我试图使用调用ffmpeg的JAVE将* .mov文件转码为* .mp4文件.
输入文件和输出文件都是InputStream和OutputStream形式.
这意味着我需要将InputStream和OutputStream作为-f和-y parematers传递给ffmpeg.
我怎么做 ？

    //Read a movfile.mov converted into a FileInputStream  
    InputStream fileInputStream = getFileInputStream();  
    OutputStream fileOutputStream = new FileOutputStrea(outputMP4File) //Output        
    Process p = Runtime.exec("ffmpeg -i - -y -");  
    InputStream pInStrm = p.getInputStream();  
    OutputStream pOutStrm = p.getOutputStream();  
    int vin = 0,vout = 0;   

    Thread read = new Thread() {  
         byte[] buff = new byte[4096];  
          void run() {   
            while ((vin=fileInputStream.read(buf))!=-1) {   
                 pOutStrm.write(buf,vin);   
            }   
         }   
      }; read.start();

    Thread write = new Thread() {  
        byte[] buff = new byte[4096];  
        void run() {  
             while ((vout=pInStrm.read(buf))!=-1) {  
                 fileOutputStream.write(buf,vout);  
            }  
         }  
      }; write.start();  

但我一直收到“IOException：管道已关闭”错误.有人可以帮帮我吗？
或者,如果有任何JAVA API可以执行此转码(在Windows和RedHat Linux上),那将非常有帮助

谢谢