cinemasetfree.comDuration
Also known as: duration
Duration controls the length of generated video clips in seconds. Shorter durations are faster to generate and cost fewer credits. Longer durations allow for more complex motion and scene development but increase generation time and may reduce per-frame quality.
What It Does
Video generation models produce a fixed number of frames based on the duration and frame rate settings. A 2-second clip at 24 FPS generates 48 frames; a 10-second clip generates 240 frames. The model must maintain temporal coherence across all frames — subjects should move smoothly, lighting should remain consistent, and the scene should evolve naturally.
Longer durations are significantly more demanding on the model. With more frames to generate, there's more opportunity for temporal artifacts like flickering, morphing, or inconsistent motion. Current video models handle short clips (2–5 seconds) reliably, while longer clips (8–10+ seconds) may show quality degradation. For longer sequences, it's often better to generate multiple short clips and stitch them together.
Value Ranges
Short (2–3 seconds)
Quick, high-quality clips. Ideal for reaction shots, loops, and motion tests. Fastest generation and lowest credit cost.
Medium (4–6 seconds)
Room for simple actions and camera moves. Good balance of duration and quality for most storyboard uses.
Long (7–10+ seconds)
Full scene development. Complex actions possible but temporal consistency may degrade. Higher credit cost.
Visual Comparison
Video pending
duration = 2s
Video pending
duration = 5s
Video pending
duration = 10s
Tips
- Start with 2–3 seconds to test your prompt before generating longer clips.
- Most storyboard panels only need 2–4 seconds to convey the action.
- If a long clip shows flickering or morphing, try breaking it into multiple shorter clips.
- Duration directly impacts credit cost — a 10-second clip may cost 3–5× more than a 2-second one.