using filesink to store a single frame from mjpeg stream

[prkhr4u]

I want to take a single snapshot from mjpeg stream and I am trying to save it
to bmp file like this:

gst-launch-0.10 souphttpsrc location="http://192.168.1.12/video2.mjpg" !
jpegdec ! ffmpegcolorspace ! ffenc_bmp ! filesink location="abc.bmp"

But what is happening is that it is storing the full stream in a single file
and the size keeps on increasing.

I want to use something like this:

gst-launch v4l2src num-buffers=1 ! jpegenc ! filesink location=capture1.jpeg

But unfortunately, the option 'num-buffers' is not available for
souphttpsrc. 
How to take only 1 frame/snapshot from mjpeg stream??



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