ROI-based encoding with CBR/CQP mode #892
Description
A typical video conferencing app may perform video segmentation and apply background replacement or blur, then encode.
If the segmentation mask can be delivered to WebCodecs as the input for ROI-based encoding, encoder can apply improved QP to regions that is not masked, while consuming less bits on masked regions.
For use cases that background image is not user-self-uploaded image, or the background is blurred, delivering the mask end-to-end with such kind of encoding, will help to reduce bandwidth, while not having visual quality impact.
For sending masks in-band, MPEG annotated-region SEI could be an option.