[Solved]Arguments formatting when calling ffmpeg from QProcess

musimbate

Hi,
I am trying to call a command line program (ffmpeg) from my Widgets Qt application.The program is starting but the arguments are not being passed correctly(The window is disappearing before I can see what is going wrong).
The command I want pass is:

ffmpeg.exe -i video1.avi video.wmv

(All is working fine when I call it myself from the command line).
Can anyone suggest a way I can get my arguments interpreted correctly by Qt?The relevant code to the question is shown below.

Thank you for your time.

@
QString program1="ffmpeg.exe";

  QStringList arguments;
  arguments << "-i"<< "video.avi" << "video.wmv";

  QProcess *myProcess = new QProcess(this);
  if(myProcess->startDetached(program1,arguments))
      ui->pushButton->setText("YOUR PROGRAM STARTED.");//for debugging purposes.

@

SGaist

Hi,

It should be something like:

@
arguments << "-i" << "video1.avi" << "video.wmv";
@

However relative path to the video files might be a bad idea

musimbate

Thank you ,
I resolved to using full paths:
@
QString program1="D:\ffmpeg\bin\ffmpeg.exe";

  arguments << "-i"<< "D:\\ffmpeg\\bin\\ohm.avi" <<"-r"<<"24" <<"D:\\ffmpeg\\bin\\output.flv";

@

and it is working fine now.

SGaist

You're welcome !

Depending on how you intend to use your program you might better offer a configuration option to set the path to ffmpeg rather than hardcode it.

Since it's working now, don't forget to update the thread title prepending [solved] so other forum users may know a solution has been found :)