Question / Help Using 2 different ethernet adapters (2 different ISP's)

[Aenymi]

Hello, I'm new on the forums.

Before I get to the question I'd like to say that I did try to search google, but since I have no idea what to actually search for I didn't find anything remotely helpful.

What I'm trying to achieve is that I have 2 different internet adapters on a single PC. 1 one them (coming from the router) I would use for everything (including gaming) and the other one for streaming (uploading video/audio) to twitch from my computer. Is there any way this is possible, cause it seems like it is, even tho I have no idea about something like that.

You might wonder, why I would like to do this in the first place. Well the reason is quite simple... My main internet kinda sucks and there is no possible way to get any better where I'm living at the moment, so my 3G internet on iPhone actually has a better upload speed which is enough for a decent 720p quality stream. I've streamed and played at the same time using this internet, but the problem is slightly increased ping, around 100-130. It's playable, but sometimes it spikes up to 300-500 in bigger teamfights (yes, I'm talking about league).

So... Any ideas are welcome, just throw it at me and I can google the rest if u don't wanna go into details or have no time to explain.

tl;dr - Got 2 internets (1st is from the router, 2nd is 3G internet from my iPhone). iPhone has a decent upload speed for streaming. I want to use 3G for streaming and the main internet from my router for everything else.

 

[Sapiens]

Settings > Advanced > Bind To Interface

You can select the adapter that OBS uses to stream with this option, though I do wonder if using a 3G connection for streaming will yield acceptable results. I suppose it really depends on how stable the connection is. Only one way to find out. :)

 

[FerretBomb]

Set your primary wired connection higher in your Windows networking setup so it's prioritized. Then set OBS to bind to the interface that uses the 3G connection (prioritized lower in the Windows networking setup).

I'd have to echo Sapiens' uncertainty... 3G/HSPA isn't meant for high-volume, constant data throughput. It'll be very susceptible to major packet loss and interference, and is unlikely to work well/smoothly for streaming.
It also uses a LOT of data on a side note... expect to hit your data cap(/get throttled to RIDICULOUSLY slow speeds after 2GB if you're on TMobile) and have to pay for overages or end up cut off pretty quick.

 

[Aenymi]

The country I live in (which is in Europe) is pretty advanced. And by this I mean that the 3G connection is pretty stable. I was able to play and stream at the same time using 3G. Oh and there's no bandwidth limit on the service that I'm using. I used to have 3G as the only source for internet back in the dorm a year ago. Also shared it to my friends, since the dorm's internet was worse then my 3G lol. It does spike from time to time like every 10-15 minutes or so, but it's only for a few seconds. The quality is perfect at 720p and I didn't get any dropped frames at all.

Anyway, thanks for the quick answers. I'm trying to look into everything u said and will edit this post later.

//Edit:

Ok, so this is where I've got so far. I managed to set the Interface Metric both for 3G and LAN, so it would prioritaise LAN over 3G. I bound the 3G to OBS and it's working fine. However, I seem to get massive FPS drops suddenly from a random moment. Here's an example of the recorded stream footage: http://www.twitch.tv/cloudaenymi/b/473348479

It's fine until 1:10 and then suddenly at 1:26 the frame drops massively. It gets back to normal at 1:50. Any ideas are welcome for what may cause it as if it's possible to fix. I think it might be related to the software or something like that, since it's not doing so when I'm using only 3G for both playing and streaming. Maybe it interferes with LAN somehow?

 

[FerretBomb]

Post a logfile from that session. There's a sticky at the top of the forums explaining how to do it; it'll tell us if it's a local problem, or a network issue. I'd guess the latter already though; no matter how 'advanced' the infrastructure is, 3G is simply not designed for high-volume, constant and stable data transmission. It's like an even-worse version of wifi, as far as streaming is concerned.