[ros-users] [Discourse.ros.org] [Next Generation ROS] Smaller Rosbags with hashed strings

[Davide Faconti]

Hi,

As we know rosbag can be quite big. In many real world scenarios a considerable space is used by strings, since ros message use extensively names as identifiers (example: name of joint or frame_id).

LZ4 compression does a very good job in term of speed vs size reduction.

I wonder if raw rosbag might use hashed string to reduce the serialize size? It can be done quite easily, I think, using a library like this one https://github.com/foonathan/string_id

What do you think?

If the community consider this upgrade useful, I can try implementing it myself :smiley: and do a pull request.

Davide






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