我尝试构建自定义视频录制应用，并按照互联网上的教程进行操作。但是我遇到了按下开始按钮后屏幕变黑的问题，没有其他事情发生。按下停止按钮后，我检查了输出视频的目录。它在那里，但大小是0 KB。
我使用了surfaceview，这是xml布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="- Start Camera Preview -"
/>
<Button
android:id="@+id/stop"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="- Stop Camera Preview -"
/>
<SurfaceView
android:id="@+id/surfaceview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
以下是录制视频的简要代码：
public class CamTestActivity extends Activity implements SurfaceHolder.Callback{
private static final String TAG = "Camera-Tutorial";
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Camera camera;
private boolean previewRunning;
private int VIDEO_TYPE = 3;
private int intVideoIndex = 1;
private MediaRecorder mediaRecorder;
private final int maxDurationInMs = 20000;
private final int videoFramesPerSecond = 20;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.videopreview);
// setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
Button start_video = (Button) findViewById(R.id.start);
Button stop_video = (Button) findViewById(R.id.stop);
stop_video.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mediaRecorder.stop();
camera.lock();
}
});
start_video.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
camera.unlock();
mediaRecorder = new MediaRecorder();
mediaRecorder.setCamera(camera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mediaRecorder.setOutputFile(GetOutputMediaFileDir(VIDEO_TYPE,intVideoIndex));
mediaRecorder.setVideoFrameRate(1);
mediaRecorder.setVideoEncoder(MediaRecorder.AudioEncoder.AAC);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
// Log.e(TAG,e.getMessage());
// e.printStackTrace();
} catch (IOException e) {
Log.e(TAG,e.getMessage());
// e.printStackTrace();
}
}
});
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
if (camera != null){
Camera.Parameters params = camera.getParameters();
camera.setParameters(params);
}
else {
Toast.makeText(getApplicationContext(), "Camera not available!", Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (previewRunning){
camera.stopPreview();
}
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(width, height);
camera.setParameters(p);
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
previewRunning = true;
}
catch (IOException e) {
Log.e(TAG,e.getMessage());
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
previewRunning = false;
camera.release();
}
public static String GetOutputMediaFileDir(int fileType, int index){
String fileDir=null;
String strIndex = Integer.toString(index);
if(fileType == 1)
{
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MUSIC), "Audio");
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
return null;
}
}
fileDir = mediaStorageDir.getPath() + File.separator +
"AUDIO_"+ strIndex + ".mp4";
}
if(fileType == 2)
{
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "Image");
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
return null;
}
}
fileDir = mediaStorageDir.getPath() + File.separator +
"IMAGE_"+ strIndex + ".jpeg";
}
if(fileType == 3)
{
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MOVIES), "Video");
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
return null;
}
}
fileDir = mediaStorageDir.getPath() + File.separator +
"VIDEO_"+ strIndex + ".mp4";
}
return fileDir;
}
}
如何解决问题的任何想法？非常感谢。
解决问题的变化：
首先我将视频编码器设置为音频编码器，应该更改;
其次mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());应在mediaRecorder.prepare()
然后它正常工作。
答案 0 :(得分：0)
我在HTC Incredible设备上遇到过这个问题，但它在我测试过的其他8个设备上完美运行。这是“解决”这个问题的帖子：
https://stackoverflow.com/a/9903357/1426565
我将实际修正范围缩小到特定行：
recorder.setVideoSize(width, height);
帧率/比特率设置与修复无关，我不确定使用DEFAULTs来源，输出格式和编码器是否会改变任何东西，但是如果你考虑它，它根本不会影响它。
这些是我正在使用的其他设置（确保在任何编码器之前设置尺寸）：
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
recorder.setPReviewDisplay(surfaceView.getHolder().getSurface())
另请注意，在昨天的ICS测试中，我们遇到了一个不支持setFrameRate的问题，以及不支持setVideoSize。因此，在我即将尝试的修复中，我将使用try / catch块包围setVideoSize，删除setFrameRate，并希望上帝修复它。如果没有，我可能不得不在某些设备上将其排除。