            mediaRecorder.setOutputFile(tempFile.toString());
            mediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());
            mediaRecorder.prepare();                
            mediaRecorder.start();

            Thread.sleep(5000); // Recording for 1 second
        }
        catch (InterruptedException interrptedException ) {

        }
        catch ( IOException ioException){

        }
        catch(IllegalStateException illegalState){

        }

        if (mediaRecorder != null) {    

            try {
                mediaRecorder.stop();
            }
            catch (IllegalStateException illegal){

            }
            mediaRecorder.reset();   // clear recorder configuration
            mediaRecorder.release(); // release the recorder object
            mediaRecorder = null; 

        }
            camera.lock();


}

Answer 1

setCaptureRate用于延时案例。 setVideoFrameRate用于正常记录案例。

如果setCaptureRate失败，可能您的设备不支持延时模式。

setVideoFrameRate和setCaptureRate / MediaRecorder启动失败：-19？

1 个答案: