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Numbe of extracted messages is less than number of messages

Hi, I am new to ROS and need some help.

I recorded 4754 messages in a bag file from a camera with 10 FPS.

I extracted messages by

rosrun image_view extract_images _sec_per_frame:=0 image:=/camera/rgb/image

but the number of extracted images is always less than the number of messages. The number of images is 4065..

I played with the value of _sec_per_frame such as _sec_per_frame=0.1, 0.01, 0.001 but not successful.

How do I extract the same number of images as the number of messages?

Thank you!