Customize CSV file containing [VIDEO_PATH CLASS_INDEX] to [VIDEO_PATH START_FRAME END_FRAME CLASS_INDEX]

A csv file will be provided containing data in following structure [VIDEO_PATH CLASS_INDEX], it must be converted to [VIDEO_PATH START_FRAME END_FRAME CLASS_INDEX] by adding [START_FRAME END_FRAME] which are numerical number obtained from the number of images (frames) found for each sub folder video within a group of video classes.