Seedance 2.0 Limits Explained: Max Duration, File Sizes & How to Bypass Them

Seedance 2.0 enforces a strict 15-second generation limit on the web and a 10-second cap on mobile apps. While the model supports up to 9 イメージ and 3 ビデオ per batch, users cannot generate long-form content directly. You must rely on the manual “Extend” feature to bypass this, which often leads to character inconsistency and frequent “Content Policy Violation” errors when attempting to generate copyrighted material or realistic figures. These restrictions force creators to juggle multiple accounts and phone numbers just to stitch together a single minute of footage.

現時点ではね、, シーダンス2.0 is primarily limited to users with an official ジメン (Dreamina) subscription, making access difficult for many creators outside ByteDance’s ecosystem. However, グローバルGPT is preparing to integrate シーダンス2.0 soon. In the meantime, if you cannot access the model directly, you can achieve similar high-end results by using alternatives like そら 2 または ベオ 3.1 on the GlobalGPTプラットフォーム.

Seedance 2.0 Limits: What Are the Official Technical Specifications?

シーダンス2.0 is a powerful tool, but it is not magic. To use it effectively without wasting your credits, you need to understand its strict “physical laws.” The model operates under hard limits designed to balance server costs and generation speed.

Maximum Video Duration: Why is it capped at 15 seconds?

Many users ask why they can’t generate a minute-long movie in one click. To understand the exact constraints, it helps to know how long Seedance 2.0 can generate. Currently, Seedance 2.0 enforces a strict duration limit to maintain quality.

• The 15-Second Wall: The maximum length for a single generation on the ウェブ版 is 15 seconds. You cannot generate 60 seconds at once.
• Mobile App Limitations: If you are using the Doubao or Jimeng App, the limit is often tighter, restricting you to 5-second or 10-second presets.
• Flexible Range: On the web interface, you can adjust the duration slider anywhere between 4 seconds and 15 seconds. Shorter videos (4-5s) cost fewer credits and generate faster.

Input Constraints: Understanding the “Rule of 12”

Seedance 2.0 allows you to mix text, images, videos, and audio. However, you cannot upload an unlimited amount of files. The system follows a “Rule of 12” for mixed inputs:

• Total File Limit: You can upload a maximum of 12 files in a single prompt batch.
• Image Cap: Within that limit, you can use up to 9 reference images (great for keeping character style consistent).
• Video & Audio Cap: You are limited to 3 reference videos そして 3 audio files.
• なぜこれが重要なのか： If you try to upload 10 images and 3 videos, the system will reject your request because the total (13) exceeds the limit.

Resolution & Audio: Does it support 4K and distinct audio tracks?

• 決議： The default output is 720p または 1080p depending on your plan. Currently, native 4K generation is さいようしない directly; you would need an external upscaler.
• Audio Sync: The model generates dual-channel stereo audio that matches the video length (max 15s). You cannot upload a 3-minute song and ask the AI to generate a 15-second video for it; the audio must be trimmed to match the video’s duration.

File Size Specs: <30MB images, <50MB videos constraints

Before you upload, check your file sizes. Heavy files will cause immediate upload failures:

• Images: Must be under 30MB per file (Formats: JPG, PNG, WEBP).
• Videos: Must be under 50MB and shorter than 15 seconds. If you upload a 1-minute video as a reference, the system will force you to crop it.

Seedance 2.0 Technical Specs Summary

How Can I Bypass the 15-Second Video Limit?

Since you cannot generate a long video in one go, you must use the “Extend” feature. This allows you to chain multiple 15-second clips together to create a theoretically infinite video.

Step-by-Step: Using the “Extend” Feature for Infinite Length

Follow this exact workflow to turn a short clip into a long movie:

1. Generate the First Clip: Create your initial 5-15 second video using your text or image prompts.
2. Select “Extend”: Once the video is done, click the “編集” button and select “Extend” (Video Extension).
3. Choose the Last Frame: The system will automatically use the last frame of your current video as the starting point for the new clip.
4. Write a New Prompt: Describe what happens next. (e.g., “The car continues driving into the sunset”).
5. Generate & Repeat: The AI will generate a new 4-15 second segment attached to the first one. Repeat this process as many times as needed.

