(Noob here - be gentle with me) Difficult gstreamer pipeline - Decode/demux h264 file to jpeg on Windows using DirectShow

[Bo Lechnowsky]

I've been trying for days to get gstreamer's gst-launch-1.0 to output an 
h264 stream as individual jpegs, but want only one per second, and using 
the DirectShow hardware acceleration. I've tried numerous iterations of 
commands, and this is the closest I've gotten:

     gst-launch-1.0 filesrc location=test.h264 ! decodebin ! videorate ! 
video/x-raw,framerate=1/30 ! jpegenc ! multifilesink location=img%03d.jpg

This gives me 300 jpegs from my 10 second h264 stream, and it doesn't 
use the DirectShow hardware interface.

I've used gst-inspect to try to use what I thought was the DirectShow 
decoder for h264 (video/x-h264) but that gives me errors. I've also 
tried to change the framerate from 1/30 to 30/1 and 1/1, but always get 
the same 30 jpeg per second output.  Therefore, I'm assuming that 
framerate is a method for me to tell gst how many fps the source file is.

I thought decodebin was supposed to automatically select the best 
decoder based on the input stream, but it appears to be using a CPU 
intensive one (instead of GPU hardware-accelerated) judging by how the 
CPU on my test machine pegs at 100% for the duration of the gstreamer 
process.

Ideally, I'd also like the jpegs to be output at a different resolution 
than the resolution of the video, but everything I've tried 
(width=640,height=480) either causes errors or doesn't result in a 
resized jpg.

I know how to do all this with avconv, but it also is CPU intensive and 
I'm trying to free the CPU to perform other tasks during the decoding 
process.

My test system is older and has an ATI Radeon Xpress 1250 card in it and 
the system says it is running DirectX 9.0c. According to specs, the 
X1250 has DirectX 9 in hardware. I don't know when h264 decoding was 
added to DirectX, but I'd assume it was in well before DirectX 9.

I'd REALLY appreciate any help any of you gurus could provide!