Gstreamer0.10-ffmpeg shows dependencies problems and it cannot be installed. I have this problem with some apps while others have been installed easily. After failing to install directly I use terminal to install them by the two ways: dpkg -i and apt-get but all result in failure.
Edit: It seems that it was installed (didn't show errors during installation) but nothing changed with audio convert. How could I check if ffmpeg is installed or not?