Kling V4.0 Text-to-Video: one prompt, one long shot, with sound
Kling V4.0 Text-to-Video makes clips of 3 to 30 seconds with stereo audio from a prompt alone. How to write a shot that holds, with prompts.
Most text to video models give you a few seconds and let you stitch. Kling V4.0 Text-to-Video is the one to open when you want the opposite: a single shot that keeps running. You can ask for anything from 3 up to 30 seconds, at 720p or 1080p, in four shapes including 21:9 ultrawide, and the clip comes back with synchronized stereo audio. No image to upload, no reference to prepare. Just words.
Why would you pick it?
Because of that length. A five second clip is a reaction; a twenty second clip can be a scene with a beginning, a turn and an ending, and that is a different kind of writing. It is also the model to choose when the sound matters and you do not want a second tool: footsteps, wind, a crowd and a line of music arrive in the same file. If you only need a quick animated loop, a shorter model is cheaper; the video model comparison helps you decide.
Write the shot like a one-take director
A long clip fails in a particular way: the model has time to wander. The cure is to tell it where the shot starts, what moves, and where it ends. Three sentences usually do it: the opening frame, the one continuous movement (of the camera or the subject, not both at full speed), and the last image you want to see.
Opening on a rain-soaked alley at night, a lone cyclist with a yellow jacket waiting under a flickering sign. The camera slowly pushes in as the cyclist pushes off and rides toward us, puddles splashing, reflections smearing across the asphalt. The shot ends on a close, sharp view of the wet front tyre rolling past the lens. Sound of rain, a distant siren, the soft whirr of a bicycle chain.A wide ultrawide landscape of a salt flat at dawn, a thin line of low mist hovering over the white ground, a single small tractor crossing the frame from left to right at walking pace. Slow, steady, almost still camera. Warm gold light grows behind the horizon. Quiet wind, an engine far away.Vertical video: a baker's hands dust a wooden table with flour, shape a round loaf and score the top with a razor in one quick motion. Close, warm kitchen light, shallow depth of field. Sounds of soft flour, the scrape of the blade, a gentle radio playing in the background.Settings that matter
- Duration: a whole number from 3 to 30, default 5. It is the setting that changes the writing most, so decide it before the prompt.
- Resolution: 720p by default, 1080p when you are ready for a final. Draft at the lower one.
- Aspect ratio: 16:9, 9:16, 1:1 or 21:9. The ratio is fixed by you, not guessed, so pick the one your destination needs; the aspect ratios guide lists the usual choices.
Keep the sound in the prompt
Since audio comes with the clip, treat it as part of the shot. One sentence about sounds at the end of the prompt, as in the examples above, is enough to steer it. If you want it silent, or you plan to score it yourself, say 'no music' so that a soundtrack does not arrive uninvited. If the generated sound is nearly right but not quite, the sound effects model for video can write a new soundtrack for a finished clip.
Where it falls short
Length is a risk as well as a gift. The longer the clip, the more room for a hand to grow a finger or a background to change quietly, and text on signs rarely stays readable. Several quick cuts in one prompt tend to blur into one odd shot, so ask for one continuous take, and for scenes that need the same character in several shots use an image-based model such as Kling V4.0 Reference-to-Video instead. For general advice on wording, see the text to video prompt guide, and every video model is on the models page.
Questions
How long can a Kling V4.0 text to video clip be?
From 3 to 30 seconds, in whole seconds, with 5 as the default.
Does the clip have sound?
Yes. It comes back with synchronized stereo audio. Describe the sounds at the end of the prompt, or write 'no music' if you want a quieter clip.
Which shapes and sharpness can I choose?
16:9, 9:16, 1:1 or 21:9, at 720p or 1080p. 720p is the default.
