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AI Video Generation Online Text-to-Video Tool Tutorial
Choosing the Right Online AI Video Generation Tool
Currently mainstream online AI video generation tools include:
- **Runway Gen-2**: Supports text-to-video and image-to-video, high generation quality, suitable for creative short films.
- **Pika Labs**: Used via Discord, simple operation, active community.
- **Sora (OpenAI)**: Not yet public, but worth attention, capable of high-quality long video generation.
- **Domestic platforms**: Such as Tongyi Wanxiang, Jimeng, Tencent Zhiying, support Chinese and are easily accessible.
For beginners, it is recommended to start with **Runway** or **Pika Labs**. Runway has a free trial quota, and Pika offers basic features for free through Discord.
Writing Effective Video Prompts
Video prompts are similar to image prompts but require dynamic descriptions and temporal order. Basic structure: **Subject + Action + Scene + Style + Camera Movement**.
Example:
`A cat chases a butterfly in the garden, sunny day, camera slowly follows, cinematic, high definition`
Tips:
- Describe clear actions and changes, avoid static descriptions.
- Use camera terminology such as "push in, pull out, pan, tilt", "close-up", "long shot".
- Specify video style, such as "animation", "realistic", "cyberpunk".
- Add negative prompts to exclude unwanted elements, like "blurry, shaky, deformed".
Setting Generation Parameters
Parameters vary by tool, common ones include:
- **Video duration**: Typically 4-8 seconds, some tools support longer.
- **Resolution**: Such as 720p, 1080p, affecting clarity and file size.
- **Frame rate**: Usually 24fps or 30fps; 24fps for cinematic feel.
- **Motion strength**: Controls dynamic intensity to avoid over-distortion.
- **Random seed**: Fixing it can reproduce similar results.
Steps for Online Text-to-Video
- Open the chosen tool's website (e.g., Runway: runwayml.com) and register/login.
- Go to "Text to Video" or similar feature.
- Enter the description in the prompt input box.
- Set parameters such as video duration, resolution, frame rate.
- Click "Generate" and wait from a few minutes to over ten minutes.
- Preview the generated video, download or further edit it.
- If not satisfied, adjust prompts or parameters and regenerate.
- **Image-to-video**: Upload an image as the starting frame and combine with text description to generate dynamic effects, improving controllability.
- **Multi-clip stitching**: Generate multiple short clips and stitch them into a complete story using editing software.
- **Style transfer**: Use image stylization tools to process keyframes before generating video.
- **Sound effects**: Some tools support adding background music or sound effects to enhance viewing experience.
- **Learn from excellent cases**: Browse communities and refer to others' prompts and parameter settings.
Advanced Tips
FAQ
Why do AI-generated videos often have distortions or deformations?
This is a current technical limitation, especially with fast motion or complex scenes. You can reduce motion strength, simplify descriptions, shorten duration, or use image-to-video to improve stability.
How long can free tools generate videos?
Free versions usually limit to about 4 seconds at 720p, with watermarks or usage limits. Paid versions can generate longer, higher-resolution videos without watermarks.
What AI video tools are available in China?
Domestic platforms like Tongyi Wanxiang, Jimeng, Tencent Zhiying are accessible, support Chinese prompts, and some offer free trials.
How can I increase video resolution?
Choose a higher resolution option (e.g., 1080p), but it will increase generation time and resource consumption. Alternatively, generate at low resolution first and then upscale using video enhancement tools.
Can generated videos be used commercially?
Check the platform's terms of service. Some platforms allow commercial use, while others require a commercial license. Be sure to confirm copyright ownership.