VidIQ: Inference-Aware Neural Codecs for Quality-Enhanced, Real-Time Video Analytics

摘要

Video analytics pipelines migrating to edge deployments are facing performance bottlenecks under limited bandwidth. Non-uniform intra-frame encoding emerges to further compress pixels without affecting the output of the server deep neural network (DNN), while it is inefficient in high-resolution video streaming at low bandwidth. The detail enhancement capability of neural super-resolution (SR) permits resolution downsampling and aggressive compression on edge devices for low-latency transmission. To exploit its accuracy potential, DNN-oriented non-uniform encoding is expected to be additionally aware of SR models. However, traditional codecs struggle to cope with both quality optimization for SR and global semantic features for DNN. We advocate neural codecs for coordinated encoding and enhancement, enabling analytic-oriented video streaming with optimal accuracy-delay tradeoffs. Our system, VidIQ, achieves quality-enhanced real-time video analytics by 1) improving the network architecture of neural codecs (at two granularity) to integrate SR models into a DNN-oriented analytics pipeline, and 2) adapting the multi-scale encoder and SR-decoder to scene dynamics (i.e., content and bandwidth variations) with the help of the monolithic controller to hold a performance advantage. Extensive evaluations showcase that VidIQ reduces end-to-end delay by 35.8% and improves analytics accuracy by 21.2% compared to the recent video compression, enhancement, and streaming baselines.