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.
Have you met a issue that you can't cast some MKV to Chromecast? MKV is a video container which can hold many video and audio codec. usually, Chromecast can support MKV with H.264 video codec or aac audio codec, if your MKV codec is H.265 video codec or ac3/dts audio codec, Chromecast will refuse it. So the best way is to convert MKV to Chromecast supported video formats, then you can cast video tom Chromecast smoothly.
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.