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JamesandClaude Opus 4.7
e79a8faa42
Previously, plan() defaulted chunkSize to 240 on a `?? DEFAULT_CHUNK_SIZE` line, so a 660-frame composition with maxParallelChunks=16 ended up at 3 chunks (ceil(660/240)) regardless of the caller's fan-out intent. When config.chunkSize is undefined, auto-size from maxParallelChunks: effectiveChunkSize = max(MIN_CHUNK_SIZE, ceil(totalFrames / maxParallelChunks)) MIN_CHUNK_SIZE=10 keeps per-chunk fixed overhead from swamping the parallelism gain on tiny renders. Explicit numbers, including 240, take precedence over the auto-sizer — no behavior change for callers that set chunkSize explicitly. Surfaced by the lever-1 chunk-scaling benchmark on 2026-05-17. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>