Image conversion problem with image_view video_recorder

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Hello,

I am trying to directly record a video from an image topic using video_recorder from image_view. I am testing it with my laptop camera running

roslaunch usb_cam usb_cam-test.launch

When I launch the recording with

rosrun image_view video_recorder image:="/usb_cam/image_raw" _filename:="/home/user/video.avi"

I get the following error "Unable to convert rgb8 image to bgr8". I have also tryed using

rosrun image_view video_recorder image:="/usb_cam/image_raw" _filename:="/home/user/video.avi" _encoding:="rgb8"

but this produces "Unable to convert rgb8 image to rgb8".

The exact same happens for images published by the V-REP simulator (which is what I actually need to record in the end).

Any help would be very much appreciated. Thanks.

Riccardo