Java: executing ffmpeg with command line arguments

I'm trying to execute ffmpeg with several command line arguments. See http://pastebin.com/6RzLL8KQ for the complete program. It takes arguments and will print the correct command, but it will not execute ffmpeg with the correct parameters. However if I test and put String commandStr[] = {ffmpegpath,"-h"}; it is able to print that without issue. If I run the command on /home/user/PB200014b.avi for example, it prints the command ffmpeg -i /home/user/PB200014b.avi -r 1 -f image2 /home/user/originalframes-PB200014b/%03d.jpg as it should, but no frames a开发者_高级运维ppear in the directory /home/user/originalframes-PB200014b/

The relevant lines of my code are lines 71 onward. Thank you for any help you may be able to give!

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Your program works fine on my computer. Have you checked error stream of created process in your example?

ffmpeg.getErrorStream();

May be some errors of ffmpeg itself?