[Bug 40179] Cannot insert mpg files in Powerpoint 2010

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40179

--- Comment #4 from Andrew Eikum <aeikum at codeweavers.com> ---
I've added a new ARGB filter to winegstreamer. Unfortunately, this commit:

commit 46d5973961fe2266074ac2855368c3fcf987c1b5
Author: Akihiro Sagawa <sagawa.aki at gmail.com>
Date:   Fri May 8 00:37:21 2015 +0900

    mciqtz32: Guarantee that CoInitialize and CoUninitialize run on the same
thread.

causes a deadlock. Since that commit, the main thread spawns a new thread to
handle the MCI_OPEN command. The new thread eventually calls SetParent, setting
the parent of the videorenderer window to a window owned by the main thread
which called MCI_OPEN. Since the main thread is blocked waiting on the newly
created thread to finish, this deadlocks since the messages from SetParent to
the main thread never get handled.

One solution is to handle the MCI_OPEN command on the main thread, so the
SetParent occurs on the main thread and doesn't deadlock. But that seems to
break what Akihiro was fixing in the first place. Still looking into it...

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