Virtues of Recycling in Multi-rate Encoding
summary
Claims a practical method to double x265 encoding speed by reusing motion vectors and quadtree structure from lower-resolution or higher-bitrate encodes, then applying limited refinement (skip/merge checks or selective motion search). Implementation is integrated into x265 v2.7+ and reports up to 250% speed‑ups on higher resolutions with negligible quality change, at the cost of increased end-to-end latency and reduced parallelism; applicable to any motion‑compensated codec and useful for multi-rate multi-resolution encode ladders.
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chapters (7)
- 0:00Introduction
- 0:56Motivation
- 2:05Solution: Recycling Encoder Decisions
- 3:16Refining scaled information WHY REFINE
- 5:38Twice the speed, no quality loss
- 6:47Encode graphs EXAMPLE
- 8:56Summary ANALYSIS REUSE
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