Help Needed - Multiple Camera feeds with one audio source

[Coach Keene]

Hello,
I am brand new to OBS and the systems. We are trying to stream our local athletics on both Youtube and Facebook Live at the same time. We have downloaded the multiple RTMP platform. We have a Hudl camera that send the live feed to a YouTube account, and we also have a high schooler that does play by play on his Facebook live page. We are wanting to take the audio he is using for his play-by play on Facebook live and stream it with the video that is being used with Hudl to our Youtube account. So essentially it would be 2 live feeds happened (2 seperate camera - 1 iphone for Facebook Live, & the Hudl Focus camera for our Youtube stream) and still use the same audio or play by play for both streams simultaneously. Is this even possible? Thank you so much for any help you can provide.

 

[Lawrence_SoCal]

As you posted to Windows forum, I'll assume you have a powerful enough PC for real-time video encoding
Be careful with streaming to 2 platforms at once, as that may involve encode 2 different video streams (so 2X the already demanding work). And then there are the bandwidth implications per stream

With that said, with OBS, which is a compositing tool, what would make sense to me is to have student be on the OBS PC and provide the audio input there. Does the student really want this event to be on their Facebook page? [hopefully not, but if yes]
- have the student (in a booth?) with the OBS PC and use a mic [ then their FB live from iPhone mic, and separate mic to OBS PC]
Without knowing more, I'd think
- Hudl cam into OBS PC, as well as a microphone (a good quality wired 3.5mm or USB mic is relatively cheap, under $100, and a gaming student may already have one)
- Use OBS on that PC and send same audio and video to both FB and YT at same time [if really insist on sending to both platforms.. more below]

Food for thought
- having comments on 2 platforms precludes common discussion. *IF* you use Scheduled Facebook Live events, you get a URL that allows non-Facebook users (no need to log in) to see video and see FB comments

- downside is logged in YouTube users can't comment if not authenticated FB users; further, unless part of FB level up program, videos currently limited to 720p, vs higher resolution on YouTube.​

- If the higher resolution video of YT is desired (and you have PC power, bandwidth, etc to support it), then having higher school do play-by-play on OBS PC going to just YouTube?

I get streaming to multi service, but so often it makes little sense to me, especially when you can stream to a platform like YouTube that doesn't require a user account and anyone can get do (and easy access on Roku or other smart TV type devices). I stream to Facebook as user community was too small for schedule live events from a mobile device (YT used to require 100 subscribers, if I recall correctly). Now that I'm using OBS, I could now stream to YouTube, but why? my viewers don't really care if 720p instead of 1080p, and I expect Facebook to upgrade to 1080p in general (not current limited pilot group) soon enough (maybe 2021 year- end or next year??? but just guessing). For a sense of community, I recommend picking one platform, and using it

Now, could you grab audio from FB live stream and use in OBS to send to YouTube... yes, but you wouldn't want to, due to normal stream lag (easily 30 seconds, possibly more... depends, and varies) hence much better to grab audio directly rather than delayed stream. If your decision ends up being OBS stream to only YouTube, there are other options to send audio direct from iPhone into OBS with less lag than waiting to grab audio from FB video stream