LongCat Single Avatar (Image + Audio)

Animate your portrait photos with realistic lip-sync from audio.

Inputs

Input Image

Image

Input Audio

Output

Generated

Upload your video and sync lips in seconds

10,000+ generations this month

📄 About LongCat Single Avatar (Image + Audio)

The LongCat Single Avatar (Image + Audio) model transforms static portraits into dynamic, ultra-realistic videos driven entirely by your own audio. Leveraging advanced AI and deep learning, this model generates lifelike, lip-synced avatar animations with natural facial expressions, smooth movements, and precise mouth synchronization. Simply upload a portrait image and an audio clip, provide a guiding text prompt, and watch as your avatar comes to life on screen. At its core, LongCat Single Avatar uses state-of-the-art video generation technology that analyzes both visual and audio cues. The model produces videos with remarkable realism, ensuring the avatar's lips, facial expressions, and head movements match the audio input perfectly. The result is an engaging, believable video that feels as though a real person is speaking, not just an animated still image. Customization is a key strength of this model. Users can control video style and content through detailed text prompts, while negative prompts help avoid unwanted artifacts or qualities. The system offers flexibility in output resolution, supporting both standard (480p) and high-definition (720p) videos. For longer content, you can chain up to 10 video segments, each seamlessly animated for up to 5-6 seconds, making it ideal for presentations, explainer videos, virtual communication, and more. Advanced options cater to both novices and power users. Parameters like inference steps, text and audio guidance scales, and random seed control allow fine-tuning for optimal results. The model’s audio guidance features ensure accurate and expressive lip movements, while the integrated safety checker provides responsible content generation. LongCat Single Avatar is perfect for content creators, educators, marketers, and anyone seeking to generate personalized, talking avatar videos without complex video editing. Its applications range from personalized video messages and social media content to educational explainers, business presentations, and digital assistants. By combining ease of use with cutting-edge AI, this model democratizes high-quality video avatar creation, making it accessible for any skill level. Whether you’re enhancing your brand with a unique digital spokesperson, bringing static images to life for storytelling, or streamlining video production workflows, LongCat Single Avatar offers a powerful, intuitive solution. All usage operates on a convenient pay-as-you-go credit system, letting you scale your creative output as needed. Experience the next generation of AI-driven video content and engage your audience like never before.

✨ Key Features

Transforms any portrait image and audio clip into ultra-realistic, lip-synced avatar videos.

Advanced lip synchronization ensures mouth movements precisely match the provided audio.

Supports custom text prompts and negative prompts for fine-grained video content control.

Flexible video resolution options: choose between standard 480p and HD 720p outputs.

Generate videos up to 10 segments long, suitable for extended presentations or messages.

Adjustable inference steps, text guidance, and audio guidance scales for tailored results.

Built-in safety checker helps ensure responsible and appropriate content generation.

💡 Use Cases

⚡Creating personalized video greetings or announcements with your own avatar.

⚡Generating explainer or educational videos using a custom digital spokesperson.

⚡Producing social media content with engaging, talking character images.

⚡Enhancing business presentations with an animated, voice-driven avatar.

⚡Developing virtual assistants and chatbots with realistic, speaking faces.

⚡Storytelling and digital content creation for marketing campaigns.

⚡Localizing messages by animating avatars in different languages or voices.

🎯 Best For

🎯 Content creators, educators, marketers, social media managers, and anyone seeking to generate personalized, realistic avatar videos.

👍 Pros

✓Produces highly realistic, expressive avatar videos from simple inputs.

✓Easy to use with both beginner-friendly and advanced customization options.

✓Supports both short and longer video segments for flexible content creation.

✓Fine-tuned control over style, quality, and dynamics via prompts and parameters.

✓No need for complex video editing or animation skills.

⚠️ Considerations

△Requires high-quality input images and audio for best results.

△Longer videos may require multiple segments, increasing generation time.

△Limited to single avatar animation per video.

△Advanced settings may require experimentation for optimal outcomes.

📚 How to Use LongCat Single Avatar (Image + Audio)

Upload your chosen portrait image (JPG, PNG, or other supported formats).

Upload the audio file you want the avatar to speak or animate to.

Enter a descriptive prompt to guide the video’s scenario, expression, or action.

Optionally, add a negative prompt to avoid unwanted video features or artifacts.

Select your preferred video resolution (480p or 720p) and set the desired video length by choosing the number of segments.

Click generate and wait for the AI to process; download your finished avatar video once it’s ready.

💡 Pro Tips for LongCat Single Avatar (Image + Audio)

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Use High-Resolution Portrait Photos The quality of your input image directly affects the final video. Use well-lit portraits with the face clearly visible and looking toward the camera. Avoid side angles, shadows across the face, or low-resolution images. A clean headshot with neutral background works best. If you need to generate multiple avatars simultaneously, consider LongCat Multi Avatar for group scenes.

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Record Clean Audio Without Background Noise Audio quality is critical for accurate lip sync. Record in a quiet environment using a decent microphone, avoiding echo, wind noise, or background chatter. The model analyzes audio waveforms to drive mouth movements, so clear speech produces the most realistic results. For audio-only workflows without providing an image, try LongCat Single Avatar (Audio Only) which generates both the avatar and animation.

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Write Detailed Scene Prompts The text prompt guides the overall video style, lighting, and setting. Be specific: instead of "person talking," write "A professional speaker stands on a conference stage under warm spotlight, gesturing naturally while speaking." This helps the model generate appropriate context, body language, and atmosphere. Combine with negative prompts to exclude unwanted elements like blurriness or distorted features.

