As @Amara Graham said, yes, Wowza will convert your WebRTC stream to RTMP if you need to use OBS.
Wowza Streaming Engine can ingest source WebRTC audio and video content and deliver it to supporting players. It can also transmux or transcode WebRTC to other streaming protocols, including HLS, HDS, RTMP, RTSP, and Microsoft Smooth Streaming
https://www.wowza.com/docs/how-to-use-webrtc-with-wowza-streaming-engine
But, in your case, you will need to be able to create a websocket connection to get the stream from your app. Typically, we’d ingest WebRTC stream from a browser, not an app. So, this will take some extra work or you may want to look for:
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WebRTC SDK to build your app
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Find an app that allows video chat and see if it offers a way to send that directly to Wowza as RTMP or RTSP and we can play it back on social media as a stream target.
I suggest you attend the free Wowza WebRTC webinar tomorrow that will show live demos of all you can do with WebTC in various workflows. Our WebRTC engineers will be taking questions as well.
But, to try and share a real time video chat with WebRTC from your phone to social media is not an easy task without a WebRTC SDK and you may want to submit a support ticket to ask about it or post in our public Slack channel.