# Determine the SDPs to create
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Determine the number of SDPs you will create in Elemental Live. Here are the rules:
+ The input must include one and only one video SDP.
+ Plan to create one SDP for each audio stream you want to extract. Following example 2 above, you must create three audio SDPs.
+ Plan to create one SDP for the captions ancillary stream (if any).
+ Plan to create one SDP for the SCTE-104 stream (if any).