SDL Renderer/VLC.

Hi, I have SDL/LibVLC working and compiling in mingw64.
However, I want to render 2 videos.
LibVLC renders into a texture. I made 2 threads and use a mutex.
Each thread locks/unlocks the texture. Does 2 frames and then freezes.
I want to render multiple videos into the same full screen window.
Any suggestions or better strategies?