Black Video Output

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Introduction

When working with video processing and analysis, a black video output can be frustrating and time-consuming to resolve. In this article, we will focus on troubleshooting the black video output issue when using the example_workflows/wanvideo_480p_I2V_example_02.json workflow in ComfyUI-Manager.

System Configuration

Before diving into the troubleshooting process, it's essential to understand the system configuration. The provided system configuration output indicates the following:

  • ComfyUI startup time: 2025-04-10 15:52:26.992
  • Platform: Linux
  • Python version: 3.11.11, packaged by conda-forge
  • Python executable: /opt/conda/bin/python
  • ComfyUI Path: /ComfyUI
  • ComfyUI Base Folder Path: /ComfyUI
  • User directory: /ComfyUI/user
  • ComfyUI-Manager config path: /ComfyUI/user/default/ComfyUI-Manager/config.ini
  • Log path: /ComfyUI/user/comfyui.log
  • Total VRAM: 97285 MB
  • Total RAM: 49152 MB
  • PyTorch version: 2.6.0+cu126
  • ComfyUI version: 0.3.27
  • ComfyUI frontend version: 1.14.5

Troubleshooting Steps

1. Verify Workflow Configuration

The first step in troubleshooting the black video output issue is to verify the workflow configuration. In this case, we are using the example_workflows/wanvideo_480p_I2V_example_02.json workflow. Ensure that the workflow is correctly configured and that there are no syntax errors.

2. Check PyTorch Version

The provided system configuration output indicates that the PyTorch version is 2.6.0+cu126. Ensure that the PyTorch version is compatible with the ComfyUI version. If the PyTorch version is outdated, update it to the latest version.

3. Verify VRAM and RAM Configuration

The system configuration output indicates that the total VRAM is 97285 MB and the total RAM is 49152 MB. Ensure that the VRAM and RAM configuration are sufficient for the ComfyUI application.

4. Check ComfyUI Version

The provided system configuration output indicates that the ComfyUI version is 0.3.27. Ensure that the ComfyUI version is compatible with the PyTorch version. If the ComfyUI version is outdated, update it to the latest version.

5. Verify Log Files

The system configuration output indicates that the log path is /ComfyUI/user/comfyui.log. Verify the log files to identify any errors or issues that may be causing the black video output.

6. Check for Conflicts with Other Applications

Ensure that there are no conflicts with other applications that may be using the same resources as ComfyUI. Close any unnecessary applications and try running ComfyUI again.

7. Reset ComfyUI Configuration

If none of the above steps resolve the issue, try resetting the ComfyUI configuration to its default. This will delete any custom settings and configurations, so ensure that you have backed up any important data.

8. Contact Support

If none of the above steps resolve the issue, contact the ComfyUI support team for further assistance.

Conclusion

In conclusion, troubleshooting the black video output issue in ComfyUI-Manager requires a systematic approach. By verifying the workflow configuration, checking the PyTorch version, verifying VRAM and RAM configuration, checking the ComfyUI version, verifying log files, checking for conflicts with other applications, resetting ComfyUI configuration, and contacting support, you can resolve the issue and get back to working with video processing and analysis.

Additional Resources

For further assistance, refer to the following resources:

Related Articles

Introduction

In our previous article, we discussed troubleshooting the black video output issue in ComfyUI-Manager. However, we understand that sometimes, a simple troubleshooting guide may not be enough to resolve the issue. That's why we've put together a Q&A article to help you address some of the most frequently asked questions related to the black video output issue in ComfyUI-Manager.

Q: What are the common causes of black video output in ComfyUI-Manager?

A: The common causes of black video output in ComfyUI-Manager include:

  • Incorrect workflow configuration
  • Outdated PyTorch version
  • Insufficient VRAM and RAM configuration
  • Conflicts with other applications
  • Incorrect ComfyUI version

Q: How do I verify the workflow configuration in ComfyUI-Manager?

A: To verify the workflow configuration in ComfyUI-Manager, follow these steps:

  1. Open the ComfyUI-Manager application.
  2. Click on the "Workflows" tab.
  3. Select the workflow you want to verify.
  4. Check the workflow configuration for any syntax errors or incorrect settings.

Q: How do I update the PyTorch version in ComfyUI-Manager?

A: To update the PyTorch version in ComfyUI-Manager, follow these steps:

  1. Open the ComfyUI-Manager application.
  2. Click on the "Settings" tab.
  3. Select the "PyTorch" option.
  4. Click on the "Update" button to update the PyTorch version.

Q: How do I verify the VRAM and RAM configuration in ComfyUI-Manager?

A: To verify the VRAM and RAM configuration in ComfyUI-Manager, follow these steps:

  1. Open the ComfyUI-Manager application.
  2. Click on the "Settings" tab.
  3. Select the "System" option.
  4. Check the VRAM and RAM configuration for any issues.

Q: How do I reset the ComfyUI configuration in ComfyUI-Manager?

A: To reset the ComfyUI configuration in ComfyUI-Manager, follow these steps:

  1. Open the ComfyUI-Manager application.
  2. Click on the "Settings" tab.
  3. Select the "Reset" option.
  4. Confirm that you want to reset the ComfyUI configuration.

Q: What are the system requirements for ComfyUI-Manager?

A: The system requirements for ComfyUI-Manager include:

  • Operating System: Linux
  • Processor: Intel Core i5 or equivalent
  • Memory: 16 GB RAM or more
  • Graphics: NVIDIA GeForce GTX 1060 or equivalent
  • Storage: 1 TB or more

Q: How do I contact the ComfyUI support team?

A: To contact the ComfyUI support team, follow these steps:

  1. Visit the ComfyUI website.
  2. Click on the "Support" tab.
  3. Fill out the support form with your contact information and a detailed description of the issue.
  4. Submit the form to send it to the ComfyUI support team.

In conclusion, the black video output issue in ComfyUI-Manager can be caused by a variety of factors, including incorrect workflow configuration, outdated PyTorch version, insufficient VRAM and RAM configuration, conflicts with other applications, and incorrect ComfyUI version. By following the troubleshooting steps outlined in this article, you can resolve the issue and get back to working with video processing and analysis.

Additional Resources

For further assistance, refer to the following resources:

Related Articles