"how to convert raw bgra image to jpg using gstreamer 1.0?" Code Answer

solved! the 2 major issues i faced were:

dump.bin was a symlink on my system (cygwin) and for some reason gst-launch-1.0 was unable to work with it;
when working with raw data, one must specify the blocksize for filesrc.

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gst-launch-1.0.exe -v filesrc location=dumped.bin blocksize=1920000 ! video/x-raw,format=bgra,width=800,height=600,framerate=1/1 ! videoconvert ! video/x-raw,format=rgb,framerate=1/1 ! jpegenc ! filesink location=out.jpg

on this specific case i also needed to flip the image vertically because it was captured from the opengl framebuffer of a 3d application:

gst-launch-1.0.exe -v filesrc location=dumped.bin blocksize=1920000 ! video/x-raw,format=bgra,width=800,height=600,framerate=1/1 ! videoconvert ! video/x-raw,format=rgb,framerate=1/1 ! videoflip method=vertical-flip ! jpegenc ! filesink location=out.jpg

By Luke Kroon on September 20 2022