MPEG_1_only_flag [MPEG-2 Semantics]
MPEG_1_only_flag is a 1-bit field in an MPEG-2 video stream descriptor This is a 1 bit field which when set to '1' indicates that the video stream contains only ISO/IEC 11172-2 data. If set to '0' the video stream may contain both ISO/IEC 13818-2 video data and constrained parameter ISO/IEC 11172-2 video data.
Ref: 13818-1, Table 2-41, Section 2.6.3
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