How to make an AI short film with Kling 4.0: tests and workflow

Introduction: Kling 4 Enters the Filmmaking Workflow

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With the release of Kling 4 on its official platform, filmmakers working in generative video face a fresh choice. Evaluating whether this new model can rival high-end alternatives like Seedance 2.5 is essential, especially given that Kling 4 is significantly more budget-friendly.

To determine whether Kling 4 is robust enough to power narrative projects, tests were run across several demanding creative scenarios: character replacement, fluid physics, nuanced dramatic dialogue, and multi-keyframe sequence building.

Character Replacement and In-Video Editing

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One of Kling 4's headline capabilities is video editing via character swapping. In a challenging test using an unreleased shot featuring complex camera moves, an environment made of waste piles, and a character crawling through muddy water, the model was tasked with swapping the subject using an external character reference sheet.

The resulting video preserved intricate camera movement and physical timing remarkably well. While the color grading between the new subject and the preexisting environment required slight post-generation tweaking, the motion fidelity and water interactions around the crawling character matched the original plate with high precision.

Handling Water Dynamics and Underwater Physics

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Simulating realistic fluids has long been an obstacle for AI video generators. A test prompt featuring a human swimmer navigating submerged structures alongside wildlife put Kling 4's environmental physics to work.

The generated 15-second clip displayed impressive secondary motion, capturing floating hair, fabric drifting through the water, micro-bubbles, and believable lighting attenuation. The execution proves Kling 4 can realistically depict underwater scenes without collapsing into artifacts.

Dramatic Acting and Dialogue: Kling 4 vs. Seedance 2.5

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Filmmakers rely heavily on dramatic performances, requiring fine control over emotional beats, pauses, and speech delivery. Kling 4 was tested against Seedance 2.5 across both understated dialogue and an intense, heated monologue inspired by dramatic cinema.

In terms of facial performance and silent emotional expression, Kling 4 performed admirably. However, Seedance 2.5 retained a distinct advantage in speech realism: Kling 4 exhibited slightly disjointed lip synchronization and vocal audio that sounded disconnected from the scene's ambient acoustics.

Building Scenes with Multi-Keyframe Sequences

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Kling 4 supports narrative generation utilizing up to 10 sequential keyframes, opening up the ability to script a continuous 30-second scene without relying on traditional frame-by-frame cuts.

When keyframing an eight-shot sea-monster encounter, the model excelled when transitioning between contrasting camera angles, such as wide establishing shots cutting to close-ups. However, providing keyframes with overly similar framing led to awkward interpolation and pacing slowdowns, demonstrating that varied shot choices produce superior results.

Final Thoughts

While Seedance 2.5 maintains an edge in vocal delivery and refined dialogue execution, Kling 4 establishes itself as a capable filmmaking tool with standout character replacement and solid physical simulations.

Given its significantly lower cost per generation, Kling 4 offers an accessible platform for narrative iteration, making it an attractive choice for indie AI filmmakers willing to handle audio design and dialogue editing separately.