GlobalGPT Insight: While this manual process works, it burns credits quickly. Users on the GlobalGPT Pro Plan ($10.8) often find it easier to switch to グーグルVeo 3.1 for long-form shots, as it supports 60-second generations natively without needing to stitch clips.

Pro Tips: How to Keep Characters Consistent During Extension

The biggest risk when extending a video is that your main character might start to look different (the “morphing” effect).

• Re-upload Reference Images: When you click “Extend,” do not just rely on the previous video frame. Re-upload the original face reference image in the prompt box. This reminds the AI what the character ～すべき look like.
• Lower Creativity Strength: Set the “Creativity/Hallucination” slider to Low (0.3 – 0.4). This forces the AI to stick closer to the previous footage rather than inventing new, random details.

Why Am I Getting “Content Policy Violation” Errors?

If your generation fails with a red warning message, it is likely not a technical bug, but a safety filter. Following recent pressure from Hollywood studios, Seedance 2.0 has tightened its rules significantly concerning privacy and content.

The “Real Face” Ban: Why you can’t generate celebrity deepfakes

You are strictly prohibited from uploading or generating realistic faces of real people.

• Identity Protection: If you upload a photo of a celebrity (e.g., Taylor Swift) or a politician, the system will detect the facial features and block the request immediately.
• The “Uncanny Valley” Filter: Even if you upload a photo of yourself, if it looks too “real” and the AI suspects it might be used for a deepfake, it may trigger a rejection.
• 解決策： Use stylized characters, anime styles, or fictional AI-generated faces instead of real photo references.

Copyright Restrictions: The impact of Disney & MPA’s legal pressure

Seedance 2.0 is currently under heavy scrutiny from the Motion Picture Association (MPA) and Disney.

• Keyword Blocking: Prompts containing specific IP names like “Iron Man,” “Mickey Mouse,” or “Harry Potter” typically trigger a violation error.
• Visual Matching: Even if you don’t use the name, uploading a picture of Spider-Man as a reference will likely be blocked by the visual safety filter.
• Why now? Unlike early 2025, the current version (2026) has integrated strict “Safeguards” to prevent the “virtual smash-and-grab” lawsuits mentioned in industry news.

New Safeguards: Blocking “Real Faces” and “Copyrighted IP”

• Real-time Scanning: The system scans your input images 前に generation starts.
• Text Analysis: It analyzes your prompt for banned combinations (e.g., “Hollywood actor fighting”).
• 結果 High-risk requests are rejected instantly to protect the platform from legal action.

Common Error Messages & Solutions

Is There a Daily Usage Limit or Free Quota?

Many creators want to know if they can use Seedance 2.0 for free. The answer depends on where you use it. The limits are different depending on where you use the app.

Jimeng Web vs. Doubao App: Where do you get more credits?

• Doubao App (Mobile):
  • The “10-Video” Rule: Usually, the mobile app gives you around 10 free generations per day.
  • 長所だ： It is simple and resets daily.
  • 短所だ： You have less control over settings (mostly fixed 5s or 10s duration).
• Jimeng Website (PC):
  • Credit System: You get roughly 60-70 free credits daily just for logging in.
  • Cost per Video: To understand how much Seedance 2.0 is, a standard 5-second video costs about 15 credits. A high-quality 10-second video can cost 30+ credits.
  • リアリティ・チェック This means you can only generate about 2 to 3 high-quality videos per day for free on the web.

The Cost of “Extending”: How quickly do you burn points?

Be careful with the “Extend” button. It is not free.

• 1 Extension = 1 New Generation: Extending a video by 5 seconds costs the same amount of credits as generating a brand new 5-second video.
• The Trap: If you want to make a 1-minute video using 4-second extensions, you will need to extend it 15 times. This will consume 400+ credits, which is far more than the daily free limit.

Account Farming Strategies vs. GlobalGPT Subscription

• The “Free” Way (Hard Mode): Users often register 5 different accounts using different phone numbers (friends, family) to get enough credits. This is time-consuming and annoying.
• The GlobalGPT Way (Easy Mode): Instead of managing 5 passwords, a single グローバルGPT プロ account gives you a massive pool of usage limits that resets, allowing you to focus on creating, not math.

Seedance 2.0 vs. Sora 2 vs. Veo 3.1: Which Model Has the Best Limits?

