TeamTalk v5.7 for macOS unfortunately has compatibility issues with macOS X. At the moment it seems TeamTalk v5.7 will only run on macOS 11.
Download TeamTalk v5.6.2 if you still use macOS 10.
The issue is described here.
TeamTalk v5.7 compatibility issue on macOS 10
Could you implement streaming from the video platforms such as youtube? My idea is to paste a youtube link in the stream edit box and tt would be able to stream the file. I’m willing to test it.