Bug ID: 368962
           Summary: Git master:2016-09-17:Changing project FPS corrupts
                    clip segments on timeline
           Product: kdenlive
           Version: unspecified
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: User Interface

This is totally related to bug 357780 - In fact, it is just a subset of the
issue. I saw someone get a bug fixed on project FPS change, and thought I would
start small. 

Sooo, what's needed to see the issue quite clearly is a special clip.
Start a 25fps project, and make a generator that counts the frames. Use about
3000 frames to make the issue painfully obvious. 

Render this generator to get a clip at 25fps. 

Import that rendered clip into the project, and select a section from the clip,
say from frame 1400 to frame 2000. 

Drag this segment into the timeline. Dragging your cursor over the timeline
shows the frames 1400 - 2000 in the clip. 

Now, change the project framerate to 50fps. 

When dragging your cursor over the segment on the timeline, frames 700 - 1000
are now displayed, instead of frames 1400 - 2000, with each frame duplicated. 

Conceptually, if you select a segment from a clip, you are interested in
something that happens in that range of frames. When changing the project's
framerate, the range of frames should be preserved. 

The simplest formula for this is from Orig_Start/Orig_Fps*Dest_fps, rounded up
to the nearest integer, until Orig_Stop/Orig_Fps*Dest_Fps, also rounded up to
the nearest integer. 

There might be a frame or two extra or taken away from the clip on the
timeline, however this is much better than displaying the completely wrong
segment of the source video. 

Until this is fixed, changing the framerate on a project completely corrupts
all the clips on the timeline. 

Reproducible: Always

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