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it seems the problem is not with the way the library is constructed (i.e. cmake's "Link Libraries: Dynamic load" does not mean that they are not statically loaded" ????) but rather a bug in ffmpeg causes opencv to crash on a raspberry pi: https://github.com/opencv/opencv/issues/10157

I guess there is some magic cmake incantation that removes ffmpeg from the link list and substitutes v2l4 instead...

it seems the problem is not with the way the library is constructed (i.e. cmake's "Link Libraries: Dynamic load" does not mean that they are not statically loaded" ????) but rather a bug in ffmpeg causes opencv to crash on a raspberry pi: https://github.com/opencv/opencv/issues/10157

I guess there is some magic cmake incantation that removes ffmpeg from the link list and substitutes v2l4 instead... yes, done that but I still get an unadorned segmentation fault.

I am giving up with opencv as it is packaged. My java skills are excellent, and my C skills are rusty, but I suspect I will have more success compiling the parts of opencv I want with gcc and then packaging them as I want them with JNI myself.