Only allow setting Bus sync handler and AppSrc/Sink callbacks once
Re-setting them is not thread-safe and can cause segfaults or worse.
See gstreamer#506 (closed) and gst-plugins-base#729 (closed)
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Re-setting them is not thread-safe and can cause segfaults or worse.
See gstreamer#506 (closed) and gst-plugins-base#729 (closed)