ROS launch file for extratcting images from a bag file.

bagfile2images.launch

<launch>
  <arg name="IMAGE_TOPIC" default="/camera/image_raw"/>
  <arg name="FILENAME" default="test.bag"/>
  <arg name="SAVE_PATH" default="ROS_HOME"/>
  <arg name="FPS" default="10.0"/>
  
  <node pkg="rosbag" type="play" name="rosbag" required="true" args="$(arg FILENAME)"/>
  <node name="extract" pkg="image_view" type="extract_images" respawn="false" required="true" output="screen" cwd="$(arg SAVE_PATH)">
    <remap from="image" to="$(arg IMAGE_TOPIC)"/>
    <param name="sec_per_frame" value="$(eval (1/arg('FPS')))"/>
  </node>
</launch>