DESCRIPTION:
When using "Songbird 1.1.1" on Mac/Linux/Win32, seeking to the end of a song using the seek bar sometimes results in an error message: "Internal playbin error."

******** Relevant log output ********
playbin2 gstplaybin2.c:1910:no_more_pads_cb:<player> no more pads in group 0x938ae0

(<unknown>:21033): GStreamer-CRITICAL **: gst_ghost_pad_new: assertion `!gst_pad_is_linked (target)' failed

(<unknown>:21033): GStreamer-CRITICAL **: gst_pad_link_prepare: assertion `GST_IS_PAD (sinkpad)' failed
playbin2 gstplaybin2.c:1925:no_more_pads_cb:<player> linked type audio/x-raw-, result: -6
playbin2 gstplaybin2.c:1929:no_more_pads_cb:<player> error: Internal playbin error.
playbin2 gstplaybin2.c:1929:no_more_pads_cb:<player> error: Failed to link selector to sink. Error -6
******** Relevant log output ********


POSSIBLE REASON:
I'm a beginner to gstreamer, but it seems to me that the problem might be the following:
1. In gstplaysink.c (from gst-plugins-base 0.10.22, lines 1532-1546), an "audiotee" element is created lazily.
2. After that, a ghost pad is created (lines 1547-1552):
 playsink->audio_pad =
            gst_ghost_pad_new ("audio_sink", playsink->audio_tee_sink);
3. At some point, the ghost pad is released in gst_play_sink_release_pad() (lines 1592-1615).
4. Next time when a ghost pad is created in step 2 above, the "playsink->audio_tee_sink" element is still linked to some other element, therefore gst_ghost_pad_new() asserts and fails.

So in short, the problem seems to be that no one unlinks the audio_tee_sink element from its peer.



SUGGESTION:
Unlink the audio_tee_sink element in gst_play_sink_release_pad(). For example, add the following line to gstplaysink.c (line 1603):
gst_pad_unlink(playsink->audio_tee_sink->peer, playsink->audio_tee_sink);

So that it will look like;
  } else if (pad == playsink->audio_pad) {
    res = &playsink->audio_pad;
    gst_pad_unlink(playsink->audio_tee_sink->peer, playsink->audio_tee_sink); // line 1603
  } else if (pad == playsink->text_pad) {

This solves the problem for me, and it seems that it does not introduce any other problems.