Why tee will freeze the pipeline?

[Yakov Sudeikin]

http://pastebin.com/tWGsELib

This is a dot file.

I added a tee element and the pipeline is stuck in READY.

But both branches (ximagesink, rtmpsink) will play if used alone without
tee.

What prevents it from playing both branches at once?

Thank you
Yakov
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