Hey I just wanted to report this and see if anyone else is running into this issue. But when I render a video out of sequencer at 5120 x 2141 (which is a 2.39 aspect ratio), I get black bars at the bottom of the video render… Any idea why this is happening? I am not getting this issue when I use the regular Render Movie Settings option in sequencer.
I was able to reproduce the issue and have logged a bug for it to be fixed in a future version. If you wish to investigate it yourself I suspect the issue is in the FImageOverlappedAccumulator (MovieRenderOverlappedImage.h) implementation. This takes each tile that is rendered for the high resolution screenshot and accumulates it together in its final location.