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[Daniel Ellis <mail@xxxxxxxxxxxxxx>]

Yes, defaulting to the dissolve transition works nicely.  But I have
just seen a small problem with my first patch.  If I open one of my
larger projects, the list of missing transitions is very long, and so
this second patch now only displays a unique list of missing files, and
it also sorts the list.  This patch was from made from the latest
revision (298).

** Patch added: "Remove duplicate files from the list of missing transitions"
   https://bugs.launchpad.net/openshot/+bug/624850/+attachment/1527550/+files/remove-duplicates.patch

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Crash when previewing OSP files from an older version of OpenShot
https://bugs.launchpad.net/bugs/624850
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Status in OpenShot Video Editor: Fix Committed

Bug description:
My old OSP project files no longer work.  The application segfaults when previewing at the point it reaches certain transitions.

I have identified that the OSP files include references to paths such as '/usr/share/openshot/transitions/sand.svg' which no longer exists.  I think the paths have since changed to something like '/usr/share/pyshared/openshot/transitions'.

Could we make it so OpenShot scans these paths when the project is opened to make sure they exist?  Maybe it could then show a dialogue for resolving missing files.  I think the same dialogue would be useful for finding other missing resources, for example, in the scenario where someone has moved the folder which contains their source video.

The dialogue could offer options such as fully automatic scanning for the files, or offer the ability to point to a base path to scan.