[Bug 797020] decodebin3-parse: take input locking when updating group-id

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797020

--- Comment #1 from HoonHee Lee <hoonh83.lee at gmail.com> ---
Created attachment 373451
  --> https://bugzilla.gnome.org/attachment.cgi?id=373451&action=edit
decodebin3-parse: take input locking when updating group-id

Dear All

Please review my patch.

Thanks.

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