Restream to Twitch with a separate VOD audio channel

[erickskrauch]

I'm sorry that I had to broke your issue template, it was in Chinese.

I'm trying to achieve a somewhat strange idea: I want to stream on Twitch and YouTube, but in such a way that on Twitch the broadcast will use their feature of a separate track for VOD ( to exclude music) and on YouTube with that particular track without music.

I have already tricked OBS by specifying the server I was not using as the platform to broadcast to:

Then in the hosts file I override the address for this server, directing it to localhost:

Now I'm ready to receive the incoming stream and process it in my way. But the problem is that I can't catch the second track in any way. No matter which side I go to, I always get only 1 track. The second track is nowhere to be found. I suspect that for some reason the SRS implementation itself cuts off everything but the first track.

I checked: if I'll remove the redirection to localhost and start streaming directly on Twitch, the separate VOD track works fine. OBS has no way of knowing which end server it's streaming to, so the rtmp server gets the same content and the problem is somewhere on its side.

Is there anything I can do about it?

[winlinvip]

I didn't get you, what's the deploy arch? Use OBS to publish to SRS or to Twitch? Or publish to SRS to forward to twitch? What's your use scenario? Please don't only tell us a feature to implements.

[erickskrauch]

Sorry to confuse you. I'm trying to stream into multiple platforms, so I need to stream to the SRS server, which then will publish a stream to the target platforms. The trick with "broadcast to twitch" from the OBS is only necessary to activate the "Twitch VOD Track" feature, but actually, the stream is going to the SRS server.

[winlinvip]

OK, I got you. You publish stream to SRS by OBS, then use SRS to forward to multiple platforms.

Is it possible to publish to Twitch by normal RTMP stream? Like you select the Custom RTMP server of OBS?

[erickskrauch]

Yes, it is possible, but then I can't specify a separate audio track for VOD in the video settings tab. This is a nuance of the OBS implementation: it only shows this option if it thinks the stream is going to be published on Twitch. That's why I need this hack with redefining the server address through the hosts file.

In any case, this hack works correctly and the stream comes to the SRS server. The problem is that there is no way I can get to the second track on the SRS side.

[erickskrauch]

@winlinvip, sorry for pinging. Do you have any ideas about this?

[winlinvip]

Yes, I think we should make it better to forward to streaming platform, like twitch etc.

I mark this issue to feature, and we may check it in SRS 5.0, thanks.

[krakow10]

I am interested in the same use case.
OBS -> SRS (audio track 1 with music, audio track 2 with no music)
SRS -> Youtube (no music)
SRS -> Twitch (with music for live, no music for VOD track)

I think streaming to SRS using SRT might make more sense than trying to accept the specialized Twitch VOD RTMP from OBS which is limited to 2 audio tracks. This way, only the specialized Twitch VOD RTMP output with 2 audio tracks has to be implemented.

OBS has a pull request to be able to stream SRT with multiple audio tracks, with build artifacts also available.

This is also possible by using the OBS ffmpeg custom output but it is not nearly as stable.

[erickskrauch]

I got a notification about converting the original issue into a discussion. I just wanted to say, that I'm still there and would be glad to have that feature 😊

[winlinvip]

@krakow10 mentioned a solution above, which can push SRT through OBS, thus enabling multi-track audio. Have you tried this solution?

RTMP is not quite suitable for multi-stream support, as it involves many customization and adaptation issues. If SRT can solve this problem, it might be the best solution.

Although RTMP defines multi-stream in its protocol, the vast majority of systems are single-stream, while SRT is based on TS stream, so it naturally supports multiple tracks.

TRANS_BY_GPT4

[winlinvip]

Feel free to contact us on Discord, I am somewhat interested in this OBS multi-track scenario, but I tend to prefer not using RTMP to solve this problem, we can discuss more clearly on Discord. https://discord.gg/yZ4BnPmHAd'

TRANS_BY_GPT4

[erickskrauch]

So the problem is still in the room: OBS can directly stream to Twitch with its feature for a separate audio track for VOD. And there is no other software that can do the same. Sure I can stream from OBS with SRT protocol. But then I need to remux stream in a way that Twitch will understand as 2 audio tracks, one for live and one for VOD.

[winlinvip]

If OBS can use SRT to push multiple audio tracks, then the solution given by @krakow10 above is feasible, and it can transfer different streams to different platforms such as Twitch and YouTube.

TRANS_BY_GPT4

[erickskrauch]

But SRS doesn't have a feature to push separate VOD track via RTMP protocol. It seems that there is no software besides OBS which is capable of it. You must implement that Twitch RTMP extension on SRS side first and then yes we will become able to push 2 audio tracks via SRT and remux them to extended RTMP stream for Twitch on SRS side.

[ItWasEnder]

I'm actually really interest in this since I made an RTMP service that allows me to restream to multiple platforms using docker and NGINX-RTMP. The only feature I would like it to be able to implement a vod track.

Repo: https://github.com/EnderGamingFilms/Open-Simulcast