With supporting the most advanced hardware acceleration NVIDIA CUDA & AMD APP by H.264/H.265 codec, Pavtube Video Converter Ultimate can give users 30x video transcoding speed than before. With this fast H.265 encode, you can easily rip Blu-ray to H.265, copy DVD to H.265 and re-encode H.264 to H.265 quickly on your Windows PC.
If you much care about the picture quality and video size when ripping 4K Blu-ray, I would strongly recommend you to rip 4K Blu-ray to HEVC MKV because HEVC provides the best quality and smallest video size. However, HEVC encoding is CPU heavy and a standard 4K Blu-ray usually has two hours videos. So concerning about efficiency, I would strongly recommend using Nvidia's HEVC encoder to enhance the 4K Blu-ray to HEVC ripping speed. Here is the best HEVC NVIDIA Encoder for you to rip 4K Blu-ray.