Hi All, I am doing this : mp4tool -extract file.mp4 4 video & i get this error message Exception in thread "main" java.lang.NoClassDefFoundError: Enst/mp4tool I have mp4tool.jar in my directory as well. Any clues? Basically, I am trying to get a bitstream file (.cmp) from a mpeg4 (.mp4) file. Regards, HARISH V