How can I get an audiobook's playback position synced between Mac and iPhone?

Question

I have several Audible audiobooks, both on my iMac and on my iPhone. I listen to the audiobook on either the computer or the phone, depending on the circumstances. Both the iMac and the iPhone will independently remember the playback position within the audiobook, but I cannot get them to sync those playback positions to each other. So if I'm on chapter 2 on the iMac, listen for a couple of hours, and end at chapter 4, then the Mac will remember the correct playback position when I return to the book, but if I sync the iPhone to the Mac, and check the audiobook on the phone, it is still at the playback position it was the last time I listened to the book on the phone. Should the playbook position in the audiobook sync when the phone is synced to the computer via iTunes? I've tried both wired and wireless syncs, and that doesn't seem to make a difference on my case. Should this work, and if so, is there a particular setting that I'm missing?

Answer 1

I am tracking the movement of various objects by subtracting the current image from the previous image and displaying the result.  Anything that moves is white and anything that doesn't is black.  I then have vision assistant give me a list of particles and their pixel positions based on certain criteria.  I then use the data from my two cameras pointing at 45 degrees inward in order to triangulate the object's 3-D position in space (this takes a few steps).  Then I use the frame rate of the camera and the scalar distance between an object in multiple frames to determine its scalar and vector velocities.  All of this is done in real time.
I  was originally having issues with the pixel positions but have since wrote a vi that interprets a matrix of the pixel positions which then feeds them into my position/velocity vi.
The vi I attached is built to work with my "bitflow alta frame grabber" so feel free to ask questions if anything is not understood.
My new task has been to develop a way to only track one object at a time, and have that object be the same object in both cameras. 
Questions or comments welcomed 
Attachments:
continuous grab example_chad.vi ‏45 KB