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<!DOCTYPE html>
<html>
<!-- S head -->
<!-- <head>：这是 <html> 元素内的子元素，用于包含文档的元数据，比如字符编码声明、标题和外部样式表等。通常不会在网页中直接显示。-->
<head>
<meta charset="utf-8">
<meta name="description"
content="Concat-ID: Towards Universal Identity-Preserving Video Synthesis">
<meta name="keywords" content="Identity-Preserving, Video Synthesis">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Concat-ID: Towards Universal Identity-Preserving Video Synthesis</title>
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<script async src="https://www.googletagmanager.com/gtag/js?id=G-PYVRSFMDRL"></script>
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window.dataLayer = window.dataLayer || [];
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dataLayer.push(arguments);
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gtag('js', new Date());
gtag('config', 'G-PYVRSFMDRL');
</script>
<link href="https://fonts.googleapis.com/css?family=Google+Sans|Noto+Sans|Castoro"
rel="stylesheet">
<link rel="stylesheet" href="./static/css/bulma.min.css">
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</head>
<!-- E head -->
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<body>
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<!-- S 标题 -->
<!-- <section class="hero"> 是将 <section> 元素与 CSS 类名 "hero" 关联起来的表示方式。
类名 "hero" 可能表示该 <section> 元素是一个英雄区块，通常用于展示页面的引人注目的内容或重要信息。
通过使用类名，可以将样式和行为与特定的 <section> 元素关联起来，使其具有独特的外观和功能。
为了使类名有效，需要在 CSS 文件中定义相应的样式规则。-->
<section class="hero">
<div class="hero-body">
<div class="container is-max-desktop">
<div class="columns is-centered">
<div class="column has-text-centered">
<!-- 标题 -->
<h1 class="title is-1 publication-title">Concat-ID: Towards Universal Identity-Preserving Video Synthesis</h1>
<!-- 作者 -->
<div class="is-size-5 publication-authors">
<span class="author-block">
Yong Zhong</a><sup>1*</sup>,</span>
<span class="author-block">
Zhuoyi Yang</a><sup>2</sup>,</span>
<span class="author-block">
Jiayan Teng</a><sup>2</sup>,</span>
<span class="author-block">
Xiaotao Gu</a><sup>3</sup>,</span>
<span class="author-block">
Chongxuan Li</a><sup>1**</sup>
</span>
</div>
<!-- 作者单位 -->
<div class="is-size-5 publication-authors">
<span class="author-block"><sup>1</sup>Gaoling School of Artificial Intelligence, Renmin University of China, Beijing, China</span>
</br>
<span class="author-block"><sup>2</sup>Tsinghua University</span>
<span class="author-block"><sup>3</sup>Zhipu AI</span>
</div>
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class="external-link button is-normal is-rounded is-dark">
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</span>
<span>arXiv</span>
</a>
</span>
<!-- Code Link. -->
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<a href="https://github.com/ML-GSAI/Concat-ID"
class="external-link button is-normal is-rounded is-dark">
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</a>
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-->
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-->
<!-- Dataset Link. -->
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class="external-link button is-normal is-rounded is-dark">
<span class="icon">
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</span>
<span>Data</span>
</a>
</span>
-->
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<!-- E 标题 -->
<!-- S 预告片 -->
<!--
<section class="hero teaser">
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<video id="teaser" controls height="100%">
<source src="./static/videos/submit_demo_crop.mp4"
type="video/mp4">
</video>
<h2 class="subtitle has-text-centered">
<span class="dnerf">ControlVideo</span> fine-grained and controllable video editing
</h2>
</div>
</div>
</section>
-->
<!-- E 预告片 -->
<!-- -->
<!--
<h2 class="subtitle has-text-centered">
<span class="dnerf">ControlVideo</span> fine-grained and controllable video editing
</h2>
-->
<!-- E 滑块 -->
<!-- S 摘要 & Video-->
<section class="section">
<div class="container is-max-desktop">
<!-- Abstract. -->
<div class="columns is-centered has-text-centered">
<div class="column is-four-fifths">
<h2 class="title is-2">Abstract</h2>
<div class="content has-text-justified">
<p>
We present Concat-ID, a unified framework for identity-preserving video generation. Concat-ID employs Variational Autoencoders to extract image features, which are concatenated with video latents along the sequence dimension, leveraging solely 3D self-attention mechanisms without the need for additional modules. A novel cross-video pairing strategy and a multi-stage training regimen are introduced to balance identity consistency and facial editability while enhancing video naturalness. Extensive experiments demonstrate Concat-ID's superiority over existing methods in both single and multi-identity generation, as well as its seamless scalability to multi-subject scenarios, including virtual try-on and background-controllable generation. Concat-ID establishes a new benchmark for identity-preserving video synthesis, providing a versatile and scalable solution for a wide range of applications.
