Optional
cachedTime after which a cached segment expires, in seconds. If set to undefined, the cacheSegmentExpiration is disabled for VOD streams, and a default value (20 minutes) is used for live streams.
Maximum number of segments to store in the cache. Has to be less then httpDownloadTimeWindow and p2pDownloadTimeWindow. If set to 0, the cache is unlimited.
Represents the configuration for the Core functionality that is common to all streams.