> ## Documentation Index
> Fetch the complete documentation index at: https://docs.up.telestream.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Metadata

> What was detected in a source's stream once it arrived.

A source's `stream_metadata` is what the engine actually found in the stream, as opposed to the expected properties, which are what you said to expect. It is read-only, and absent until a stream has arrived.


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