How does HTTP live streaming support subtitles?

Our app currently is on HTTP Live Streaming and everytime we scrub (fast forward or rewind) or if with low connection (buffering), the subtitle gets off-sync. Videos are segmented into 10 seconds so when you scrub, it jumps back to the nearest start of segment and when it does, it does not provide the exact and correct current playback time so we can't accurately compute for the offset, thus subtitle gets off synch.
Our one solution is to use ID3 tagging when we encode our videos so we know exactly the time when segments starts. Unfortunately, there are not much encoding system that uses this yet.
Any ideas on this?
Thanks!

Unfortunately, QTSS doesn't support HTTP Live Streaming. I wonder why Apple did not implement QTSS in Snow Leopard Server.
However, Helix Universal Server from Real can do the trick.
http://www.realnetworks.com/products-services/helix-server-proxy.aspx

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    Let me know if any of these suggestions help.
    Thanks,
    Apurva

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