WEBMARIZER: Automatically 'summarizes' a video by creating multiple WEBMs or GIFs from a single video. It breaks a video into pieces and generates a WEBM/GIF from each piece. It can do this for each video in your folder with a single click. This is similar to a video thumbnails sheet but in WEBM/GIF form.
def generateOuput_filename
modified GUI include default values for 'output_to_subdir' 'output_dir_name' added new params and get functions to match existing code.
TODO: Add UI elements to control new GUI elements (new params)