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Some (bad idea) to solve your problem :

1. try to allocate buffer before call std::vector<uchar> buf(50000);

2. use color image

   vector<mat> x; x.push_back(image);x.push_back(image);x.push_back(image); merge (x,y); imencode(".jpg", y, buf);

good idea update to opencv 3.2

in github I can not find update in 2.4.12 to 2.4.13.2 Can you give stack trace?

my dll in debug mode is C:\Windows\System32\ucrtbased.dll