multipartdemux: boundary specified manually but gst quits because "Boundary not found"

Submitted by Roman Gaufman

Description

I have a D-Link DCS-930L IP camera and when I get mjpeg from it, it looks something like this:

mjpg.cgi mjpg.cgi contents:

Content-length: 45536
Date: 10-04-2011 07:41:20 PM IO_00000000_PT_000_000
Content-type: image/jpeg
(jpeg data)
--video boundary--
Content-length: 45607
Date: 10-04-2011 07:41:20 PM IO_00000000_PT_000_000
Content-type: image/jpeg
(jpeg data)

So the boundary is "--video boundary--" - I try to specify this to gstreamer with:

multipartdemux boundary="--video boundary--"

Yet I still get the following whether I specify the boundary or not:

Boundary not found in the multipart header
ERROR: pipeline doesn't want to preroll.