Lossless end-to-end 16-bit grayscale compression?

[Ryan Talbot]

Hi list,

I'm trying to losslessy compress the output of the disparity plugin.  Its source caps say it outputs RGB, but the algorithm itself is supposed to generate 16-bit grayscale.  After a lot of headache, I finally found a combo of avenc_ljpeg and avdec_mjpeg that would work to encode and then decode the RGB stream and get the exact same data on both ends.  Now, I would like to do the same for a 16-bit grayscale stream of images, but am having little luck.  avenc_mjpeg does support GRAY16_BE/LE, but I don't know how to make it lossless.

Does such a solution exist, or do we need to roll our own/modify a codec?

Thanks,
Ryan Talbot
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