The previous system prompt asked GLM for a free-form "shot-by-shot" expansion,
which reliably produced 4-5 fake cuts with timestamps running out to 8-10s —
impossible for a clip fixed at ~5s (H3_GEN_PARAMS.frames / FPS). Rewrote it
against docs/h3skill.md (MiniMax's own H3 prompt-writing methodology, added
alongside this commit): every chat prompt has no reference images, so it's
always T2VA mode, and at ~5s it's one continuous shot, never a montage.
The new prompt asks for H3's actual three-field T2VA structure
(integrated_multimodal_description / overall_soundscape / non_diegetic_music,
fixed order and labels), a single dominant camera movement from the official
vocabulary (type + amplitude + speed), concrete lighting (no hollow buzzwords
like "8K"/"cinematic" alone), and — previously missing entirely — explicit
sound design. Verified against the real GLM endpoint on several sample
prompts: single continuous shot throughout, correct field structure, no more
impossible multi-shot timestamps.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0144MiJ2cLjMd9jWaeEpVfUJ
