HunyuanVideo 1.5 Outputs Black Video: Only Certain Frame Lengths Render
Big-Maybe-2228 · reddit · 2026-09-17
A user running HunyuanVideo 1.5 480p I2V Step-Distilled FP8 with Qwen 2.5 VL 7B FP8 on an RTX 4050 6GB laptop via ComfyUI gets fully black videos for most frame lengths—only 25 frames and one other length produce visible output; an 81-frame run took 319s before failing.
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