Multithreaded 8/16-bit PNG sequence saver for ComfyUI. Encodes the frames
of a batch in parallel (PyAV releases the GIL during compression), giving a
large speedup over the built-in Save Image (Advanced) node for video/frame
dumps with byte-identical output. Embeds prompt/workflow metadata in the
first frame only by default.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
