Fix the error "Starting the output failed. Please check the log for details". This fix works for me. On the web exist many ways to fix it. The best option is to go to the official discord of OBS Studio.
I have been streaming on Twitch for some time. And, whenever I will start the OBS since I'm using Arch Linux, it is like a surprise box. Every new try to stream can be displayed a new error.
This is not a criticism, this is the price of using an amazing open-source system like Linux.
To pay back the work of many people for this open-sourced tool, every time I face a new error and find how to fix it, I need to share the fix and kept improving the Learn in Public.
Probably, if you are facing this problem on Arch Linux, it is because a new version of the lib was shipped and the lib needs to be built again.
I'm using the
obs-studio-git 27.0.0.rc6.r0.g6792e9c1c-1 and being helped by the people from OBS discord, my fix, simply, was to reinstall the same lib again.
yay -S obs-studio-git
Doing this, the lib was rebuild and the transmission starts to works normally again.
A tip from the user
On ArchLinux if a library receives a major update most of the package built against are rebuilt and for AUR package users need to rebuild it themself
If you find another way to fix this, please, share it in the comments.