Some images don't appear with the right orientation.
This is because Processing does not use EXIF metadata

JNA: Callback org.gstreamer.elements.AppSink$2@40225f77 threw the following exception:
java.lang.NullPointerException
at org.gstreamer.elements.RGBDataAppSink$AppSinkNewBufferListener.newBuffer(RGBDataAppSink.java:162)
at org.gstreamer.elements.AppSink$2.callback(AppSink.java:184)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.jna.CallbackReference$DefaultCallbackProxy.invokeCallback(CallbackReference.java:485)
at com.sun.jna.CallbackReference$DefaultCallbackProxy.callback(CallbackReference.java:515)

(java.exe:5144): GStreamer-CRITICAL **:
Trying to dispose element inputselector1, but it is in PLAYING instead of the NULL state.
You need to explicitly set elements to the NULL state before
dropping the final reference, to allow them to clean up.
This problem may also be caused by a refcounting bug in the
application or some element.

(java.exe:5144): GLib-GObject-WARNING **: instance of invalid non-instantiatable type `(null)'

(java.exe:5144): GLib-GObject-CRITICAL **: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

If the application is quit whilst a ThumbnailWorker is still working, this can lead to corrupted jpg files in the 'thumbnails' folder