使用QT中的QProcess启动gst-launch 没有响应

zbwyy

我是linux3.05的内核，用的qt4.8.5版本，在使用QProcess启动gst-launch程序时始终没有响应，没有任何输出，就像是跳过了这一步，有没有哪位大神知道原因

1. QString strMsg;
   
2.     QString strGStreamer("gst-launch");
   
3.     char*   pstrMsg;
   
4.     QStringList strListArg4GStreamer;
   
5. 
   
6.     //strListArg4GStreamer <<"-ve";
   
7.     strListArg4GStreamer <<"v4l2src device=/dev/video2";
   
8.     //strListArg4GStreamer <<"device=/dev/video2";
   
9.     strListArg4GStreamer <<"!";
   
10.     strListArg4GStreamer <<"'video/x-raw-yuv, format=(fourcc)UYVY'";
    
11.     strListArg4GStreamer <<"!";
    
12.     strListArg4GStreamer <<"mfw_isink";
    
13.     strListArg4GStreamer <<"disp-width=1000";
    
14.     strListArg4GStreamer <<"disp-height=800";
    
15.     strListArg4GStreamer <<"axis-left=16";
    
16.     //strListArg4GStreamer <<QString::number((ui->LIVE->winId()));
    
17.     //strListArg4GStreamer <<"--help";
    
18. 
    
19.     strMsg = strGStreamer+" ";
    
20.     strMsg += strListArg4GStreamer.join(" ");               // std output
    
21.     strMsg = "INFO: GStreamer argument:"+strMsg+"\n";
    
22.     QByteArray ba=strMsg.toLatin1();
    
23.     pstrMsg=ba.data();
    
24.     printf(pstrMsg);
    
25. 
    
26.     //m_qMplayerProcess = new QProcess(ui->LIVE);
    
27.     if(NULL == m_qMplayerProcess){
    
28.         printf("Err: QProcess error\n");
    
29.     }
    
30.     m_qMplayerProcess = new QProcess(ui->LIVE);
    
31.     //m_qMplayerProcess->setProcessChannelMode(QProcess::MergedChannels);
    
32.     m_qMplayerProcess->start(strGStreamer,strListArg4GStreamer);

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