Primer is a WIP Binpack to Bulletformat parser based on the Stockfish parsing code.
Primer can filter your data for you as it parses the binpack. Currently it filters positions where the best move is a capture and positions where stm is in check by default. It also offers several optional filtering options:
Disables the default filtering of positions where the best move is a capture.
Disables the default filtering of positions where stm is in check.
Filters all positions with a abs(score) > max_score.
Filters all the positions with a ply count < minimum_ply_count
Filters positions in a won game (from stm pov) with a score < win_filter_score.
Filters positions in a lost game (from stm pov) with a score > loss_filter_score.
Stops after having parsed max_pos_count positions, filtered positions don't count towards the total.
Here's an example of a basic Primer command
./primer convert binpackname.binpack desiredbinname.bin --max-score 10000