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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

  


• Combining audio (.mp4) file and video (.webm) file to a new (.mp4) file using python [closed]

  3 mai 2020, par D. Damyanov

  How can I merge .webm video file and a .mp4 audio file to a new .mp4 audio/video file using python ? I tried to use the ffmpeg package for PyCharm but I am having troubles with finding the right documentation. On the official site https://ffmpeg.org/ I`ve found only instructions for usage in the terminal or cmd.

  


• Play the last minute of an mp3 file in Linux [closed]

  29 mai 2021, par Jörg

  I have got a number of audiobooks with play times beyond 30h. I noticed that a handful are corrupted towards the end. I have been trying to find ways to play only the last couple of minutes. ffplay -ss <seconds></seconds> doesn't seem to be able to do it since the files are too big.

  


  I'm able to jump ahead to position 50000 but any higher value, such as 98000, and that ffplay gets stuck.

  


  ffplay -ss 50000  bigfoo.mp3

  


  Does anyone know a fix or an terminal based alternative ? I also had a look into Python but didn't find any relevant packages that can start playing in the middle of an audio file.