我正在使用getFrameAtTime()
类的MediaMetadataRetriever
方法来获取位于视频中特定时间的帧(mp4)。当视频分辨率低于480 x 270时,此功能正常。但如果我使用相同视频的高清版(1280 x 720)则会出错。有什么出路吗?
logcat的:
06-11 08:24:45.714:D / dalvikvm(511):GC_EXTERNAL_ALLOC释放41K,53%免费2550K / 5379K,外部1625K / 2137K,暂停120ms
06-11 08:24:46.974:E / MediaMetadataRetrieverJNI(511):getFrameAtTime:videoFrame是一个NULL指针
代码就是这样:
package com.asin.amit;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.media.MediaMetadataRetriever;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class AsinActivity extends Activity {
/** Called when the activity is first created. */
private MediaMetadataRetriever mediam;
private Bitmap bmp;
private int g;
private ImageView myImageView;
private TextView tv ;
@Override
public void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mediam = new MediaMetadataRetriever();
String str= "/sdcard/DCIM/wdc.mp4";
mediam.setDataSource(str);
} catch (Exception e) {
// handle any errors
Log.e("HelloWorld", "1", e); // log the error
// Also let the user know something went wrong
Toast.makeText(
getApplicationContext(),
e.getClass().getName() + " " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
try {
bmp=mediam.getFrameAtTime();
} catch (Exception e) {
// handle any errors
Log.e("HelloWorld", "2", e); // log the error
// Also let the user know something went wrong
Toast.makeText(
getApplicationContext(),
e.getClass().getName() + " " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分:0)
这是我的错。我正在使用从互联网上下载的视频。但如果您使用移动设备拍摄的视频,它将会有效。