What is the limit on simultaneous connections? I mean, how many people can be connected to a live event?
There's not a specific number. A similar question could be, "how many people can visit my website". There's a lot of factors to consider. The main ones are related to bandwidth and ability to scale. For Azure Media Services this means primarily:
The type of streaming endpoint (Standard or Premium).
The number of scale units if Premium.
Whether or not a CDN is used.
CDN optimizations that are set.
The CDN can provide significant caching and request consolidation with live streams. With on demand content there is generally less opportunity to cache content since clients are not all watching the same thing at the same time like with live streams.
See https://docs.microsoft.com/en-us/azure/media-services/latest/stream-streaming-endpoint-concept for more information on Media Services streaming endpoints.
5 people are following this question.