[verall]

There is nothing special about this shade of green that causes it to come from a codec issue. This green is what you get when you convert a 0-buffer from YUV to RGB. Depending on what colorspace you convert with it will be a slightly different shade.

You can play around with this yourself in imagemagick:

    dd if=/dev/zero of=zero.yuv bs=480 count=240
    convert -depth 8 -size 320x240 yuv:zero.yuv green.png

Conversion from YUV to RGB will be at one of the last steps of the image capture pipeline. Anything in between could wipe the buffer to 0s. It could be due to a simple bug in the image pipeline or it could be censorship. It tells you nothing.