cheap webcam from tesco corp PJPG pixel format

cheap ball webcam from tesco corps:
works with "cheese" fails with latest "ffmpeg", "v4l2" in theory supports it.

( Linux 3.4.0-rc7-rt7 )

# v4l2-ctl --all -d /dev/video1
Driver Info (not using libv4l2):
	Driver name   : gspca_pac7302
	Card type     : USB Camera (093a:262a)
	Bus info      : usb-0000:00:10.1-2
	Driver version: 3.4.0
	Capabilities  : 0x05000001
		Video Capture
		Read/Write
		Streaming
Format Video Capture:
	Width/Height  : 640/480
	Pixel Format  : 'PJPG'
	Field         : None
	Bytes per Line: 640
	Size Image    : 115790
	Colorspace    : JPEG (JFIF/ITU601)
Video input : 0 (gspca_pac7302: ok)
Streaming Parameters Video Capture:
	Frames per second: invalid (0/0)
	Read buffers     : 2