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It looks like it's throwing here: https://github.com/ros/ros_comm/blob/ace5b9c11af766564441bad2cb08f5fca5b73784/tools/rosbag_storage/src/bz2_stream.cpp#L151

My guess is that there's a maximum number of supported elements in the bag which this is violating since this is a lot of small messages the 2Gb chunking sizes doesn't keep the number of messages low.

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