Runway Text to Video: How It Works

Runway’s text-to-video feature lets you generate short video clips directly from a written prompt, and this article explains exactly what it does, how to use it, and what its limits are. You type a description of a scene, and the model produces a few seconds of footage that matches it. The tool is part of Runway’s Gen-3 and Gen-2 models, available through their web app and API.

Formula

The calculator uses two simple formulas that relate time, distance, pace, and speed. The average pace is the finish time divided by the distance: pace = t / d, where t is in minutes and d is in kilometers, giving a result in minutes per kilometer. The average speed is the distance divided by the time in hours: speed = d / (t / 60), which converts minutes to hours, giving a result in kilometers per hour.

Worked Example

Using the default values from the calculator block (t = 50 minutes, d = 10 km), the pace is 50 / 10 = 5.00 min/km. The speed is 10 / (50 / 60) = 10 / 0.8333 = 12.00 km/h. So a 10 km run in 50 minutes means you averaged 5 minutes per kilometer, which is 12 km/h.

What Runway Text to Video Actually Does

Runway is a generative AI platform that produces video from text prompts. The current generation, Gen-3, was released in 2024 and is available to all users, though free accounts have limited credits. Text-to-video is the core feature: you describe a scene, and the model generates a clip that matches the description. The output is typically 5 to 10 seconds long, depending on the plan and the model version. Gen-3 also supports image-to-video, where you provide a starting image and the model animates it, and video-to-video, where you transform an existing clip.

The quality is impressive for short clips, but it is not a full film generator. You cannot get a multi-minute narrative with consistent characters and plot. The model works best with simple, concrete scenes: a dog running on a beach, a city street at night, a person walking through a forest. Abstract or complex prompts often produce odd results, with objects morphing or disappearing.

How to Use Runway Text to Video

Using the tool is straightforward, but getting good results takes practice. Here are the basic steps:

• Go to runwayml.com and sign in or create an account.
• Click on the “Generateâ€� tab and select “Text to Video.â€�
• Type a detailed prompt describing the scene, camera movement, lighting, and mood.
• Choose the model (Gen-3 is the default) and the aspect ratio (16:9, 9:16, or 1:1).
• Click “Generateâ€� and wait for the clip to render, which can take a few minutes.
• Preview the result and either download it or refine the prompt and try again.

For better results, be specific. Instead of “a cat,� write “a close-up of a gray tabby cat sitting on a windowsill, soft morning light, shallow depth of field.� Include camera instructions like “slow pan� or “aerial shot.� Avoid telling the model what not to do, as it often ignores negations.

Common Problems and How to Fix Them

The most frequent issue is that the generated video does not match the prompt. This happens because the model interprets words literally and has a limited understanding of complex relationships. For example, “a man holding an umbrella while walking a dog� might result in the umbrella floating or the dog missing. To fix this, simplify the scene and break it into smaller parts. Generate separate clips for each element and combine them in an editor.

Another problem is that characters or objects change appearance between frames. This is a known limitation of current text-to-video models. The model generates each frame independently, so it can lose track of details. Using a consistent seed or generating a longer clip and cutting out the best part can help. Also, avoid prompts that require precise physics, like a glass falling and breaking, as the model often fails at such tasks.

Runway vs. Other Text-to-Video Tools

Runway is one of several text-to-video tools available in 2024. Others include OpenAI’s Sora, Pika Labs, and Stability AI’s Stable Video Diffusion. Sora is known for high-quality, longer clips but is not widely available to the public. Pika is popular for its simple interface and fast generation, but the output is often lower resolution. Stable Video Diffusion is open-source, meaning you can run it locally, but it requires a powerful GPU and technical knowledge.

Runway sits in the middle: it offers good quality, a user-friendly interface, and a generous free tier (limited credits). It is a solid choice for beginners and for quick prototyping. However, for professional work, you may need to use multiple tools or combine Runway with traditional editing software.

Costs and Plans

Runway offers a free plan with a limited number of credits per month, which is enough to generate a few short clips. Paid plans start at around $12 per month for the Standard plan, which includes more credits and higher resolution output. The Pro plan, at $28 per month, adds more credits, faster rendering, and access to newer models. There is also an Enterprise plan for teams. Prices are subject to change, so check the official website for current rates.

Each generation consumes credits, typically 1 credit per second of video, but this can vary. For example, a 5-second clip might cost 5 credits. Free users get about 125 credits per month, which is roughly 25 seconds of video. This is enough to test the tool, but not to produce a full project.

Safety and Ethical Considerations

Runway has content policies that prohibit generating harmful or deceptive content. You cannot create videos of real people without their consent, or content that depicts violence, hate speech, or sexual material. The platform uses automated filters to block such prompts, but they are not perfect. Users are responsible for the content they create and how they use it.

There is also the broader concern of deepfakes and misinformation. Text-to-video tools can create realistic fake footage, which could be used to spread false information. Runway requires users to agree to terms of service that prohibit misuse, and they add watermarks to some outputs. However, these measures are not foolproof, and it is important to be aware of the ethical implications when using such tools.

Frequently Asked Questions

How long are the videos generated by Runway?

By default, Runway generates clips that are 5 seconds long. With some plans, you can extend this to 10 seconds, but not longer. The model is designed for short shots, not full scenes. If you need a longer video, you can generate multiple clips and edit them together, but you will need to maintain consistency manually.

Can I use Runway for free?

Yes, Runway offers a free plan that gives you a limited number of credits each month. With the free plan, you can generate a few short clips, but you will have to wait in a queue and the output resolution is lower. To use the tool more heavily, you need a paid subscription.

What is the best prompt format for Runway?

The best prompts are descriptive and concrete. Include the subject, action, setting, lighting, and camera movement. For example: “A cinematic shot of a lone figure walking through a foggy forest, dappled light, slow dolly in.� Avoid abstract concepts and multiple actions in one scene. Keep it simple and visual.

Does Runway support image-to-video?

Yes, Runway supports image-to-video, where you upload a starting image and the model animates it. This is often more reliable than text-to-video because the model has a visual reference. You can use this feature to create consistent characters or to add motion to a still photo.

Can I use Runway videos commercially?

Yes, if you are on a paid plan, you can use the videos for commercial purposes. The free plan restricts commercial use. However, you must ensure that your content does not violate Runway’s terms of service, such as using real people without consent or creating misleading content.

Why does my video have watermarks?

Runway adds a watermark to videos generated on the free plan. Paid plans do not have watermarks. The watermark is a small logo in the corner of the video. If you want to remove it, you need to upgrade to a paid plan.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2