ST 429-12:2008由美国电气电子工程师学会 US-IEEE 发布于 2008-12-03,并于 2008-12-03 实施。
This document defines the [SMPTE 429-7] Composition Playlist asset type extensions required for inclusion of [SMPTE 428-10] Closed Captions and Closed Subtitles, as well as the asset type extension required of Open Captions created per [SMPTE 428-7].
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