Reduce the size of a video
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4
Finding the unique RGB values in a numpy array (useful for working with semantic segmentation masks):
np.unique(img.reshape(-1, img.shape[2]), axis=0) ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4
np.unique(img.reshape(-1, img.shape[2]), axis=0)