</p>
</div>
</div>
</div>
<!--/ Abstract. -->
<!-- Method. -->
<div class="columns is-centered has-text-centered">
<div class="column is-four-fifths">
<h2 class="title is-2">Method</h2>
<div class="custom-image">
<img src="./static/images/method.png" alt="Model architecture." style="width: 60%">
</div>
<div class="content has-text-justified">
<p>
We utilize a VAE to extract image latents from reference images and concatenate them at the end of the video latents along the sequence dimension. Concat-ID relies solely on 3D self-attention, which are commonly present in state-of-the-art video generation models, without introducing additional modules and parameters.
<!--<b>For fair comparisons, following previous works, we sample 8 frames from each video. We also show the edited results with 48 frames</b>.-->
</p>
</div>
<div class="custom-image">
<img src="./static/images/data.png" alt="Data construction.">
</div>
<div class="content has-text-justified">
<p>
To progressively balance identity consistency and facial editability, we construct three types of image-video pairs: pre-training pairs for learning conditional mapping, cross-video pairs for improving face editability, and trade-off pairs for finely balancing identity consistency and face editability.
</p>
</div>
<div class="content has-text-justified">
<p>
<span class="red-word">
Owing to the simplicity and efficiency of the model architecture, data construction, and training strategy, Concat-ID can seamlessly scale to multi-identity and multi-subject scenarios. </div>
</span>
</div>
</div>
<!--/ Method. -->
<!-- Paper video. -->
<!--
<div class="columns is-centered has-text-centered">
<div class="column is-four-fifths">
<h2 class="title is-3">Video</h2>
<div class="publication-video">
<iframe src="https://www.youtube.com/embed/MrKrnHhk8IA?rel=0&showinfo=0"
frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
</div>
</div>
</div>
-->
<!--/ Paper video. -->
</div>
</section>
<!-- S DEMO -->
<section class="hero is-light is-small">
<section class="section">
<div class="columns is-centered has-text-centered">
<h2 class="title is-2">Results</h2>
</div>
<div> <span>
</span> </div>
<!-- <div class="divider"></div> -->
<!-- HED-1 -->
<div class="container demo">
<h2 class="title is-3">Single-identity scenarios</h2>
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="main-video" controls height="100%" >
<source src="./static/videos/1.mp4"
type="video/mp4">
</video>
<p class="prompt-text">A woman with a joyful demeanor cycles energetically through the sun-dappled park, its face lit up by the interplay of light and shadow. The leaves rustle gently in the breeze as it raises a hand in a confident thumbs-up gesture, prompting nearby birds to flutter from a nearby tree, completing the lively scene.</p>
</div>
</div>
<div class="column">
<div class="item">
<video id="HEDgirl3style" sync="main-video" controls height="100%">
<source src="./static/videos/2.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person sits alone on a park bench, head bowed slightly, eyes glistening as a single tear slides down the cheek. The lips quiver, pressed into a thin line, while the shoulders tremble with the weight of an unspoken sorrow. The cool breeze carries away the muffled sigh. </p>
</div>
</div>
</div>
<!-- HED-2-->
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="HEDgirl7golden" sync="main-video" controls height="100%">
<source src="./static/videos/3.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A street artist in a worn-out denim jacket and a colorful bandana stands before a weathered wall, holding a can of spray paint. The head tilts slightly as the person examines the work—a vibrant bird taking shape. A focused expression crosses the face, lips pressed together in concentration.
</p>
</div>
</div>
<div class="column">
<div class="item">
<video id="HEDgirl7night" sync="main-video" controls height="100%">
<source src="./static/videos/4.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person in a sleeveless workout top stands in a gym, wiping sweat from the forehead. The head is slightly tilted down, eyes locked onto the weights ahead. The expression is focused, determination clear in the furrowed brow.
</p>
</div>
</div>
</div>
<!-- HED-3-->
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="HEDcar10red" sync="main-video" controls height="100%">
<source src="./static/videos/5.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A lively man with twinkling eyes and a warm smile stands amidst the vibrant chaos of a bustling market, waving cheerfully at the camera. The golden hue of the setting sun casts gentle shadows around, highlighting the colorful stalls brimming with fresh produce and fragrant spices. As he gesture animatedly, vendors shout his offers, and the air is filled with the rich aroma of street food, creating an atmosphere of energetic charm and lively camaraderie.
