[Bug 689326] adding fd to multifdsink makes assertion `set != NULL' failed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=689326
  GStreamer | gst-plugins-base | 1.x

--- Comment #4 from qmax <qwiglydee at gmail.com> 2012-12-02 04:44:53 UTC ---
Solved:

The critical mesages refer to multifdsink->fdset which is initialized at 
gst_multi_fd_sink_start_pre

That leads that the element has to be in PLAYING or READY state before adding
new fd.
This is quite not obvious and probably should be documented.

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