Metadata support in NGINX RTMP

Today I’ve added sending metadata to subscribers. In majority of cases that does not make big difference. However sometimes picture dimensions (displayWidth & displayHeight) are different from actual width & height. In this case missing metadata make video displayed with the wrong dimensions.

Here’s what ffplay outputs now:

Metadata:
Server : NGINX RTMP (github.com/arut/nginx-rtmp-module)
displayWidth : 592
displayHeight : 256
fps : 23

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