[Bug 767268] Add missing filename type annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767268
Bug 767268 depends on bug 767266, which changed state.

Bug 767266 Summary: Add missing filename type annotations
https://bugzilla.gnome.org/show_bug.cgi?id=767266

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

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