High Quality Content by WIKIPEDIA articles! MPEG-4 Part 17, or MPEG-4 Timed Text, or MPEG-4 Streaming text format is the text based subtitle format for MPEG-4, published as ISO/IEC 14496-17 in 2006. It was developed in response to the need for a generic method for coding of text as one of the multimedia components within audiovisual presentations.