Bowtie-flow: Efficient High-resolution Video Generation with Prior Preservation
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TL;DR: High-resolution video generation is slow: for example, Wan 2.1 takes over 50 minutes to generate a 720p video. Existing acceleration methods often compromise model priors (layout, semantics, motion). We propose Bowtie-flow, a two-stage framework: first, a fast low-resolution preview using a pretrained model; second, a Refiner to upscale while preserving priors. Key techniques include noise reshifting to reduce prior loss and shifting windows with careful training design. Bowtie-flow is simple, efficient, and compatible with various base models, achieving 12.5× speedup for generating 5-second, 16fps, 720p Wan 2.1 videos and 8.7× speedup for generating 5-second, 24fps, 720p HunyuanVideo.
Show Cases on 720P
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Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Bowtie-flow / 278s
Show Cases on 1080p
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Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Bowtie-flow / 331s
Comparisons
Quantitative comparison on Wan 2.1
Method | QS↑ | AQ↑ | DD↑ | MS↑ | OC↑ | SA↑ | PC↑ | Time↓ | Speed↑ | PFLOPs↓ |
---|---|---|---|---|---|---|---|---|---|---|
Wan 2.1 | 83.31 | 66.9 | 63.89 | 97.65 | 27.08 | 41.82 | 45.45 | 3497 (58min) | 1× | 658.46 |
30% Step | 77.92 | 58.43 | 56.94 | 96.95 | 24.56 | 18.18 | 16.36 | 1049 | 3.34× | 197.54 |
50% Step | 81.51 | 63.52 | 66.67 | 96.99 | 25.90 | 25.45 | 23.64 | 1748 | 2× | 329.23 |
SVG | 83.36 | 65.6 | 68.06 | 97.69 | 27.32 | 25.45 | 20.00 | 2712 | 1.29× | 429.86 |
DMD | 83.31 | 66.11 | 52.78 | 98.96 | 26.77 | 34.55 | 30.91 | 282 | 12.40× | 39.51 |
Ours | 83.26 | 66.86 | 72.22 | 97.95 | 27.38 | 41.82 | 38.18 | 278 | 12.58× | 34.3 |
Comparison Cases on 720p
A serene individual, dressed in a flowing white blouse and light blue jeans, stands at a rustic wooden table in a sunlit room filled with greenery. They carefully select vibrant blooms from a wicker basket, including roses, lilies, and daisies, and begin arranging them in a crystal vase. The sunlight filters through the window, casting a warm glow on their focused expression. As they work, their hands move gracefully, adjusting stems and leaves to create a harmonious bouquet. The scene transitions to a close-up of their hands tying a delicate ribbon around the vase, completing the arrangement with a touch of elegance. The final shot captures the person stepping back to admire their creation, a satisfied smile on their face, with the room’s natural beauty enhancing the tranquil atmosphere.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A paint roller applies a coat of beige paint to a textured wall, showing the paint filling in the textures.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A towering Bigfoot trudges through a fierce snowstorm, its massive, fur-covered form barely visible against the swirling white. The creature’s powerful strides leave deep footprints in the snow, each step echoing its immense weight and strength. Snow clings to its thick, matted fur, and its eyes, glowing faintly, peer through the blizzard with an almost human-like intensity. The wind howls around it, whipping up flurries that obscure its path, but Bigfoot moves with purpose, undeterred by the harsh elements. The scene captures the raw, untamed wilderness, with the mythical creature embodying the mystery and majesty of nature’s most elusive legends.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A tranquil Zen garden with a gently flowing stream and koi fish.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A young woman with short, curly hair stands in a modern, well-lit bathroom, wearing a white bathrobe. She looks into the mirror with a focused expression, holding a blue toothbrush. As she begins brushing her teeth, the camera captures the rhythmic motion of her hand and the foamy toothpaste. The scene shifts to a close-up of her mouth, showing the thorough brushing of each tooth. The background features sleek, minimalist decor with a potted plant on the counter. Finally, she rinses her mouth with water, her face reflecting a sense of freshness and readiness for the day ahead.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A high-speed video of a splash created by a stone thrown into a pond.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A cute furry monster is blowing on hot cocoa to cool it down.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A bearded man in his thirties, wearing a plaid shirt and jeans, sits at a rustic wooden bar, surrounded by an array of beer taps and vintage brewery decor. He carefully lifts a frosty pint glass filled with amber beer, examining its color and clarity against the warm, ambient lighting. He takes a slow, appreciative sip, his eyes closing momentarily as he savors the complex flavors. The camera captures the subtle smile of satisfaction on his face, highlighting the rich foam on his upper lip. The background hum of soft chatter and clinking glasses adds to the cozy, inviting atmosphere of the pub.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
A focused artist, wearing a cozy gray sweater, sits at a wooden desk in a warmly lit room, surrounded by art supplies. The camera zooms in on their hands, skillfully sketching intricate details on a large canvas with a fine-tipped pen. The scene shifts to show the artist’s concentrated face, glasses perched on their nose, as they meticulously add shading to the drawing. The room’s ambiance, filled with soft light from a nearby window and the gentle hum of background music, enhances the creative atmosphere. Finally, the artist steps back, revealing a stunning, detailed illustration of a serene forest landscape.
Wan2.1
Wan2.1 30%step
Wan2.1 50%step
DMD
SVG
Ours
More Comparison Cases on 1080p
In a whimsical and playful scene, a fluffy white cat sits in the driver's seat of a sleek black car, curiously exploring the city streets.
Low-res Video
RealBasicVSR
VEnhancer
STAR
Upscale-A-Video
Ours
A lively corgi struts along a tropical island beach, wearing blue sunglasses, enjoying the rhythmic waves and sunlight.
Low-res Video
RealBasicVSR
VEnhancer
STAR
Upscale-A-Video
Ours
A drone zips through a volcano crater, weaving between molten lava rivers and glowing jagged rocks, capturing thrilling aerial views.
Low-res Video
RealBasicVSR
VEnhancer
STAR
Upscale-A-Video
Ours
A young woman enjoys a juicy slice of watermelon on a sunlit garden bench, surrounded by vibrant flowers and greenery.
Low-res Video
RealBasicVSR
VEnhancer
STAR
Upscale-A-Video
Ours
Contact Us
Feel free to contact Kaixin Ding at kxding@connect.hku.hk for any question,cooperation, and communication.
If you find this work useful, please consider citing:
@article{ding2025bowtieflow, title={Bowtie-flow: Efficient High-resolution Video Generation with Prior Preservation}, author={Kaixin Ding and Xi Chen and Sihui Ji and Yuan Gao and Liang Hou and Xin Tao and Pengfei Wan and Hengshuang Zhao}, journal={arXiv preprint arXiv:}, year={2025} }