I ported Google Camera to the Cosmo Communicator, which has a "24MP" Quad Bayer sensor (as advertised). My work can be found in the OESF forum. The stock camera app produces horrific interpolated 24MP images with smudged detail, no shadow detail, and often burnt or washed-out colors. GCam produces a clean 6MP RAW image with high detail (for a 6MP sensor) and accurate colors, and 6MP JPEG images of similar high quality. The sensor definitely performs better in low light than conventional Bayer sensors of even higher resolution (for cell phones and tiny pocket cameras). So in my experience, the advertised 4x resolution of Quad Bayer sensors is just a marketing gimmick, but you do get better low light performance.
I tested my GCam port on my new Pro1 X and was able to take RAW photos. The sensor reports its resolution as 12MP, not 48MP, whereas the Cosmo reported 24MP and needed fixes in the GCam code since the RAW image came out filling only 1/4 (6MP) of a 24MP image with the rest black. Therefore, my port worked on the Pro1 X without modification, at least for photos (video crashes). And like the OP, I could not get OpenCamera to save a RAW image. It would just freeze.
It might be worth trying the GCam port that popped up a couple years ago for the original Pro1. I don't expect to do any work on my port because the Pro1 X's cellular, Wi-Fi, and GPS reception is utterly abysmal, forcing me to shelve the thing. What a disappointment.
Pro¹ X camera issues?
in Bug Reports
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I ported Google Camera to the Cosmo Communicator, which has a "24MP" Quad Bayer sensor (as advertised). My work can be found in the OESF forum. The stock camera app produces horrific interpolated 24MP images with smudged detail, no shadow detail, and often burnt or washed-out colors. GCam produces a clean 6MP RAW image with high detail (for a 6MP sensor) and accurate colors, and 6MP JPEG images of similar high quality. The sensor definitely performs better in low light than conventional Bayer sensors of even higher resolution (for cell phones and tiny pocket cameras). So in my experience, the advertised 4x resolution of Quad Bayer sensors is just a marketing gimmick, but you do get better low light performance.
I tested my GCam port on my new Pro1 X and was able to take RAW photos. The sensor reports its resolution as 12MP, not 48MP, whereas the Cosmo reported 24MP and needed fixes in the GCam code since the RAW image came out filling only 1/4 (6MP) of a 24MP image with the rest black. Therefore, my port worked on the Pro1 X without modification, at least for photos (video crashes). And like the OP, I could not get OpenCamera to save a RAW image. It would just freeze.
It might be worth trying the GCam port that popped up a couple years ago for the original Pro1. I don't expect to do any work on my port because the Pro1 X's cellular, Wi-Fi, and GPS reception is utterly abysmal, forcing me to shelve the thing. What a disappointment.