If you have downloaded KITTI MOTS, you will find it is easy to do so in three steps.
put all images to a folder named 'images'.
put all corresponding pixel-wise PNG instance annotations (each instance has a unique ID) to a folder named 'instances'.
3.create the '.segmap' which represents the train/val/test split. Please refer to mots_tools
If you have downloaded KITTI MOTS, you will find it is easy to do so in three steps.