My (Windows) application needs to show individual video frames, and the user needs to position a "box" over some part of the image. I can currently load the URI, display the frame (the pipeline is paused), and draw on it using the cairo overlay. The pipeline looks like this:
uridecodebin uri=file:///c:/BlincRnD/EyeCloseUp.mov
! queue ! videoconvert ! cairooverlay name=overlay ! autovideosink name=videoWin
Now I'm trying to do the "draw the box" part. I can get the mouse buttons and window position using the wxWidget events. Obviously the window coordinate is *not* the same as the frame coordinate, so I can't simply use the mouse position without knowing the transform.
Searching these archives, I saw mention that I would need to write my own video filter plug-in to handle the GstNavigation events. This post refers me to the navigationtest plug-in. Using gst-inspect, I do not have the navigationtest plug-in in my install. Where can I get it? I'd like to watch it run.
Can anyone suggest an alternative solution for positioning my cairo drawing on the video?
Thanks.
-reilly.
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