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You can use jsk_rosbag_tools to extract video from bag files. https://github.com/jsk-ros-pkg/jsk_common/pull/1738

Example

rosrun jsk_rosbag_tools bag_to_video.py $(rospack find jsk_rosbag_tools)/samples/data/20220530173950_go_to_kitchen_rosbag.bag \ --samplerate 16000 --channels 1 --audio-topic /audio \ --image-topic /head_camera/rgb/throttled/image_rect_color/compressed \ -o /tmp/20220530173950_go_to_kitchen_rosbag.mp4