TProcess ffmpeg freezes

[domasz]

I just want to save first frame from MP4 file as PNG. The same code works fine for other programs (like imagemagick) but for some reason ffmpeg freezes. When I run the command normally (from cmd) ffmpeg doesn't wait for enter or any other key, just exits.

Code: Pascal  [Select][+][-]

1.   Proc := TProcess.Create(nil);
2.   Proc.CommandLine := 'ffmpeg -i "input.mp4" -vframes 1 thumb.png';
3.  
4.   Proc.Options := [poWaitOnExit];
5. //  Proc.ShowWindow := swoHIDE;
6.   Proc.Execute;
7.   Proc.Free;  

[Hartmut]

try "ffmpeg" instead of "fmpeg" in line 2

[domasz]

Thanks, but that's not the problem.

[Hartmut]

Did you set the correct working dir?
Maybe you must specify the path to ffmpeg.
Which OS do you use?

[domasz]

All dirs are fine. Ffmpeg does launch just fine, it loads the correct file. It just doesn't quit on it's own.

OS: Windows 10.

[Hartmut]

That means, file "thumb.png" is correctly created and after that ffmpeg hangs?

If file "thumb.png" already exists, than it can be that ffmpeg asks if to overwrite it. This can be suppressed with parameter -y

[BildatBoffin]

In case you are piping you must consume stdout. Does not seem to be the case here tho.

[domasz]

Sorry guys. You are all right and the code does work. I had a problem somewhere (kinda) else.

Before I try to convert with ffmpeg I try with imagemagick. And imagemagick found ffmpeg.exe and tried to convert the file with ffmpeg and froze, for some reason. I renamed ffmpeg to ffmpeg2 and now it works nicely.