[digikam] [Bug 376661] When importing ~200,000 video files Digikam crashes in about 2-5 seconds of starting.

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https://bugs.kde.org/show_bug.cgi?id=376661

--- Comment #16 from caulier.gilles at gmail.com ---
Mario,

In my office we capture Infrared plan sequence of events in a Tokamak to catch
physical dysfunctions while experience.

video can take more than 2 minutes in HD, no more. More than 20 experiences can
be done in a day. All video are lossless stored in a database.

There is no camera movements. Only the plasma inside the machine change the
contents. Depending of the experience parameters, the video contents willbe
different.

We have a process to recognize similar video into the database. It written in
Matlab. As i know the process cut the first frames where there is nothing
(black hole) until the light begin. After that a wavelets fingerprints is
computed with a flat image taken from some frames inside the video. Not whole
video is analyzed, but the algorithm try to detect the edge of change and
adjust the fingerprint, by parsing a section of the movie. This is how the
spacial (temporal) dimension is processed.

For each file, the fingerprint can give the average of similarity of video
comparing to others. When physicians want to look in experiences, they just
compare a video made with Tokamak settings and look if another one is similar.
The goal is to see if physical events are similar even if parameters are
different.

Of course, it's a special use case, as video are static plan with changing
contents, but i think the process is not too bad if we want to apply it on a
small section of DSC movies.

Note : I know just the theory. The code is not available of course.

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