[Bug 797007] Warning log printed when running glvideomixer command

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797007

--- Comment #3 from Qi Hou <qi.hou at nxp.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)

When the command in reproduce steps is executed, all three video will start
playing on the same board simultaneously. 

It can be regarded as multiple thread from here. I tried the method you
provided to simply set signal_id to 0 after disconnecting, then the CRITICAL
log "(gst-launch-1.0:7428): GLib-GObject-CRITICAL **:
g_signal_handler_disconnect: assertion 'handler_id > 0' failed.
"appears.

If not to check g_signal_handler_is_connected or not to use mutex, and simply
to execute g_signal_handler_disconnect, the warning log is still printed.

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