Could you tell me async-start and async-done message in playbin?

[HoonHee Lee]

Hello~~
I have a question about async-start and async-done message in playbin.

In normal case, async-start message is posting to upper layer of pipeline by
gstbin when bin is top level.
But I am not sure, async-done message is posting once to upper layer of
pipeline??
If not,  async-done message is posting to upper layer of pipeline whenever
async-done message is generated by element in pipeline??

If I use playbin to play contents with autovideosink and autoaudiosink.
After configuring pipeline(playbin), I perform flush seek using
gst_element_seek (playbin....).
After seek event has done with flush, each async-done messages that are
generated by autovideosink and autoaudiosink are posting to upper layer of
pipeline???

Aayway, I am wondering that async-start and async-done messages are posting
once to upper layer of pipeline? or not??





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