I had a .bag.active file that was 12.2GB in size and I wanted to recover it to a .bag file, so I ran rosbag reindex xxx.bag.active and I got a 12.2GB .bag.orig.active file. However, the .bag.active file became 117MB . Then I ran rosbag fix --force xxx.bag.active xxx.bag, and I got a 116MB .bag file. It seems that some data was lost during the reindex process. I also looked at the generated rosbag with the rosbag info command and found that the data in it was only a few seconds long, but in fact I recorded several minutes data. Why is that? Does anyone have a way to recover the rest of the data, because it's not easy to collect, so I would really appreciate it if there is any way to recover it.