</p>
</div>
</div>
<div class="column">
<div class="item">
<video id="HEDcat4black" sync="main-video" controls height="100%">
<source src="./static/videos/6.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A man, dressed in casual attire, sits by a sunlit window sketching in a notebook, pausing occasionally to look up with a playful grin. As sunlight filters through the heer curtains, casting soft shadows across the room, the man twirls a pencil absentmindedly before adding quick strokes to the page. The scene is alive with a sense of relaxed creativity, as the warm afternoon glow bathes the space in a gentle, inviting atmosphere.
</p>
</div>
</div>
</div>
<div class="divider"></div>
<!-- Canny-1 -->
<h2 class="title is-3">Multi-identity scenarios</h2>
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="cannycar11red" sync="main-video" controls height="100%" >
<source src="./static/videos/2-1.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Two people sit on a park bench, each holding a cup of hot coffee. One leans back, head tilted up, eyes closed, enjoying the warmth. The other turns slightly, smiling as they speak, gesturing with one hand while the steam from their cup rises into the crisp morning air. </p>
</div>
</div>
<div class="column">
<div class="item">
<video id="cannycar11autumn" sync="main-video" controls height="100%">
<source src="./static/videos/2-2.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Two people sit on a park bench, each holding a cup of hot coffee. One leans back, head tilted up, eyes closed, enjoying the warmth. The other turns slightly, smiling as they speak, gesturing with one hand while the steam from their cup rises into the crisp morning air.
</p>
</div>
</div>
</div>
<!-- Canny-2-->
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="cannygirl8red" sync="main-video" controls height="100%">
<source src="./static/videos/2-3.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Two scientists stand in a lab, examining a set of test tubes. One tilts the head, carefully analyzing the liquid inside, while the other writes notes on a clipboard, brow furrowed in concentration. The hum of equipment surrounds them.
</p>
</div>
</div>
<div class="column">
<div class="item">
<video id="cannygirl8red3" sync="main-video" controls height="100%">
<source src="./static/videos/2-4.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Two musicians sit on a rooftop at sunset, each holding an instrument. One strums a guitar, head bobbing slightly with the rhythm, while the other plays a violin, eyes closed in concentration. The golden light casts long shadows as their music blends into the evening air.
</p>
</div>
</div>
</div>
<!-- Canny-3-->
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="cannygirl8red2" sync="main-video" controls height="100%">
<source src="./static/videos/2-5.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Two coworkers stand in an office hallway, deep in discussion. One crosses arms, head tilted slightly, listening intently. The other gestures with one hand, explaining something with enthusiasm. Their conversation echoes softly through the quiet workspace. </p>
</div>
</div>
<div class="column">
<div class="item">
<video id="cannygirl8red3" sync="main-video" controls height="100%">
<source src="./static/videos/2-6.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
Three people are sitting around a wooden table, bathed in soft, warm light. The person in the middle wears a light-colored sweater, speaking with enthusiasm, eyes bright with excitement. The person on the left, dressed in a dark jacket, leans forward slightly, elbows resting on the table, a thoughtful smile on their lips. The person on the right wears a blue T-shirt, head tilted slightly, expression calm with a smile. On the table, there are a few open books, a cup of tea, and a fountain pen. </p>
</div>
</div>
</div>
<div class="divider"></div>
<!-- Depth-1 -->
<h2 class="title is-3">Multi-subject scenarios</h2>
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="depthback1sun" sync="main-video" controls height="100%" >
<source src="./static/videos/3-1.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person wearing a shirt takes a casual walk through a tree-lined avenue. The scent of freshly cut grass fills the air, and the sun casts long shadows on the sidewalk. The head tilts slightly downward, a content expression settling on the face. </p>
</div>
</div>
<div class="column">
<div class="item">
<video id="depthback1style" sync="main-video" controls height="100%">
<source src="./static/videos/3-2.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person wearing a shirt stands on a street, smiling brightly. Eyes sparkle with happiness, and the head tilts slightly to the side.
