Additional independent substreams may be used for secondary audio programs such as foreign language soundtracks, commentary, or descriptions/voiceovers for the visually impaired. Metadata in the substream describes the purpose of each included channel.Īll DD+ streams must contain at least one independent substream or legacy substream, which contains the first (or only) 5.1 channels of the primary audio program. As dependent substreams have the same structure as independent substreams, each dependent substream may contain up to five full-bandwidth channels and one low-frequency channel however these channels may be assigned to different speaker placements. Dependent substreams, which contain additional channels beyond the traditional 5.1 channels.At most a single legacy substream may be present in a DD+ stream. Legacy substreams, which contain a single 5.1 program, and which correspond directly to Dolby Digital content.The channels present in an independent substream are limited to the traditional 5.1 channels: Left (L), Right (R), Center (C), Left Surround (Ls), and Right Surround (Rs) channels, as well as a Low Frequency Effects (Lfe) channel. ![]() #Ddp audio file plus#Up to eight dependent substreams may be present in a Dolby Digital Plus stream.
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