I have content that played on some iOS devices and fails to play on others, when it served from Wowza Server. Same files played perfectly on all iOS devices when it served from other streaming server ( H264 streaming plugin for ApacheHTTP ). It seems that the issue is H264 profile data, that sent to client. There is no explicit profile label in movie metadata, so I assume that Wowza calculates it by itself. Can anybody explain me how it done?