We live stream to YouTube via OBS (Open Broadcast System) in which we live edit from a number of acive cameras.
Our cameras capture the principle speakers, the singer/backing singer, band, and the audiance reaction, etc and we chose what picture to show on the fly.
We also bring in pre-recorded video clips, images, slideshows, titles and other media sources into the live feed.
The normal live stream quality is 720HD which is high quality enough for most situations.