</p>
</div>
</div>
</div>
<!-- Depth-2-->
<div class="columns is-centered">
<div class="column">
<div class="item">
<video id="depthcake" sync="main-video" controls height="100%">
<source src="./static/videos/3-3.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person wears a casual shirt, reading a book. The person's head is slightly tilted, eyes focused on the pages, lips curved into a faint smile. Sunlight streams through the tree, casting a warm glow on the face, creating a peaceful atmosphere. </p>
</div>
</div>
<div class="column">
<div class="item">
<video id="depthcar" sync="main-video" controls height="100%">
<source src="./static/videos/3-4.mp4"
type="video/mp4">
</video>
<p class="prompt-text">
A person wears a casual shirt, reading a book. The person's head is slightly tilted, eyes focused on the pages, lips curved into a faint smile. Sunlight streams through the window, casting a warm glow on the face, creating a peaceful atmosphere. </p>
</div>
</div>
</div>
<!-- <div class="divider"></div> -->
<!-- 一行多个模块并列 -->
<!--
<div class="columns is-centered">
<div class="column">
<div class="content">
<h2 class="title is-3">Visual Effects</h2>
<p>
Using <i>nerfies</i> you can create fun visual effects. This Dolly zoom effect
would be impossible without nerfies since it would require going through a wall.
</p>
<video id="dollyzoom" autoplay controls muted loop playsinline height="100%">
<source src="./static/videos/dollyzoom-stacked.mp4"
type="video/mp4">
</video>
</div>
</div>
<div class="column">
<div class="content">
<h2 class="title is-3">Visual Effects</h2>
<p>
Using <i>nerfies</i> you can create fun visual effects. This Dolly zoom effect
would be impossible without nerfies since it would require going through a wall.
</p>
<video id="dollyzoom" autoplay controls muted loop playsinline height="100%">
<source src="./static/videos/dollyzoom-stacked.mp4"
type="video/mp4">
</video>
</div>
</div>
<div class="column">
<h2 class="title is-3">Matting</h2>
<div class="columns is-centered">
<div class="column content">
<p>
As a byproduct of our method, we can also solve the matting problem by ignoring
samples that fall outside of a bounding box during rendering.
</p>
<video id="matting-video" controls playsinline height="100%">
<source src="./static/videos/matting.mp4"
type="video/mp4">
</video>
</div>
</div>
</div>
</div>
-->
<!-- 一行单个模块 -->
<!-- Animation. -->
<!--
<div class="columns is-centered">
<div class="column is-full-width">
<h2 class="title is-3">Animation</h2>
<h3 class="title is-4">Interpolating states</h3>
<div class="content has-text-justified">
<p>
We can also animate the scene by interpolating the deformation latent codes of two input
frames. Use the slider here to linearly interpolate between the left frame and the right
frame.
</p>
</div>
<div class="columns is-vcentered interpolation-panel">
<div class="column is-3 has-text-centered">
<img src="./static/images/interpolate_start.jpg"
class="interpolation-image"
alt="Interpolate start reference image."/>
<p>Start Frame</p>
</div>
<div class="column interpolation-video-column">
<div id="interpolation-image-wrapper">
Loading...
</div>
<input class="slider is-fullwidth is-large is-info"
id="interpolation-slider"
step="1" min="0" max="100" value="0" type="range">
</div>
<div class="column is-3 has-text-centered">
<img src="./static/images/interpolate_end.jpg"
class="interpolation-image"
alt="Interpolation end reference image."/>
<p class="is-bold">End Frame</p>
</div>
</div>
<br/>
<h3 class="title is-4">Re-rendering the input video</h3>
<div class="content has-text-justified">
<p>
Using <span class="dnerf">Nerfies</span>, you can re-render a video from a novel
viewpoint such as a stabilized camera by playing back the training deformations.
</p>
</div>
<div class="content has-text-centered">
<video id="replay-video"
controls
muted
preload
playsinline
width="75%">
<source src="./static/videos/replay.mp4"
type="video/mp4">
</video>
</div>
</div>
</div>
-->
</div>
</section>
</section>
<!-- S Comparsions -->
<!-- <section class="section"> -->
<section class="hero is-light is-small">
<section class="section">
<div class="columns is-centered has-text-centered">
<h2 class="title is-2">Comparsions</h2>
</div>
<div> <span>
</span> </div>
<!-- HED-1 -->
<div class="container demo">
<h2 class="title is-3">Single identity</h2>
<!-- HED-1-->
<div class="columns is-centered">
<div class="column is-full-width">
<div class="content">
<div class="bottom-text-container" width="100%">
<div class="bottom-text-group" style="width:19%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> ID-Animator</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span>ConsisID</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> <b> Concat-ID (Ours) </b></span>
</div>
</div>
<video id="comparestyle" controls height="100%" >
<source src="./static/videos/4-1.mp4"
type="video/mp4">
</video>
<p>
A person wearing a Superman outfit stands tall, arms crossed over the chest. The person's chin is lifted, eyes locked on the horizon with a determined gaze. A confident smirk appears as the cape flutters slightly in the breeze.
