Setting the profile level for libx265 using ffmpeg

While I don't know about setting the profile with ffmpeg, this is the x265 CLI code when setting the profile to main still picture :

param->maxNumReferences = 1;

/* The bitstream shall contain only one picture (we do not enforce this) */
/* just in case the user gives us more than one picture: */
param->keyframeMax = 1;
param->bOpenGOP = 0;
param->bRepeatHeaders = 1;
param->lookaheadDepth = 0;
param->bframes = 0;
param->scenecutThreshold = 0;
param->bFrameAdaptive = 0;
param->rc.cuTree = 0;
param->bEnableWeightedPred = 0;
param->bEnableWeightedBiPred = 0

So you can probably do something like this :

ffmpeg -f rawvideo -vcodec rawvideo -s 3840x2160 -r 30 -pix_fmt yuv420p -i <input_filename> -c:v libx265 -b:v 45000k -preset veryslow -x265-params keyint=1:ref=1:no-open-gop=1:weightp=0:weightb=0:cutree=0:rc-lookahead=0:bframes=0:scenecut=0:b-adapt=0:repeat-headers=1 <output_filename>