I know I could be feeding a movie file to the Compositor, but then it would take 2 steps (1. render video with color correction from VSE, 2. feed it to the Compositor to rotate it -90 degrees and render the result.)
So I am trying to feed the Compositor with a render layer instead. But it's not working. I have both Compositor and Sequencer check-marked in Post Processing in the Render tab. Is there something wrong with the nodes, or something else?