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No. rosbag may skip messages during playback to maintain the desired playback speed. If rosbag starts playing messages immediately, the first message or two may be missed by the subscriber, before the topic is set up.
You can use the -d option to have rosbag delay between advertising a topic and starting playback, to give subscribers time to connect.
You can slow down the publish rate with the -r option, and this can help prevent dropped message; this works particularly well when used with the --clock option and the use_sim_time parameter.
Have a look at the rosbag command line page for more interesting options that you can use with rosbag.
As described by @ahendrix, data apparently could be dropped if the desired playback time would otherwise not be reached. Two further potential caveats:
rosbag play) and
subscriber sides. For both, the queue size has to be set appropriately (See queue related params for rosbag (play) and for subscribers.Asked: 2016-01-21 01:06:05 -0500
Seen: 1,569 times
Last updated: Jan 21 '16
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