我想使用 xuggler 从视频中创建图像。提供的示例代码以一定间隔从视频中生成图像,我对其进行了修改,使其仅从视频中生成一个图像。但是,看起来它实际上是在循环播放整个视频,而不仅仅是拍摄特定时间的快照然后结束。
如何在不循环播放整个视频的情况下从视频中正确生成一张图像?在较短的视频上这很好,但在 hr+ 视频上,这将成为一个大问题。
下面是我的代码:
import javax.imageio.ImageIO;
import java.io.File;
import java.awt.image.BufferedImage;
import java.util.Random;
import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.MediaListenerAdapter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.event.IVideoPictureEvent;
import com.xuggle.xuggler.Global;
public class Test extends MediaListenerAdapter {
public static final double SECONDS_BETWEEN_FRAMES = 1;
public static final long MICRO_SECONDS_BETWEEN_FRAMES = (long)(Global.DEFAULT_PTS_PER_SECOND * SECONDS_BETWEEN_FRAMES);
private int mVideoStreamIndex = -1;
boolean takeImage = true;
public static void main(String[] args) {
new Test("src/main/Wildlife_ 512kb, hkf.mp4");
}
public Test(String filename) {
System.out.println("starting the xuggler");
IMediaReader reader = ToolFactory.makeReader(filename);
reader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);
reader.addListener(this);
while (reader.readPacket() == null) { do { } while(false); }
}
public void onVideoPicture(IVideoPictureEvent event) {
try {
if (event.getStreamIndex() != mVideoStreamIndex) {
if (-1 == mVideoStreamIndex) {
mVideoStreamIndex = event.getStreamIndex();
} else {
return;
}
}
if (event.getTimeStamp() > MICRO_SECONDS_BETWEEN_FRAMES && takeImage) {
Random random = new Random();
File file = new File("/Users/yao/__TEMP__/media_upload_temp/" + random.nextInt(Integer.MAX_VALUE) + ".png");
ImageIO.write(event.getImage(), "png", file);
double seconds = ((double)event.getTimeStamp()) / Global.DEFAULT_PTS_PER_SECOND;
System.out.printf("at elapsed time of %6.3f seconds wrote: %s\n", seconds, file);
takeImage = false;
}
} catch (Exception e) { e.printStackTrace(); }
}
}