Cheese 2.26.0 
Probing devices with HAL...
Found device 5986:0102, getting capabilities...
Detected v4l2 device: Acer Crystal Eye webcam
Driver: uvcvideo, version: 256
Capabilities: 0x04000001

Probing supported video formats...
Device: Acer Crystal Eye webcam (/dev/video0)
video/x-raw-yuv 640 x 480 num_framerates 3
30/1 15/1 10/1 video/x-raw-yuv 352 x 288 num_framerates 3
30/1 15/1 10/1 video/x-raw-yuv 320 x 240 num_framerates 3
30/1 15/1 10/1 video/x-raw-yuv 176 x 144 num_framerates 3
30/1 15/1 10/1 video/x-raw-yuv 160 x 120 num_framerates 3
30/1 15/1 10/1 video/x-raw-yuv 640 x 480 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 352 x 288 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 320 x 240 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 176 x 144 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 160 x 120 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 640 x 480 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 352 x 288 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 320 x 240 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 176 x 144 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-yuv 160 x 120 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 640 x 480 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 352 x 288 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 320 x 240 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 176 x 144 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 160 x 120 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 640 x 480 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 352 x 288 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 320 x 240 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 176 x 144 num_framerates 3
30/1 15/1 10/1 already added, skipping
video/x-raw-rgb 160 x 120 num_framerates 3
30/1 15/1 10/1 already added, skipping

v4l2src name=video_source device=/dev/video0 ! capsfilter name=capsfilter caps=video/x-raw-rgb,width=640,height=480,framerate=30/1;video/x-raw-yuv,width=640,height=480,framerate=30/1 ! identity