Asking Sequencer for a 7680x982 resolution image combined with setting the screen percentage at 400% is going to cause the engine to try and allocate a 30,720x3,928 texture internally. Most graphics cards have a maximum texture resolution of 16k on the longest dimension, so I am not sure how this would have worked in any case.
You are going to need to find another method of producing such a high resolution render for the time being (such as building your own output rendering that renders many samples with a small offset and adds them together) or a system that uses off-center camera projection matrices to render sub-regions of the screen (which will cause issues with post processing effects), or wait until a better movie rendering solution is released.