ffmepg入门学习三 java通过摄像头截取图片

1.准备

      有可连接的摄像头，例如大华、海康

   ffmpeg下载：https://blog.csdn.net/qq_16855077/article/details/89839708

   例如下面rtsp各个品牌的url不同，这里就不过多的说明

   rtsp://admin:[email protected]:554/Streaming/Channels/101?transportmode=unicast

 2.截图

  
  
package com.qihui.qxj.services.system;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.junit.Test;

public class Test1 {
@ Test
public void test1( ) {
List commend = new ArrayList();
commend. add( "c:/bin/ffmpeg.exe");
commend. add( "-i");
commend. add( "rtsp://admin:[email protected]:554/Streaming/Channels/101?transportmode=unicast");
commend. add( "-s");
commend. add( "4096*1800");
commend. add( "-b");
commend. add( "4M");
commend. add( "-y");
commend. add( "-f");
commend. add( "image2");
commend. add( "-an");
commend. add( "-loglevel");
commend. add( "8");

commend. add( "d:/project/direct/40/a1.jpg");
Process p = null;
try {
ProcessBuilder builder = new ProcessBuilder(commend);
builder.command(commend);
p = builder.start();
p.getOutputStream().close();
doWaitFor(p);
p.destroy();
System. out.println( 1122);
} catch (Exception e) {
PrintCatchErrorMsg.Print(e, "Part", "getRSTPPicture.catch", "Exception");
p.destroy();
}
}


public static int doWaitFor(Process p) {
InputStream in = null;
InputStream err = null;
int exitValue = -1;

try {
in = p.getInputStream();
err = p.getErrorStream();
boolean finished = false;

while(!finished) {
try {
Character c;
while( in.available() > 0) {
c = new Character(( char) in.read());
System. out.print(c);
}

while(err.available() > 0) {
c = new Character(( char)err.read());
System. out.print(c);
}

exitValue = p.exitValue();
finished = true;
} catch (IllegalThreadStateException var19) {
Thread.currentThread();
Thread.sleep( 500L);
}
}
} catch (Exception var20) {
} finally {
try {
if ( in != null) {
in.close();
}
} catch (IOException var18) {
}

if (err != null) {
try {
err.close();
} catch (IOException var17) {
}
}

}

return exitValue;
}
}
  
  

 c:/bin/ffmpeg.exe  ffmepeg的位置

 -i  地址

-s  分辨率

-b 码率

-y 如果文件存在，再替换

注意：如果内网环境可以截图，外网环境截图失败，需要把协议转为tcp,增加两行代码

  
  
commend. add( "-rtsp_transport");
commend. add( "tcp");
  
  

转载自：https://blog.csdn.net/qq_16855077/article/details/90207118

1.准备