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• The correct way to use FFMPEG in JAVA

  4 octobre 2018, par Fred

  I have not been able to find lots of information of how to use FFMPEG commands in my JAVA code.

  I understand how to execute FFMPEG commands through the terminal, however if I want to use FFMPEG commands in my JAVA code how should I go about it ?

  I saw an example of using Java.lang.Runtime class. But if I do it this way, would that not require the computer using my JAVA application to have FFMPEG installed on their computer ?

  In short I want to be able to create a JAVA program that has FFMPEG methods available without having the need to have FFMPEG installed.
  Is this possible ?

• ffmpeg fails with : Unable to find a suitable output format for 'pipe :'

  5 novembre 2016, par user3542055

  I am trying to record my desktop and save it as videos but ffmpeg fails.

  Here is the terminal output :

  $ ffmpeg -f alsa -i pulse -r 30 -s 1366x768 -f x11grab -i :0.0 -vcodec libx264 - preset ultrafast -crf 0 -y screencast.mp4
  
  ...
  
  Unable to find a suitable output format for 'pipe:'

• 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