Seedance 2.0 is great, but is it the best? Let’s compare it in our Seedance 2.0 vs. Sora 2 showdown with the other giants available on GlobalGPT: OpenAI’s そら 2 and Google’s Veo 3.1.

Feature Showdown: Duration, Consistency, and Censorship Levels

Different models have different strengths. Don’t stick to just one.

• シーダンス2.0
  • Max Duration: 15 seconds (Web).
  • 最適： Character consistency (using “Rule of 12” images) and precise camera control.
  • 弱い： Very strict censorship (No real faces, no Disney IP).
• Sora 2 (OpenAI):
  • Max Duration: Up to 20 seconds (Pro).
  • 最適： Realistic physics and complex world-building (e.g., fluid dynamics, weather).
  • 弱い： Harder to control specific character looks compared to Seedance.
• Veo 3.1 (Google):
  • Max Duration: Known for supporting longer coherent shots (often 60s+ in demos).
  • 最適： Long, smooth cinematic shots without needing to “extend” every 5 seconds.
  • 弱い： Artistic style can sometimes feel less “sharp” than Seedance.

The Ultimate Model Comparison

Why Veo 3.1 might be better for long-form content

If your goal is to make a 1-minute documentary, using Seedance 2.0’s “Extend” feature 10 times is painful.

• The “Veo” Advantage: On GlobalGPT, you can switch to ベオ 3.1 to generate a long background shot in one click.
• The Workflow: Use Veo 3.1 for the long environment shots, and switch to Seedance 2.0 for the specific character acting shots (3-5s). This hybrid workflow saves time and credits.

Why Should I Access Seedance 2.0 via GlobalGPT?

Why pay for GlobalGPT when you can try to figure out how to access Seedance 2.0 directly? Because “free” often costs you time and frustration.

One Subscription ($5.8) for All Models (No Region Locks)

• The Price Gap:
  • Buying ChatGPT Plus ($20) + Midjourney ($10) + A VPN service ($10) = $40+/month.
  • GlobalGPT Basic Plan = ~$5.8/月.
• No “Wall”: Official Seedance requires a Chinese phone number (+86). Official Sora requires a US IP. GlobalGPT removes all these region locks. You can access everything from anywhere.

Switching Between Sora 2 and Seedance for Best Results

• Don’t Limit Yourself: Real pros don’t use just one tool.
• The “Hybrid” Strategy:
  1. 用途 そら 2 to generate a realistic city background.
  2. 用途 シーダンス2.0 to animate your specific character into that city.
  3. 用途 クロード 4.5 (Text) to write the script.
• All-in-One Dashboard: You can do all of this in a single browser tab on GlobalGPT, without logging in and out of different websites.

よくあるご質問

Q1: Can Seedance 2.0 generate videos longer than 15 seconds?

A: Not directly. You must use the “Extend” feature to manually add 4-15 second segments repeatedly, or switch to ベオ 3.1 on GlobalGPT for native long-form generation.

Q2: Why do I keep getting “Policy Violation” errors?

A: Seedance 2.0 strictly blocks realistic human faces (Deepfakes) and copyrighted IP (like Disney/Marvel characters). Use stylized or AI-generated characters to bypass this.

Q3: Is Seedance 2.0 free to use?

A: The Jimeng web version offers very limited daily credits (approx. 2-3 HQ videos), while the Doubao App provides around 10 free, lower-quality generations per day.

Q4: What is the “Rule of 12” in Seedance 2.0?

A: This is the hard input limit: you can upload a mix of images, videos, and audio, but the total file count cannot exceed 12 per prompt.

Q5: How can I access Seedance 2.0 without a Chinese phone number?

A: You can use the グローバルGPT platform, which aggregates Seedance 2.0, Sora 2, and other models into one subscription, removing the need for local verification or VPNs.

結論

Seedance 2.0 represents a significant leap in multimodal AI video generation, yet its strict 15-second duration cap and rigid safety filters remain the biggest hurdles for professional creators. To unlock its full potential, users must master the manual “Extend” workflow and strictly adhere to the “Rule of 12” input constraints to avoid upload failures. Ultimately, success with this model comes down to balancing its powerful creative tools with a clear understanding of its technical boundaries—working と the safety protocols rather than fighting against them.