Hi,
If you are using Apple HLS then you can add the following property
Name: cupertinoCalculateChunkIDBasedOnTimecode
Value: true
Type: Boolean
in /Root/Application/LiveStreamPacketizer
See How-to-get-started-as-a-Wowza-Streaming-Engine-Manager-administrator#addProperty on how to add properties using the Manager if you need help.
Andrew.