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Found it!

In order to use rxbag (much more efficient than the extract_image node => did not extract all the images of my bags files) you have to :

1°) select with your mouse the length of your timeline

2°) play your bag file (let it run)

3°) select the view "image"

4°) click on the button on the right of the text "frame%04d.png"

5°) And here normaly pop's up an another window that offers you to save all the frames

Regards

Found it!

In order to use rxbag (much more efficient than the extract_image node => did not extract all the images of my bags files) you have to :

1°) select with your mouse the length of your timeline (a slightly cyan color show up as you select it)

2°) play your bag file (let it run)

3°) select the view "image"

4°) click on the button on the right of the text "frame%04d.png"

5°) And here normaly pop's up an another window that offers you to save all the frames

Regards