What is the difference between the original Blu-ray version and the remux format?

The original Blu-ray disc is a file directly copied from the blue disc. It has not been processed and retains the integrity of the BD disk, remux is lossless extraction of bluray-DVD and video and audio data in the HD-DVD, encapsulated into our familiar ts or AVI files. As a common download format, it is familiar to many HD enthusiasts. Although remux does not compress the original version, it is only re-encapsulated. However, during my long-term contact, I 'd like to discuss some differences with you.

1. audio and video data
In terms of video and audio, there is no difference between the original version and remux in theory, because the audio and video do not undergo any re-encoding. However, in order to solve the separation and playback problems during computer Decoding of New lattice audio, Blu-ray remux's tsmuxer does not support all the next generation audio formats, however, the decoder used for computer playback does not support all the next-generation audio formats, especially the truehd audio tracks. Therefore, remux often adopts a compromise to compress multiple audio tracks. Currently, high-definition players such as tvx and Yumai have implemented source code output for the next generation of audio. However, during the playback process, I found that the source code of remux can only output the core of dtshd truehd, that is to say, the sound effect can only reach 5.1, not the real next generation sound, while the Blu-ray source disk can realize the real next generation source code output. The problem is that the HD player has a problem with remux's next generation audio track support, or is there a problem with the remux format itself?

2. Timeline
When a player plays a remux film, it will find that the fast forward is inaccurate and cannot be used back. Some films may even encounter time recognition errors, there is no problem with the fast forward and fast return operations of the Blu-ray source disk. Why does the remux post-remux film have this problem? Is it a problem with the TS format or with the producer?