Why MiniMax H3 videos run long: the frames % 17 == 5 grid, explained
bennash · x · 2026-09-07
bennash explains why MiniMax H3 (Hailuo) returns slightly longer clips than requested: the model runs at 24 fps but only allows frame counts where frames % 17 == 5 (5, 22, … 124, 243, 362). Exact-second counts (120/240/360 frames) are illegal, so the pipeline snaps up: 5s→5.167s, 10s→10.125s, 15s→15.083s. The API only takes an integer duration 5–15 with no frame-count parameter; the same snapping occurs on fal, Hailuo, and local weights, so for exactly 5.000s you must trim after download.
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