If you want to try Twitch of Youtube game streaming, here is how you do it.
-------------- Create a Twitch account ----------------
Go to:
https://www.twitch.tv/Create an account.
In the Settings for your account, go into the "Channels & Videos" tab and make sure "Automatically archive my broadcasts" is selected (so that your streams are saved on Twitch for a while). That way, after you stream, you can keep the video of it on their site for a while, edit it, etc. if you want. Very handy!
Open your Dashboard. Click on "Stream Key" tab. Click on "Show key". Copy that stream key (as you will need to paste it below). Click on the "live" tab. Type a name into the title of your broadcast you are soon to start (such as "My test AH broadcast" or whatever). Click on "Not playing" and select "Playing" instead. Click the "update" button -- you are now ready to start streaming to Twitch with OBS.
------------- To get OBS up and going -------------------
Download OBS Studio (not the older OBS Classic):
https://obsproject.com/Install it.
Run the 64-bit version (or 32-bit as appropriate for your system).
In File->settings->Stream, select the streaming service you want to use (such as Twitch). Select the server closest to you. Paste in your stream key.
In the "Scenes" box on lower left, add a scene called whatever you want.
In the "Sources" box in the middle, add a "Game capture" and name it anything you want.
Put your mouse pointer into the preview-screen section (which is probably blank currently), and right click. Scroll down to "Transform" and select "Fit to screen". This way, your AH session will (after OBS rescales it to 720p) be fit to the final format correctly. (This is the only confusing part of OBS, as it allows you to put your game stream into only part of the screen if you want, and it's a little finicky on that setting.) If you have problems later with it looking like OBS is making a video of only a portion of your AH full-screen graphics -- this is the likely cause.
------------------- Start AH --------------
Start up Aces High.
In OBS, click "start recording" or "start streaming" (whatever you want to do).
Go into your full-screen Aces High, and away you go.
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If you want to check streaming, go to twitch.tv and go into the Dashboard for your account. There is a window there that shows what you are broadcasting. Press "alt-tab" to get out of AH full screen and take a look at what is showing in that Twitch Dashboard video preview.
If you want to make a video and see if it looks OK, that's a good test, too. By default, OBS makes flv files, which you can play with the free VLC media player available here (
https://www.videolan.org/vlc/ ). Press the "start recording" button in OBS, and you are creating a movie file on the fly. Go back into AH full screen, fly around a bit, then stop recording and play the video in the VLC player to see how it looks.