Using rviz for data playback & analysis [closed]

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I am trying to use rviz to playback data for offline analysis. I would really like to change time forward/backward, and playback speed. I expect that I can do it by adding a display panel plugin with my controls to rviz, and manipulating the duration, rate and time of the marker messages that I'm publishing based on the users manipulation of those controls.

Is there an easier/better way?

I'm using Hydro, Ubuntu 12.04, C++ if it matters..