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About longcat video avatar 1.5
LongCat Video Avatar 1.5 is an open-source audio-driven digital human model developed by Meituan. Built on upgraded DiT diffusion architecture and Whisper-Large-v3 audio encoder, it simplifies the complicated traditional digital human production workflow. With only one static picture and an audio clip as inputs, it automatically generates short dynamic videos where lip movements and facial expressions match original voice perfectly, making it a highly practical open-source AIGC avatar generation tool.
Compared with previous editions, V1.5 realizes comprehensive upgrades on core algorithms. Its renewed audio coding module powered by Whisper large model processes multiple languages including Chinese, English, Japanese and Korean. It accurately captures tone and pace features from daily talks, fast monologues and singing voices, effectively fixing common flaws like mismatched lip sync and rigid facial expressions. Optimized sampling is cut down to 8 steps alongside INT8 quantization, boosting inference speed by over ten times and lowering hardware requirements. Local deployment is available on ordinary GPUs with merely 8GB VRAM, enabling regular creators to operate without high-end computing devices.
In terms of content compatibility, the tool is no longer limited to realistic human portraits. It supports three major material types: real human photos, 2D anime illustrations and pet snapshots. Pictures of diverse art styles can be converted into animated videos via audio driving. A brand-new multi-character dialogue function is added: different figures in one frame move their faces and heads only when speaking according to assigned audio, while listeners stay still to mimic natural real-life conversations. Moreover, the video continuation feature allows users to extend finished videos with new audio inputs to avoid redundant image generation work.
This model fits various practical scenarios, supporting mass production of self-media narration clips, e-commerce product introductions, popular science short videos and virtual idol animation. Licensed under MIT open-source agreement, it is free for commercial use for both individuals and enterprises without extra copyright fees. Thanks to low running cost, high visual restoration and wide-format adaptability, LongCat Video Avatar 1.5 stands as a top open-source option for mass digital-human content creation across the short-video industry.
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