I have audio and the status bar says it's playing at 60 FPS, but no video ever shows up. How big a video are we talking? EDIT - I see video in the right column

I have audio and the status bar says it's playing at 60 FPS, but no video ever shows up. How big a video are we talking? EDIT - I see video in the right column which I assume is an input channel. But the shader shows an error on line 283: 'tanh' : no matching overloaded function found