We use Smooth streaming for years now (since SL2). We use custom version of player based on SMF from Codeplex.
I wonder if this old issue with SSME to not be able to play clips starting in the middle of a chunkis going to be fixed ever?
(the actual issue is that - all the chunks in smooth streaming are 2 sec long, when you create a composite manifest the clip should start where the nearest chunk starts hence the error is ~2s on each clip, if you have several clips you can accumulate significant error, if you write csm with clip starting not from 2s border sharp, the Silverlight smooth streaming media element (SSME) will return error 3222).
[EDIT: of course I use BufferingEngineSettings ForceAccurateSeeks=”true”]
[EDIT EDIT: This is actually Silverlight Smooth Streaming MeadiaElement issue not IIS]