Makes a video larger and sharper with the FlashVSR v1.1 model, from 1x to
4x. The model, the loop and the tiling are the pack's own code in plain
PyTorch, so the node needs one model file and no other pack. A long clip
needs no more graphics memory than a short one, and a result too large for
the free memory is made in tiles.
Comes with a help page, the example workflow FlashVSR Video Upscale, and
tests for the helpers.