mencoder转换的flv不能用flvplayer播放

 

用mencoder转换成.flv后用一般的播放器是可以播放的, 可是使用flvplayer无法播放...

问题方向比较明确.是命令的问题...

正确的转换命令如下, 测试--可以用flvplayer播放.

 

   /**
    * 使用mencoder转码
    * @param videoPath 源路径 -- 要转换的视频文件
    * @param targetPath 目标路径 -- 转换后的视频flv
    * @return 返回目标路径
    */
   public    String mencoderTransVideo() {
    
    List commend = new java.util.ArrayList();
    commend.add( "d:\\flv\\MediaCoder\\codecs\\mencoder.exe");    
    commend.add(videoPath);
    
    commend.add( "-of");
    commend.add( "lavf");
    commend.add( "-oac");
    commend.add( "mp3lame");
    commend.add( "-lameopts");
    commend.add( "abr:br=56");
    commend.add( "-ovc");
    commend.add( "lavc");
    commend.add( "-lavcopts");
    commend.add( "vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:dia=4:cmp=6:vb_strategy=1");
    commend.add( "-vf");
    commend.add( "scale=512:-3");
    commend.add( "-ofps");
    commend.add( "12");
    commend.add( "-srate");
    commend.add( "22050");
    
    commend.add( "-o");
    commend.add(ChineseSpelling.getInstance().getSelling(targetPath));

     try {
      ProcessBuilder builder = new ProcessBuilder();
      builder.command(commend);
      Process process = builder.start();
       /**
        * 同时清空mencoder的错误流缓冲区和输出缓冲区(防止线程阻塞--停掉tomcat才能转码)
        */
       final InputStream is1 = process.getInputStream();
       new Thread( new Runnable() {
             public void run() {
                     BufferedReader br = new BufferedReader( new InputStreamReader(is1));    
             try {
               while(br.readLine() != null) ;
            } catch (IOException e) {
              e.printStackTrace();
            }
             }
      }).start(); // 启动单独的线程来清空process.getInputStream()的缓冲区
      InputStream is2 = process.getErrorStream();
      BufferedReader br2 = new BufferedReader( new InputStreamReader(is2));    
      StringBuilder buf = new StringBuilder(); // 保存输出结果流
      String line = null;
       while((line = br2.readLine()) != null) buf.append(line);    
       return targetPath;
    } catch (Exception e) {
      e.printStackTrace();
       return null;
    }
  }