[solved] TProcess: Parameters.Add leads to empty Commandline

[Ocye]

Nothing happens when I use the following code. The legacy method works well. Did I miss something?

Code: [Select]

  with TProcess.Create(nil) do
  try
//    CommandLine:='ffmpeg -r 2 -i /tmp/img%d.png -r 25 test.mpg'; //works
    Executable:='/usr/bin/ffmpeg'; //ffmpek > "executable not found"
    Parameters.Add('-r 2');
    Parameters.Add('-i '+GetTempDir+'img%d.png');
    Parameters.Add('-r 25');
    Parameters.Add('test.mpg');
    ShowMessage(CommandLine);  //empty
    Execute;
  finally
    Free; //TProcess
  end; //no output, no error


[taazz]

well commandline is a one way road it gives params and executable to TProcess but it does not reconstruct it self from the existing params you would have known that if you simple took a fast look on the class your self.

[Ocye]

Thank you for reply. But actually my question is why Parameters.Add() don't work. I have no clue what happens (nothing) and expected a Commandline generated from Paramaters (of course, it's not imperative). But there is nothing. So what's wrong with the code snippet?

[marcov]

    Parameters.Add('-r 2');
    Parameters.Add('-i '+GetTempDir+'img%d.png');
    Parameters.Add('-r 25');

These are wrong, use one .add add for each item   add('-r')  and add('2'); etc.
 

[Ocye]

These are wrong, use one .add add for each item   add('-r')  and add('2'); etc.

I thought a parameter consists of switch plus value, but apparently there is no whitespace allowed. Now it works. Thanks a lot!