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Active: 18156 users

PC to PC with Capture Card

Blogs > Basic
Post a Reply
Basic
Profile Blog Joined June 2010
Canada288 Posts
Last Edited: 2014-12-08 08:29:56
December 08 2014 08:28 GMT
#1
Hey guys!

So it has come to my attention that there are some annoying technical barriers when it comes to actually trying to stream another PC using a capture card. My fellow content creator Dino uses my ASUS laptop that although, is an amazing little piece of machinery, does not have the wear with all to stream at a low upstream bit rate. Fortunately I do own a capture card but there are some obscure issues you run in to that I thought I might talk about in order to help others who might have an interest in using this setup.

PC to PC Streaming

Now most of the issues you run in to are audio related and there are several different solutions to the problems you face. Mainly you get in to the issue of how to send the audio to your "Capturing" pc and still be able to hear in game sound your self. There are solution that involve using "Virtual Cables" that require no additional hardware. However I find the integrity of audio is easily deteriorated when using this system and I prefer the most losses solution possible. As such this is what I have devised.

The Problem

+ Show Spoiler +
So as I mentioned above, the main issue is being able to capture game audio and still be able to hear that game audio to play the game. Now, if you are willing to invest in a sound board, that is the most straight forward solution. This maximizes you ability to control sound with the least quality loss. That being said, this is not an inexpensive solution and I am all about good, affordable solutions. The sound board also does not help you out how to figure out strange interactions like Skype.


Simple Things

+ Show Spoiler +
I just want to mention right off that bat that being able to keep the computers in reasonable proximity is probably the most reasonable way to solve most issues inexpensively. This information is being given under the assumption you can keep your rigs with in a few feet or meters.


The Solution

+ Show Spoiler +
The solution is to strip a copy of the audio from the capture card through a HDMI Audio Extractor and send it back to a set of ear buds or any other audio output device. In theory you could then sent the signal on to a monitor as well if you want a second view of what is being sent to the capture PC via the capture card.

Required Equipment:
  • Recording Capable PC
  • HDMI Out Read PC
  • Elgato (Or any other HDMI) Capture Card
  • HDMI Audio Extractor
  • Main streaming headset
  • Secondary audio output (ear buds recommended) or second mic
  • 2 HDMI cables


Equipment Explanation:

I am including a picture that shows the setup, as it is a lot simpler than reading it but a brief run down of what some of these things are or why you need them is necessary. One PC needs to be capable of streaming at whatever settings you find satisfactory. This computer for all intensive purposes is the more powerful PC. The second PC simply has to have an HDMI out port and be able to handle outputting a secondary or mirrored monitor. The capture card is what is sending the video/audio single to the capturing computer. The HDMI audio extractor is what is going to let us solve our audio issues. You require a headset and secondary audio outputting device to be able to handle awkward audio interplay with programs like Skype and streaming programs. The cords, well they're the cords you need.

If you do no know what an HDMI Audio Extractor is, this is an example. It simply allows you to take only the audio from the HDMI signal.They can use numerous different audio outputs, so find one that suits what you need, be it 3.5mm, Coaxil, OPtical etc.

HDMI Audio Extractor

Setup Image:

[image loading]


Final Notes

+ Show Spoiler +
Now you have to use your main head set, or good mic at least with the capturing PC that will be doing the streaming so that the correct PC has access to you talking. This means if you want to Skype with a team, or Team Speak, etc... You have to do it through the capturing computer. This is why for the second audio output device I recommend using ear buds so you can layer the audio in you ears. Two get both audio sources to come through a single source, well then you are back to VAC's or a sound board.

Another possible solution is that you use to mics. Still requires the exact same setup, run audio program on the output PC but a second mic is still attached to the capturing PC. This allows you to hear everything and for both the stream and VoiP program to hear you.


Hope this was helpful,

Basic








itsjustatank
Profile Blog Joined November 2010
Hong Kong9176 Posts
December 08 2014 15:47 GMT
#2
how bad is the audio delay doing something like this
Photographer"nosotros estamos backamos" - setsuko
Basic
Profile Blog Joined June 2010
Canada288 Posts
December 08 2014 17:06 GMT
#3
There isn't any. The Capture card post processes the stream, meaning the audio/video signal is sent in priority through the line and captured as a second priority.

Wouldn't be much of a work around with audio delay, else I would just recommend feeding stream audio back in to a single head set.
ttbek
Profile Joined July 2012
4 Posts
Last Edited: 2014-12-09 00:14:45
December 09 2014 00:10 GMT
#4
Was a double post, not sure how to delete it.
ttbek
Profile Joined July 2012
4 Posts
December 09 2014 00:13 GMT
#5
Audio delay isn't an issue here, audio/video sync could be off if one of them somehow lags out badly, video being the likely culprit there. This depends on your streaming software of course and how it handles syncing two streams. I don't think it would be an issue though. You don't have to go through the trouble of extracting the audio from the HDMI signal though, you can have the source PC output audio over the 3.5 jack instead, it's not forced to use the HDMI for audio output. The PS3 also includes this option, whereas the Xbox 360 actually did not. So using the PS3 with a computer monitor was feasible with sound whereas you really had to have a TV (or one of those audio extractors) to have sound with the Xbox 360. If you want to use headphones then as well as send the audio to the other machine, 3.5mm splitters are super cheap. You might also want to look at some low latency audio stream software, like JACK.
Basic
Profile Blog Joined June 2010
Canada288 Posts
Last Edited: 2014-12-09 02:32:21
December 09 2014 02:30 GMT
#6
Thanks for the post(s) ttbek,

The problem here is you get in to the business of certain programs only allowing one output device (a default device) and then I am once again at the point where I have to "listen" and reoutput that sound somewhere else with some sort of virtual audio cable.

For instance League of Legends does not give you an option where to output sound, so for the secondary computer to get the games sound, the capture card has to be the default audio output.

Again I could use a configuration that "faking" a mic that the capturing computer then takes audio in as if it were a microphone but that still requires me to set up some sort of VAC.

If I simply send audio out to a different audio output on the source computer, the capturing computer does not get output sound at all.

You are right, I could just split off a 3.5mm jack and send audio to a mic port on the capture computer, unfortunately this configuration does cause a need for audio delay. Elgato capture cards grab the audio and video in sync but taking the video and audio from two different output devices means a delay between then audio and video signals. Add in the complexity you get when using a VoiP and I am still not sure this solution works entirely.

Your input is extremely appreciated; thank you so much for the feedback,

Basic

Edit:

Just a side note, HDMI Audio Extractors are only about $30 bucks, more than a 3.5mm splitter for sure but not the worst.


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