Program stream (PS or MPEG-PS) is a container format for multiplexingdigital audio, video and more. The PS format is specified in MPEG-1 Part 1 (ISO/IEC 11172-1) and MPEG-2 Part 1, Systems (ISO/IEC standard 13818-1[9]/ITU-T H.222.0[6][7]). The MPEG-2 Program Stream is analogous and similar to ISO/IEC 11172 Systems layer and it is forward compatible.[10][11]
Program streams are used on DVD-Video discs and HD DVD video discs, but with some restrictions and extensions.[12][13] The filename extensions are VOB and EVO respectively.
^MPEG-2 Encoding Family (Full draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. 14 February 2012. Retrieved 13 December 2021. Licenses pertain to tools and not to streams or files per se.