The annotations are in .mat format (Matlab Matrix) which is not accepted by Yolov4 Darknet. Moreover, the annotations for a image is available in the following format: bbox_x1: Min x-value of the ...

JHMDBReadAnnotation Convert the Matlab annotation of JHMDB dataset (stored as .mat) to YAML and read it as OpenCV cv::Mat in C++. The JHMDB dataset provides annotations in .mat files ...