i wonder how you had previously used the PPA in wheezy, maybe the old PPA wasn't setup like the new official one is where it has Distro control.
If you read the error of course your command won't work because you aren't running ubuntu trusty tahr. the ppa is only setup to provide obs-studio for Ubuntu 14.04.
Someone correct me if i'm wrong though.
You could always just compile it yourself, the install instructions are easy IMO. They would go something like the following
Code:
git clone https://github.com/jp9000/obs-studio.git
Ensure you have a recent version of ffmpeg. Also ensure you have all the dependencies installed (note the names may be slightly diffferent in wheezy)
Code:
cmake libpulse-dev qtbase5-dev libqt5x11extras5-dev libavcodec-dev
libavformat-dev libswscale-dev libx264-dev libswresample-dev
libfdk-aac-dev libxinerama-dev libxcomposite-dev libxrandr-dev
and you need to decide if you want to do a portable install or a full system install. Once you make that decision the instructions to configure/compile and install it are located in the INSTALL file in the obs-studio folder that was created when you git cloned above.
Good luck
Alternatively there's this thread:
https://obsproject.com/forum/threads/compiling-and-installing-in-debian.17864/