The number of images extracted is lesser than the messages specified in the bag file
Hi all,
I am trying to extract images from a bag file. I am posting the images related contents of the bag file alone, below:
path: dataset-2-2.bag
version: 2.0
duration: 58:53s (3533s)
start: Oct 04 2016 00:23:10.30 (1475520790.30)
end: Oct 04 2016 01:22:03.91 (1475524323.91)
size: 182.8 GB
messages: 5800842
compression: none [211980/211980 chunks]
types:
sensor_msgs/Image [060021388200f6f0f447d0fcd9c64743]
topics:
/center_camera/image_color 70659 msgs : sensor_msgs/Image
/left_camera/image_color 70660 msgs : sensor_msgs/Image
/right_camera/image_color 70660 msgs : sensor_msgs/Image
The number of images are 70660. Based on the duration of 3533s and numbre of images, the secperframe works out to be 0.05 (20fps)
I ran the following .launch script to extract the images:
<launch>
<node pkg="rosbag" type="play" name="rosbag" args="-d 2 /path/to/dataset.bag"/>
<node name="extract" pkg="image_view" type="extract_images" respawn="false" output="screen" cwd="ROS_HOME">
<param name="sec_per_frame" value="0.05"/>
<param name="file_format" value="frame%05d.jpg"/>
<remap from="image" to="/left_camera/image_color"/>
</node>
</launch>
But I am only able to extract 10923 frames and the process is finishing cleanly as well. I am not able to understand where the issue is. Am I missing some flag? Please help me in this regard. I am a newbie to ROS.
Asked by vishwa on 2016-10-27 01:21:57 UTC
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