debuging androidmedia jpeg decoder in gst-remote-launch

[rrazavi]

I'm trying to use hardware jpeg decoder on my amlogic s912 device using
androidmedia plugin in gstreamer.
I'm using gst-launch-remote, and I could send a pipeline like this :
filesrc location=/mnt/sdcard/Movies/grill-mjpeg.mov ! qtdemux ! jpegparse !
jpegdec ! glimagesink
also playing back H264 file using amcviddec-omxamlogicavcdecoderawesome
plugin was fine.
once I replaced jpegdec with amcviddec-omxamlogicmjpegdecoderawesome I was
getting error about that it can not connect qtdemux to it and after looking
at logs I figured out this decoder(also other jpeg decoders in some Android
devices like RK3288) support video/mjpeg mime type which is not supported in
gstreamer.
after that I added some extra code in gstamc.c to change this mime type to
image/jpeg and compiled the gstreamer SDK.
So after that I'm not getting connecting element error but once I ask to
play I get internal stream error from qtdemux, so I assume still something
else is going wrong in caps negotiation or somewhere else.

1. How can I get all debugging outputs of an individual element while
running gst-remote-launch(I did try setting GST_DEBUG envirounment in
JNI_OnLoad and it did not work)

2. Is there any better known way to use Jpeg hardware decoder in android
using gstreamer

3. I should mention using runtime commands like gst-inspect or launch from
shell in android is not possible for me as it can not load androidmedia
plugin due to some Java machine environment that it needs, If there is a way
to make androidmedia work from command line that also would help



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