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Start with 480p for Faster Iteration Resolution affects both generation time and credit cost. Standard 480p costs 1 credit per second, while 720p costs 4 credits per second. For testing prompts, audio sync, and scene composition, start with 480p to iterate quickly. Once you've dialed in the perfect settings, generate your final output at 720p for polished, high-definition results suitable for professional use.

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Adjust Audio Guidance for Expression Control The audio guidance scale parameter controls how exaggerated the mouth movements are. The default value of 4 works well for natural speech, but you can increase it to 6-8 for more pronounced lip sync if your audio has strong emphasis or singing. Lower values (2-3) produce subtler movements for calm, conversational delivery. Experiment to match your content's tone.

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Chain Segments for Longer Presentations Each segment generates approximately 5-6 seconds of video. For longer content like tutorials or messages, set num_segments to 2-10 to create extended videos up to a minute long. The model seamlessly chains segments together. For even longer content or text-driven avatar creation, explore HeyGen Digital Twin Avatar V4 which supports multi-minute videos from scripts.

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Frequently Asked Questions

You can use most standard image formats (such as JPG, PNG) for the portrait and common audio formats (such as MP3, WAV) for the voice input. For the best results, use high-quality, clear images and audio.

Each segment is approximately 5-6 seconds long, and you can generate up to 10 segments per video. This allows for videos ranging from a few seconds to nearly a minute in total length.

No video editing or animation experience is necessary. The interface is user-friendly, and the model handles all the complex generation processes for you.

Pricing varies by model and is based on a pay-as-you-go credit system. This allows you to purchase credits as needed without long-term commitments.

Yes, you can use descriptive prompts to guide the avatar’s appearance, mood, and actions, and negative prompts to filter out unwanted elements or styles.

LongCat Single Avatar uses a pay-per-second credit model based on resolution. At 480p, you'll spend approximately 1 credit per second of video, so a 6-second single segment costs around 6 credits. At 720p, the cost increases to roughly 4 credits per second, making a 6-second segment about 24 credits. If you generate 5 segments (around 30 seconds total) at 720p, expect to use approximately 120 credits. JAI Portal's pay-as-you-go system means you only pay for what you generate, with no monthly subscription. You can purchase credit packages at /auth/signup and scale your usage based on project needs.

Yes, all videos generated using paid credits on JAI Portal come with full commercial-use rights. You can use your lip-synced avatar videos in marketing campaigns, client presentations, social media content, educational courses, product demos, and any other commercial application. This includes monetized YouTube videos, paid advertising, and resale as part of broader creative services. The only requirement is that you generate the content using your own JAI Portal credits. Always ensure your input images and audio comply with applicable rights and permissions, especially when using photos or voice recordings of real people.

LongCat Single Avatar outputs MP4 video files, the most widely compatible format for web, social media, and video editing software. The frame rate is typically 24-30 fps depending on generation parameters, providing smooth, natural motion suitable for professional use. Once generation completes, you can download the MP4 file directly from your JAI Portal dashboard or via the API response. The files are hosted temporarily on JAI Portal's CDN, so download them promptly for archival or further editing. You can then import the videos into any standard editing software like Adobe Premiere, Final Cut Pro, or DaVinci Resolve for additional post-production.

Yes, LongCat Single Avatar works with audio in any language or accent. The model analyzes audio waveforms and phonetic patterns rather than specific language semantics, so it can generate accurate lip sync for English, Spanish, Mandarin, French, Arabic, and dozens of other languages. Accents and regional speech patterns are also supported. For best results, ensure the audio is clear regardless of language. This makes the model ideal for creating localized content, multilingual marketing videos, or international educational materials. If you need text-to-speech avatar generation in multiple languages, consider VEED Fabric 1.0 Text which converts written scripts directly into voiced avatar videos.

Absolutely. JAI Portal provides a REST API that allows you to integrate LongCat Single Avatar into automated workflows, batch processing pipelines, or custom applications. You can programmatically submit image URLs, audio files, and generation parameters, then poll for completion and retrieve the output video URL. This is ideal for use cases like generating personalized video messages for thousands of customers, creating automated news anchors, or building interactive chatbots with realistic video responses. API access uses the same credit system as the web interface. Visit the API documentation at JAI Portal or contact support for integration guidance, rate limits, and best practices for high-volume generation.

⚖️ How LongCat Single Avatar (Image + Audio) Compares

LongCat Single Avatar (Image + Audio) excels at transforming a single portrait photo into a realistic, lip-synced video driven by your own audio file. It's ideal when you have both a specific image and audio recording you want to combine. Compared to LongCat Single Avatar (Audio Only), this model requires you to supply the portrait image, giving you precise control over the avatar's appearance but requiring an existing photo. If you need to animate multiple people in one scene, LongCat Multi Avatar handles group compositions. For users seeking higher-end avatar creation with advanced facial reenactment and longer video support, HeyGen Digital Twin Avatar V4 offers digital twin technology and multi-minute outputs, though at a higher credit cost. If you want to generate avatars from text scripts without recording audio, Kling AI Avatar v2 Standard or Kling AI Avatar v2 Pro provide text-to-speech avatar generation. LongCat Single Avatar strikes a balance between quality, ease of use, and cost-efficiency, making it perfect for content creators, marketers, and educators who want professional lip-sync videos without complex editing. You can compare models side-by-side at JAI Portal's comparison tool or start creating your first avatar video at /auth/signup with pay-as-you-go credits.