Near-static videos are the dominant GPU load: sampled into up to 64 frames, each
re-runs the whole detect→CCIP→SigLIP chain on ~identical content. Add a CPU
perceptual-hash frame dedup upstream of the GPU so the redundant frames are never
processed at all (not just their embeds).
- media.dedupe_frames() + _dhash(): 8×8 difference-hash (64-bit) per frame; greedy
keep — a frame survives only if its hash differs from every kept frame by
>= min_distance bits (Hamming). A static run collapses to one frame; genuinely
distinct scenes all survive. Order + frame_time preserved.
- Called in worker._download_decode right after sample_frames, so it runs in the
decode stage on the downloader thread (CPU) — the GPU consumers only ever see
deduped frames, and buffered video items shrink (less RAM too).
- Env-tunable FRAME_DEDUPE_DISTANCE (default 8; higher keeps more frames for brief
localized changes an 8×8 hash can miss; 0 disables). Logs `video frames N→M`
when it drops any, so video load reduction is visible.
Complements the spatial per-frame crop dedup (2026-07-01.2); this is the temporal
axis. Build marker 2026-07-01.3.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa
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