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How to decode binary data from a rosbag ?

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When i try to echo the topics of a bag file, i get a message : ` data: !!binary | ChQJpiM5J7b11UESB2dhdGV3YXkYSRI7GAEt0YmNPjUAAAAARQAAAABNAAAAAF0AAAAAqAEAsAEA uAEAygEUCaYjOSe29dVBEgdjaGFzc2lzGAcamgEKGwl+jANaaLcaQRG3Y7kbwu1QQRlNc4QFq/qd vxIkCQAAAAAAAAAAEQAAAAAAAAAAGbZX/zsVBNw/IYPT7lNnxew/GhsJlaAsEDqx0T8R+pqtiJCs kzwZBQSdL5XVZj8iGwmW/f98qKacPxHERbyH1aKhvBlzAOArHy9+vyobCfeLggMmjbI8ER2XZG1t Jzg/GfBTn4g5Yn08IQAAAAAAABxA` This data seems to be binary encoded. The message type of this topic is `string`. How can i read this data ?

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