Uploading Better Footage After Livestream


So I do Livestreams everyday and the quality is not always the best because the internet isn't perfect. I've noticed that other streamers, like Markiplier, will stream and the video will have issues, yet when I play the same clips back later it will be perfectly smooth and have no audio issues. Is this due to a setting I am unaware of, or do they upload the footage again and have it worked out with YouTube to have the comments, views, and likes applied to the upload of the footage? Is there a button I am missing that allows me to do the same?
No its streamed using a capture card connected to the camera.
I do the same and its absolutely epic live streams.
I will do a detailed video about my live streaming setup soon.