[PDF][PDF] Encoding, fast and slow:{Low-Latency} video processing using thousands of tiny threads
14th USENIX Symposium on Networked Systems Design and Implementation (NSDI 17), 2017•usenix.org
… ExCamera is designed to achieve low latency with finegrained parallelism. Our encoder
reflects one key insight: that the work of video encoding can be divided into fast and slow
parts, with the “slow” work done in parallel across thousands of tiny threads, and only “fast”
work done serially. The slower the per-frame processing—eg, for pipelines that use 4K or
8K frames or sophisticated video compression, or that run a computer-vision analysis on
each frame—the more favorable the case for finegrained parallelism and for our approach …
reflects one key insight: that the work of video encoding can be divided into fast and slow
parts, with the “slow” work done in parallel across thousands of tiny threads, and only “fast”
work done serially. The slower the per-frame processing—eg, for pipelines that use 4K or
8K frames or sophisticated video compression, or that run a computer-vision analysis on
each frame—the more favorable the case for finegrained parallelism and for our approach …
Abstract
We describe ExCamera, a system that can edit, transform, and encode a video, including 4K and VR material, with low latency. The system makes two major contributions.
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