[gst-embedded] Can v4l2src with caps=image/jpeg ?

[dongmei zhou]

hi All,

  I  check  the media type that  V4l2src supports  with gst-inspect and it
shows it can support pads: image/jpeg
while when I try that

   gst-launch  v4l2src ! image/jpeg
width=640,height=480,bpp=24,depth=24,framerate=15/1 ! jpegdec ! xvimagesink
  it shows:
   Error : from element pipeline0/v2l2src0: could not negotiate format
  .....
  check your filtered caps,

  I don't know the reason, Any  tips will be appreciated!
  thanks in advance!
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