roslaunch usb_cam usb_cam-test.launch,the cam window is weird

[Lee-xiao]

I tried to open the cam in the ROS ,and I input the following instruction in the terminal： roslaunch usb_cam usb_cam-test.launch but my cam window show like following: What should I do?

[prat33kg]

If you are using "pixel_format" as "yuyv", try changing it to "mjpeg" or the other way around. For me, it worked with the first method.

[nana400]

I have the same result as yours.. and when I have changed the "pixel_format" to "mjpeg" I've got this error..

[ERROR] [1547486033.596328143]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.631609438]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.666822355]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.694541910]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.729776569]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.779654260]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 any help please??

[TheLoneFedora]

I'm a Grad student who has taken over someone else's project with limited documentation. I'm very new to Ubuntu, GitHub, etc. Same problem. How do I change the pixel_format?

Nevermind. I figured out the answer to my question.

But I'm still having the same issues. Please let me know if you figure anything out.

[nana400]

Just go to the launch file and change the line from "<param name="pixel_format" value="yuyv" />" to "<param name="pixel_format" value="mjpeg" />"

On Mon, Jan 28, 2019 at 10:46 PM TheLoneFedora notifications@github.com wrote:

I'm a Grad student who has taken over someone else's project with limited documentation. I'm very new to Ubuntu, GitHub, etc. Same problem. How do I change the pixel_format?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/ros-drivers/usb_cam/issues/102#issuecomment-458294797, or mute the thread https://github.com/notifications/unsubscribe-auth/ApAGMmey3jPAls-KXo3jyzE3eq8M88hzks5vH2G7gaJpZM4XtbdI .

[TheLoneFedora]

Thank you nana400. First, I should have clarified my edit to my post. I did figure out where to change the pixel format. However, playing with that feature did not resolve the underlying green screen issues; I was having the same issues as the original poster, despite trying other pixel values.

[TheLoneFedora]

RESOLUTION: I did get past the green screen of death. For me at least it came down to 3 aspects of the launch file I was using. i) node name='usb_camera' ….> failed for some reason, but <node name='usb_cam' ….> does not. ii) is apparently trying to reference the laptop built-in camera. Changing to <… value="/dev/video0" /> is apparently the correct input for the Boson FLIR camera I am using iii) fails. But <… to="/usb_cam/image_raw"/> succeeds

I found these solutions once I figured out that another launch file on the computer usb_cam-test.launch was working. Trial-and-error ferreted out the problem code. I hope this helps your troubleshooting.

[QiHanY]

I have the same result as yours.. and when I have changed the "pixel_format" to "mjpeg" I've got this error..

[ERROR] [1547486033.596328143]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.631609438]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.666822355]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.694541910]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.729776569]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 [ERROR] [1547486033.779654260]: outbuf size mismatch. pic_size: 460800 bufsize: 614400 any help please??

hello ? I meet the same problems ,do you have any answer?

[Adharshmahesh]

Hi, I have the exact same problems. Is there any solution to this?

[twdragon]

Closed as a parameter setup issue mentioning here: http://wiki.ros.org/action/edit/usb_cam/Troubleshooting