terminal - How to take snapshot in vlc using command line in ubuntu -

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i using easycap dc60+ in ubuntu , watch easycap video on vlc using following command:

vlc -vvv v4l2:///dev/video1:input=1:norm=pal-i:width=720:height=576 --input-slave=alsa://plughw:1,0 --v4l2-standard=pal_i

and want take snapshot of vlc using command line.

i use command on terminal show error , first instance of vlc not work 

vlc -i dummy v4l2:///dev/video0 --video-filter scene --no-audio --scene-path /home/stoppal/test --scene-prefix image_prefix --scene-format png vlc://quit --run-time=1

this error occure

[0x19d6aa8] dummy interface: using dummy interface module... libv4l2: error set_fmt gave different result try_fmt!

maybe @ page

https://wiki.videolan.org/how_to_create_thumbnails/


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