ComfyUI introduces a new BriaTransparentVideoBackground node that extracts video subjects with full transparency, replacing the previous solid-color background replacement approach, and updates the SaveWEBM node to preserve alpha channels when using VP9 codec.
Adds a dedicated Bria node that outputs a true transparent cut-out of the video subject instead of a flat MP4 with a solid background, and enables the SaveWEBM node to encode and save the alpha channel using the VP9 codec.
Video editors and content creators using ComfyUI workflows can now export videos with true transparent backgrounds, making it possible to composite AI-processed subjects directly onto other footage without manual masking or green-screen workarounds. The previous node only produced opaque MP4 files with a solid color fill. Watch whether the VP9 alpha encoding works reliably across different video lengths and resolutions, and whether downstream tools like DaVinci Resolve or After Effects correctly interpret the WEBM alpha channel.