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I think you bring up a good point that there isn't really a centralized place to find out about working with recorded data. There are of course the wiki pages for rqt_bag/rqt_plot/rosbag, but those are specific to those tools. For example, I needed to export video from a bag and the relevant wiki page wasn't sufficient, so I had to write my own tool to export variable framerate video (https://github.com/OSUrobotics/bag2video). I bet somebody else has already done this, but couldn't find anything. Countless times, I've also had to write one-off scripts to export data as mat files.
Anyway, a wiki page with a more comprehensive list of tools for working with recorded data could be very useful.