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1abab1d81e
Bria's /remove_background endpoint accepts background_color='Transparent' when paired with an alpha-capable container/codec; pass output_container_and_codec= 'webm_vp9' in that case (otherwise mp4_h264, unchanged). The returned WebM flows through ComfyUI's VIDEO type as a file reference, so Save Video with the default auto/auto settings stream-copies it byte-for-byte with the alpha plane intact (covered by new test_save_to_auto_preserves_vp9_alpha_via_stream_copy). BriaTransparentVideoBackground is kept as-is because it remains the supported path for the IMAGE+MASK workflow: Get Video Components currently cannot expose alpha for VP9 streams (PyAV's default vp9 decoder drops the side alpha layer), so the per-frame compositing workflow still needs the dedicated node that decodes via libvpx-vp9 itself.
Pytest Unit Tests
Install test dependencies
pip install -r tests-unit/requirements.txt
Run tests
pytest tests-unit/