</p>
<!-- <p class="baseline-caption">
<span class="red-word">+ Krenz Cushart style</span>
</p> -->
</div>
</div>
</div>
<!-- HED-2-->
<div class="columns is-centered">
<div class="column is-full-width">
<div class="content">
<div class="bottom-text-container" width="100%">
<div class="bottom-text-group" style="width:19%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> ID-Animator</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span>ConsisID</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> <b> Concat-ID (Ours) </b></span>
</div>
</div>
<video id="comparestyle" controls height="100%" >
<source src="./static/videos/4-2.mp4"
type="video/mp4">
</video>
<p>
A street artist in a worn-out denim jacket and a colorful bandana stands before a weathered wall, holding a can of spray paint. The head tilts slightly as the person examines the work—a vibrant bird taking shape. A focused expression crosses the face, lips pressed together in concentration.
</p>
<!-- <p class="baseline-caption">
<span class="red-word">+ Krenz Cushart style</span>
</p> -->
</div>
</div>
</div>
<!-- HED-2-->
<div class="columns is-centered">
<div class="column is-full-width">
<div class="content">
<div class="bottom-text-container" width="100%">
<div class="bottom-text-group" style="width:19%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> ID-Animator</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span>ConsisID</span>
</div>
<div class="bottom-text-group" style="width:27%;">
<span> <b> Concat-ID (Ours) </b></span>
</div>
</div>
<video id="comparestyle" controls height="100%" >
<source src="./static/videos/4-3.mp4"
type="video/mp4">
</video>
<p>
A person sits alone on a park bench, head bowed slightly, eyes glistening as a single tear slides down the cheek. The lips quiver, pressed into a thin line, while the shoulders tremble with the weight of an unspoken sorrow. The cool breeze carries away the muffled sigh.
</p>
<!-- <p class="baseline-caption">
<span class="red-word">+ Krenz Cushart style</span>
</p> -->
</div>
</div>
</div>
<!-- </div> -->
<div class="divider"></div>
</div>
<!-- HED-1 -->
<div class="container demo">
<h2 class="title is-3">Multiple identities</h2>
<!-- HED-1-->
<div class="columns is-centered">
<div class="column is-full-width">
<div class="content">
<div class="bottom-text-container" width="100%">
<div class="bottom-text-group" style="width:20%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:20%;">
<span> Identity</span>
</div>
<div class="bottom-text-group" style="width:30%;">
<span>Ingredients</span>
</div>
<div class="bottom-text-group" style="width:30%;">
<span> <b> Concat-ID (Ours) </b></span>
</div>
</div>
<video id="comparestyle" controls height="100%" >
<source src="./static/videos/4-4.mp4"
type="video/mp4">
</video>
<p>
Two people sit on a park bench, each holding a cup of hot coffee. One leans back, head tilted up, eyes closed, enjoying the warmth. The other turns slightly, smiling as they speak, gesturing with one hand while the steam from their cup rises into the crisp morning air. </p>
<!-- <p class="baseline-caption">
<span class="red-word">+ Krenz Cushart style</span>
</p> -->
</div>
</div>
</div>
<!-- HED-2-->
<div class="columns is-centered">
<div class="column is-full-width">
<div class="content">
<div class="bottom-text-container" width="100%">
<div class="bottom-text-group" style="width:20%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:20%;">
<span>Identity</span>
</div>
<div class="bottom-text-group" style="width:30%;">
<span>Ingredients</span>
</div>
<div class="bottom-text-group" style="width:30%;">
<span> <b> Concat-ID (Ours) </b></span>
</div>
</div>
<video id="comparestyle" controls height="100%" >
<source src="./static/videos/4-5.mp4"
type="video/mp4">
</video>
<p>
Two friends sit at a train station, waiting for their ride. One stretches, arms raised above the head, letting out a relaxed sigh, while the other leans forward, elbows on knees, checking the time with a focused gaze. The distant sound of an approaching train fills the air.
</p>
<!-- <p class="baseline-caption">
<span class="red-word">+ Krenz Cushart style</span>
</p> -->
</div>
</div>
</div>
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<p>
This website is constructed using the source code provided by <a href="https://github.com/nerfies/nerfies.github.io">Nerfies</a>, and we are grateful for their template.
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