The demo version of "Touhou Gensou Mahjong" has been updated to v1.2.3.
NDI (Network Device Interface) is a protocol for transmitting video and audio via LAN. If there are compatible devices or applications, they can exchange video and audio sources with each other via LAN.
The client can generate video for live relay separately from the video viewed by the players and send it to a broadcasting tool (such as OBS Studio) that supports the NDI protocol.
Before now(include Switch version), it was very time-consuming to prepare a dedicated client for watching the game, set up a room for stream, and then join the game with another client(and account) and so on. With this feature, it is now possible to output video for watching the game and play at the same time with only one PC and one account. This feature will allow you to simultaneously output video for spectators and play a game with minimum of only one PC and one account.
NDI-compatible software must be prepared.
D.N.A. Softwares has tested on OBS Studio with obs-ndi installed to check and debug.
Please refer to each site for how to install the software.

In the "Advanced Settings" menu under "My Page" and "Settings", there is an item titled "NDI". When "ON" is selected, a 4-digit number is displayed, which is used to identify the source.

*Screenshots are from OBS Studio + obs_ndi
After turning it on, search for the source in an application that can receive NDI and you will find "thmj-xxxx" (xxxx is a 4-digit number). Note that when you are not playing a game, a dedicated single fixed picture is displayed; if you start a game(whether you are playing against the CPU or online), you will see the relay screen.
For now, the function is simply to look down on the table from directly above, but we hope to add more features that are useful to streamers, etc., while ensuring fairness in the game. If you have any comments, requests, suggestions, etc. (even if it is difficult to implement all of them), please write them on the forum. We appreciate your comments and suggestions.
Thank you for your continued support of "Touhou Gensou Mahjong".