Personally, the key is the packaging format and separator of Blu-ray and the audio-video decoder.
The most formal Blu-ray movies are packaged in m2ts format. A file contains both audio and video. A separator is needed to separate the audio and video, and then it is decoded by different decoders, and then sent to the graphics card and sound card for output. Only when these three devices cooperate perfectly can a movie be played perfectly. If one of them is slightly deviated, the sound and picture will be out of sync. What if my source code is output to the amplifier? That is to say, the source data without separation and decoding is handed over to the power amplifier for processing, and the professional hardware processing ability is of course better than that of multiple softwares working together.
Bdrip is a blue light format with lossy compression. First, its file size will be much smaller. Secondly, the packaging format will no longer be m2ts, but may be ts or mkv. After lossy compression, the audio and video streams will be greatly reduced, reducing the working pressure of the separation decoder. If it is packaged in mkv format, there is no need for separator at all, because mkv is actually a container, which can store audio and video separately and then package them. Although you only see a file, you can actually see independent video files and audio tracks after opening it with special software.
Compare the files in your hand if you don't believe me. Is there such a difference? The simplest solution is to play movies with tmt5.