Looking at the console output of gallery-app, we find this:

(vs-thumb:5892): GLib-ERROR **: /build/buildd/glib2.0-2.41.3/./glib/gmem.c:353: 
overflow allocating 4294967274*8 bytes
Thumbnail generator failed:  Unknown error when trying to extract video 
screenshot, return value was �.

(vs-thumb:5922): GLib-ERROR **: /build/buildd/glib2.0-2.41.3/./glib/gmem.c:353: 
overflow allocating 4294967274*8 bytes
Thumbnail generator failed:  Unknown error when trying to extract video 
screenshot, return value was �.

However if you run the command manually (/usr/lib/arm-linux-
gnueabihf/thumbnailer/vs-thumb Videos/camera/video20140905_0001.mp4
foo.jpg) then it works. I have no good explanation for this.

This all points very strongly towards a bug in the video stack (i.e.
GStreamer).

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https://bugs.launchpad.net/bugs/1362818

Title:
  no previews showing up for recorded videos in camera/gallery/video
  scope

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