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JamesandClaude Opus 4.7
2d6372ac2a
Part of Phase 2 of the distributed rendering plan (determinism hardening). See DISTRIBUTED-RENDERING-PLAN.md §7.1 and §17.2 (gating table). Adds two optional fields to EncoderOptions: lockGopForChunkConcat?: boolean // default false gopSize?: number // required when lockGopForChunkConcat=true When the flag is true on the SW libx264 / libx265 paths, buildEncoderArgs emits closed-GOP / forced-keyframe args so the resulting chunk file can be losslessly concatenated (`ffmpeg -f concat -c copy`) with sibling chunks: -g <gopSize> -keyint_min <gopSize> -sc_threshold 0 -force_key_frames "expr:eq(mod(n,<gopSize>),0)" -x264-params "...:scenecut=0:open-gop=0:repeat-headers=1" -x265-params "keyint=<gopSize>:min-keyint=<gopSize>:scenecut=0:open-gop=0:repeat-headers=1" -bf 0 (added for h265 too when locked) GPU encoders, vp9, and prores ignore the flag (their concat-copy story is separate — see plan §7.2 / §8). In-process behavior is unchanged: the default (false) path emits no new args. New unit tests pin both branches in packages/engine/src/services/ chunkEncoder.test.ts. This is part of a stack of 10 PRs; this is PR 1 of 10. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>