[Bug 755782] compositor: Segmentation fault

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755782

George Kiagiadakis <gkiagia at tolabaki.gr> changed:

           What    |Removed                     |Added
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 Attachment #347045|0                           |1
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--- Comment #14 from George Kiagiadakis <gkiagia at tolabaki.gr> ---
Created attachment 347083
  --> https://bugzilla.gnome.org/attachment.cgi?id=347083&action=edit
videoaggregator: prevent running prepare_frame() on late configured pads

Here is a better patch, this should prevent the problem at the videoaggregator
level, hence also preventing similar problems in other elements based on
videoaggregator.

I am still not sure about the theoretical case where a sink pad *changes* caps
in this racy way. In this case, set_info() will run with old format info and
prepare_frame will run with a buffer containing new format info. This will
probably result in a single-frame glitch somewhere in the picture.

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