Task: Question Answering
Input (English): Context: MPEG-4 Part 14 is an instance of the more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon the QuickTime File Format. 
 Question: Which is the basis of MPEG-4 Part 14?
Output (English): iso base media file format