ros2 unbag - fast ROS 2 bag export for any format

ros2 unbag is a ROS 2 CLI plugin with optional GUI for extracting selected topics from .db3 or .mcap bag files into formats like CSV, JSON, PCD, images, and more. It comes with export routines for all message types (sensor data, point clouds, images). You need a special file format or message type? Add your own export plugin for any ROS 2 message or format, and chain custom processors to filter, transform or enrich messages (e.g. drop fields, compute derived values, remap frames). Optional resampling synchronizes your data streams around a chosen master topic—aligning each other topic either to its last‑known sample (“last”) or to the temporally closest sample (“nearest”)—so you get a consistent sample count in your exports. For high‑throughput workflows, ros2 unbag can spawn multiple worker processes and lets you tune CPU usage. Your topic selections, processor chains, export parameters and resampling mode (last or nearest) can be saved to and loaded from a JSON configuration, ensuring reproducibility across runs.