Hi @nhungph. The limit is not in the plugin, free or premium, but in your JW Player license. If I’m not making a mistake, HLS playback requires a premium license.
More informations here:
https://www.jwplayer.com/pricing/
https://support.jwplayer.com/customer/en/portal/topics/564477-streaming/articles
https://support.jwplayer.com/customer/portal/articles/1430240-adaptive-streaming
Online tester:
https://developer.jwplayer.com/tools/stream-tester/