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• Qt6.4.1 QProcess cannot call external program FFmpeg [closed]

  21 décembre 2022, par Xingchen

  Based on the official Qt example, slightly modified to call the external ffmpeg.exe for transcoding operations

  


  QProcess *p = new QProcess(this);
QString program = "C:\\Users\\kyrio\\Documents\\Qt_Project\\build-test-Desktop_Qt_6_4_1_MinGW_64_bit-Debug\\debug";
QStringList arguments;
arguments << "ffmpeg" << "-i" << "C:\\Users\\kyrio\\Videos\\222.mp4" << "C:\\Users\\kyrio\\Videos\\223.mov";
p->start(program, arguments);


  


  Run no results, try a variety of writing methods also no results, get the output is empty, and no FFmpeg-related processes under the task manager
  
Try to call cmd, task manager can see the sub-processes under the new cmd.exe
  
command is fine, can be called in the terminal, but need to add ./or.
  
can be successfully run in the terminal

  


  Try prefixing arguments with.\or.\or./, still no response
  
Tried to get the exact path to the ffmpeg.exe file in the program string, still no response
  
I want to be able to successfully call ffmpeg.exe to achieve the video transcoding needs

  


  I have made the "program" exact to ffmpeg.exe and this is still unresponsive.No process, no errorString output.The output of exitCode is also absent.

  


  QString program = "C:\\Users\\kyrio\\Documents\\Qt_Project\\build-test-Desktop_Qt_6_4_1_MinGW_64_bit-Debug\\debug\\ffmpeg.exe";


  


  Running results

  


  I tried to start cmd and connected the errorOccurred signal, but there is no output, it is worth noting that the process cmd appears in the task manager
  
no output
task manager

  


• I want to convert relay server nodejs http->websocket code version to java netty to spring-websocket

  20 août 2019, par rura6502

  I want to rewrite this example(https://github.com/phoboslab/jsmpeg/blob/master/websocket-relay.js) to java using netty and spring-WebSocket.

  This nodejs example’s HTTP server get the media data from FFmpeg and relay to the WebSocket. And then javascript library draws on the HTML Canvas.

  But My problem is that when I use netty, spring-WebSocket, some data cannot read by the javascript library and there are many data loss.

  In the example, this nodejs code’s main part I think.

  http = require('http'),
  
  WebSocket = require('ws');
  
  // setting websocket server ..............
  
  var streamServer = http.createServer( function(request, response) {
  
    // ....................
  
      response.connection.setTimeout(0);
  
      request.on('data', function(data){
  
          socketServer.broadcast(data);
  
              // .....
  
      });
  
    // .................
  
  }).listen(STREAM_PORT);

  So I already tried to change this. I just used netty code in the official document(https://netty.io/wiki/user-guide-for-4.x.html) and changed sending a part for the Websocket

  // this code is in channelRead method
  
  ByteBuf buf = (ByteBuf) msg;
  
  try {
  
    while (buf.isReadable()) { // (1)
  
      byte[] bytes = new byte[buf.readableBytes()];
  
      buf.readBytes(bytes);
  
      WSHandler.wsSessions.stream().forEach(wsSession -> {
  
        try {
  
          wsSession.sendMessage(new BinaryMessage(bytes));
  
        } catch (IOException e) {
  
          e.printStackTrace();
  
        };  
  
      });
  
    }
  
  } finally {
  
    ReferenceCountUtil.release(msg); // (2)
  
  }

  Please tell me what I missed. help me. thanks.

• FFmpeg -filter_complex_script crop & blurbox with time based values

  6 juin 2021, par user1503606

  I am trying to create a script that will move a blur boxed across a video based on x and y cords in a text script.

  


  I can easily create a blur box with the following ffmpeg command.

  


  ffmpeg -y -i pex.mp4 -filter_complex_script cropblur.txt -map "[v]" out_crop.mp4


  


  The cropblur.txt has the following.

  


  [0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,5)'[v]


  


  This creates this.

  


  

  


  What I want is the blur box to move across where the lady is running.

  


  

  


  She obviously runs out from where the box is positioned.

  


  I can create a script where I can track the correct x and y positions for the blox using jquery ui or something I just dont understand how to implement this in a filter_complex_script.

  


  I thought it would be a simple as just appending to the script something like this.

  


  [0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,2)'[v]
[0:v]crop=200:200:200:360,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,2\,3)'[v]
[0:v]crop=200:200:200:370,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,3\,4)'[v]
[0:v]crop=200:200:200:380,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,4\,5)'[v]


  


  Changing the time and the x position based on the incremented time.

  


  If I run this script I get this error.

  


  No output pad can be associated to link label '0:v'


  


  Obviously I am doing something wrong but I cannot find any documentation that really helps me understand how to do this https://ffmpeg.org/ffmpeg.html the official docs dont really help.

  


  I could do it by running multiple passes like this.

  


  ffmpeg -y -i pex.mp4 -filter_complex "[0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,2)'[v]" -map "[v]" out_crop.mp4 && ffmpeg -y -i out_crop.mp4 -filter_complex "[0:v]crop=200:200:200:360,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,2\,3)'[v]" -map "[v]" out_crop2.mp4


  


  I Would just really like to understand how to use the filter complex scripts in this way ?

  


  Any help would be great.

  


  Thanks