ROS bag support

[aMarcireau]

Add support for ROS bag files

[Jegp]

Is there a standard format for this? Meaning, isn't rosbag files just a dump from a ROS topic. Would you enforce some kind of protocol here?

[aMarcireau]

That's a good point! I am not quite sure yet, I opened the issue after a discussion with Greg (who mentioned that a lot of datasets use ROS bags or HDF5).

I am hoping that the datasets are uniform enough that we can define reasonable defaults with a handful of configuration parameters (similar to our implementation of CSV decoding/encoding).

[Jegp]

Agreed, that sounds like a good hope to have. Maybe it's a good idea to start with simple examples and then work from there. No reason to overcomplicate it... Yet!