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Isn't there already an implementation somewhere to extract left and right images with identical timestamps from a rosbag? This seems quite a basic thing that should be part of ROS, given how much stereo cameras are used nowadays in robotics.

If someone has such a node, can it be shared please?

I can write my own I guess, but maybe someone else has a good implementation for this and sharing it would make life easier for me and many other ROS users.

If someone has such a node, can it be shared please?

I can write my own I guess, but maybe someone else has a good implementation for this and sharing it would make life easier for me and many other ROS users.

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After googling around a bit I have found two possible solutions that are already available to extract synched stereo_pairs from a rosbag.

Method 1) Use the rospy node that comes inside image_view from the image_pipeline. It can be run with
rosrun image_view extract_images_sync _inputs:='[/camera/left/image_raw,/camera/right/image_raw]'

Just modify the topic names and the rospy node according to your needs.

Method 2) Use this package http://wiki.ros.org/bag_tools?distro=indigo
It has some nice tools for working with rosbags acquired with stereo_cameras.

I hope this can be helpful to other ROS users!

Cheers!