TrueHD (Dolby Atmos) is a unique audio format for Blu-ray that cannot be used independently and must be paired with an AC3 audio stream. When using the transcoding mode (0x83) in Yuhan Blu-ray Creator and Yuhan 4K UHD Creator, if your file format is M2TS and already contains a TrueHD+AC3 audio stream, you can use it directly. However, if your file is in MP4 or MKV format, you will need to prepare two separate audio streams: one for TrueHD (Dolby Atmos) and one for AC3.

 

1. If your file is M2TS and it shows AC3 core+TRUE-HD+ATMOS in TSMuxer, you can use Transcode mode directly.

 

2.If your file is in MP4 or MKV format, you need to prepare an AC3 audio stream with 5.1 channels, 48000 Hz, and 640 kbps. You can use HandBrake or Yuhan Blu-ray Creator for audio encoding to generate the AC3 audio track, then merge this AC3 track into the MP4 or MKV file. In Yuhan Blu-ray Creator, you will see both a TrueHD track and an AC3 track. You only need to select the TrueHD audio track; there’s no need to select the AC3 track. Yuhan Blu-ray Creator will automatically combine the AC3 and TrueHD audio tracks into a single audio stream.

 

3.Set Transcode Mode and “Audio Copy”

 

 

How to retain TrueHD (Dolby Atmos) in Passthrough mode?

https://yuhanmedia.com/dvdcreator-faq/how-to-retain-truehd-dolby-atmos-in-passthrough-mode.html