Not totally sure about how ffmpeg handles it, but normal x264 only respects buffersize&co if profile&level are set. You only specified the profile.
You probably might want to read up on vbv restrictions and read up on ffmpegs 'x264-params' instead of using maxrate and bufsize. The vbv readup is needed, so that you understand what that max bit rate really is meant to do, since it does not set an absolute maximum bit rate.
'opencl=true' <- is probably a bad idea if it enables the opencl support in x264, since the opencl support in x264 isn't really useful and sometimes even harmful.
You probably might want to read up on vbv restrictions and read up on ffmpegs 'x264-params' instead of using maxrate and bufsize. The vbv readup is needed, so that you understand what that max bit rate really is meant to do, since it does not set an absolute maximum bit rate.
'opencl=true' <- is probably a bad idea if it enables the opencl support in x264, since the opencl support in x264 isn't really useful and sometimes even harmful.
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.