Simplify importing image sequences

[Vadim Peretokin]

I accidenally forgot the 'd' in IMG_%04.JPG, and OpenShot didn't tell me there was any issue or anything - it simply did nothing when I pressed the imprt button.

[Olivier Girard (eolinwen)]

A message error could be add for this error.

[Olivier Girard (eolinwen)]

In fact, a message error exists (but at first look, not for that). I am searching why.

[Jonathan Thomas (jonoomph)]

Added a automatic image sequence finder, which creates the regular expression automatically when an image that belongs to an image sequence is imported. Just drag an drop an image that belongs to a sequence into your project files, and it will prompt you to import the matching files. Seems to work pretty good. =)

[Jonathan Thomas (jonoomph)]

Also, added a new "Repeat Sequence" field, which will repeat the image sequence as many times as requested. For example, think of a walk cycle animation.

[Vadim Peretokin (vperetokin)]

That's neat. Would it be possible to allow the specification of a transition
to use?

My main reason for looking into this is to create animoto-like templates for
openshot to use with this... they have an awesmoe idea, but the pricing is
very awkward. I think enabling this to be done in openshot (creation of
movie templates to be filled in with pictures) would be a good boost to
popularity.

[Andy Finch (fincha)]

You can specifiy a transition when you drop them onto the timeline - see http://www.openshotvideo.com/2011/01/add-many-clips-to-timeline-in-1-step.html