2b) test with gstreamer-properties (before set to use v4l, then v4l2):

$ sudo gstreamer-properties 
gstreamer-properties-Message: Error running pipeline 'Video for Linux (v4l)': 
Impossibile impostare o ottenere le impostazioni dalla risorsa. 
[v4l_calls.c(409): gst_v4l_set_chan_norm (): /pipeline0/v4lsrc3:
Error setting the channel/norm settings: Argomento non valido]
gstreamer-properties-Message: Error running pipeline 'Video for Linux 2 
(v4l2)': Impossibile ottenere dei buffer dal device «/dev/video0». 
[v4l2src_calls.c(1025): gst_v4l2src_capture_init (): /pipeline1/v4l2src2:
error requesting 0 buffers: Impossibile allocare memoria]

[sorry for non-english output, respectivly should mean: "non valid
argument" and "cannot allocate memory"]

-- 
linux-uvc and v4l don't work with Chicony webcam
https://bugs.launchpad.net/bugs/140680
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