您好，开发人员，我有一部分可以抓取视频的帧...似乎可以正常工作，但其中一部分会出现非法参数异常...当我设置视频路径时会崩溃。这是我的代码，它在行崩溃
mediaMetadataRetriever.setDataSource（getBaseContext（），uri）
这是完整的代码：
import java.io.IOException;
import android.graphics.Bitmap;
import android.media.MediaMetadataRetriever;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.Toast;
import android.widget.VideoView;
public class MainActivity extends Activity {
MediaMetadataRetriever mediaMetadataRetriever;
MediaController myMediaController;
VideoView myVideoView;
String viewSource = "/storage/test.mp4";
// String viewSource = "/storage/test.mp4";
Uri uri = null;
@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
AssetFileDescriptor afd = getAssets().openFd("test.mp4");
Log.v("MA", "Before setdatasource");
uri = Uri.parse("E:/test.mp4");
mediaMetadataRetriever = new MediaMetadataRetriever();
**mediaMetadataRetriever.setDataSource(getBaseContext(),uri);**
// mediaMetadataRetriever.setDataSource(afd.getFileDescriptor(),
// afd.getStartOffset(), afd.getLength());
Log.v("MA", "After setdatasource" + afd.getStartOffset());
myVideoView = (VideoView) findViewById(R.id.videoview);
Log.v("MA", "VIdeoview found");
myVideoView.setVideoURI(Uri.parse(viewSource));
Log.v("MA", "After setdatasource");
myMediaController = new MediaController(this);
Log.v("MA", "After setdatasource");
myVideoView.setMediaController(myMediaController);
Log.v("MA", "myMediaController initialised");
myVideoView.setOnCompletionListener(myVideoViewCompletionListener);
Log.v("MA", "setOnCompletionListener");
myVideoView.setOnPreparedListener(MyVideoViewPreparedListener);
Log.v("MA", "setOnPreparedListener");
myVideoView.setOnErrorListener(myVideoViewErrorListener);
Log.v("MA", "setOnErrorListener");
myVideoView.requestFocus();
Log.v("MA", "focus set");
myVideoView.start();
Log.v("MA", "video started");
Button buttonCapture = (Button) findViewById(R.id.capture);
buttonCapture.setOnClickListener(new OnClickListener() {
@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
@Override
public void onClick(View arg0) {
int currentPosition = myVideoView.getCurrentPosition(); // in
// millisecond
Toast.makeText(MainActivity.this,
"Current Position: " + currentPosition + " (ms)",
Toast.LENGTH_LONG).show();
Bitmap bmFrame = mediaMetadataRetriever
.getFrameAtTime(currentPosition * 1000); // unit in
// microsecond
if (bmFrame == null) {
Toast.makeText(MainActivity.this, "bmFrame == null!",
Toast.LENGTH_LONG).show();
} else {
AlertDialog.Builder myCaptureDialog = new AlertDialog.Builder(
MainActivity.this);
ImageView capturedImageView = new ImageView(
MainActivity.this);
capturedImageView.setImageBitmap(bmFrame);
LayoutParams capturedImageViewLayoutParams = new LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
capturedImageView
.setLayoutParams(capturedImageViewLayoutParams);
myCaptureDialog.setView(capturedImageView);
myCaptureDialog.show();
}
}
});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
MediaPlayer.OnCompletionListener myVideoViewCompletionListener = new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
Toast.makeText(MainActivity.this, "End of Video", Toast.LENGTH_LONG)
.show();
}
};
MediaPlayer.OnPreparedListener MyVideoViewPreparedListener = new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
long duration = myVideoView.getDuration(); // in millisecond
Toast.makeText(MainActivity.this,
"Duration: " + duration + " (ms)", Toast.LENGTH_LONG)
.show();
}
};
MediaPlayer.OnErrorListener myVideoViewErrorListener = new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Toast.makeText(MainActivity.this, "Error!!!", Toast.LENGTH_LONG)
.show();
return true;
}
};
}
跟踪：
E/AndroidRuntime( 4317): FATAL EXCEPTION: main
E/AndroidRuntime( 4317): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.captureframe/com.example.captureframe.MainActivity}: java.lang.IllegalArgumentException
E/AndroidRuntime( 4317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
E/AndroidRuntime( 4317): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
E/AndroidRuntime( 4317): at android.app.ActivityThread.access$600(ActivityThread.java:141)
E/AndroidRuntime( 4317): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
E/AndroidRuntime( 4317): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 4317): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 4317): at android.app.ActivityThread.main(ActivityThread.java:5103)
E/AndroidRuntime( 4317): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 4317): at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime( 4317): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
E/AndroidRuntime( 4317): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 4317): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 4317): Caused by: java.lang.IllegalArgumentException
E/AndroidRuntime( 4317): at android.media.MediaMetadataRetriever.setDataSource(MediaMetadataRetriever.java:165)
E/AndroidRuntime( 4317): at com.example.captureframe.MainActivity.onCreate(MainActivity.java:46)
E/AndroidRuntime( 4317): at android.app.Activity.performCreate(Activity.java:5133)
E/AndroidRuntime( 4317): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
E/AndroidRuntime( 4317): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
任何想法将不胜感激。
最佳答案
使用此方法。
public static Bitmap retriveVideoFrameFromVideo(String videoPath)
throws Throwable
{
Bitmap bitmap = null;
MediaMetadataRetriever mediaMetadataRetriever = null;
try
{
mediaMetadataRetriever = new MediaMetadataRetriever();
if (Build.VERSION.SDK_INT >= 14)
mediaMetadataRetriever.setDataSource(videoPath, new HashMap<String, String>());
else
mediaMetadataRetriever.setDataSource(videoPath);
// mediaMetadataRetriever.setDataSource(videoPath);
bitmap = mediaMetadataRetriever.getFrameAtTime();
}
catch (Exception e)
{
e.printStackTrace();
throw new Throwable(
"Exception in retriveVideoFrameFromVideo(String videoPath)"
+ e.getMessage());
}
finally
{
if (mediaMetadataRetriever != null)
{
mediaMetadataRetriever.release();
}
}
return bitmap;
}