Important Suggestions for Rendering Videos Over 200 Frames

Rendering long videos (above 200 frames) can be challenging in ComfyUI. To ensure success, follow these guidelines:

1. Remove the "Video Combine" Node. Instead, use the "Save Image" node.

Reasons for Removing the 'Video Combine' Node

• ⚠️ The VHS Video Combine node often crashes silently when processing hundreds of frames (200+), depending on the resolution. Therefore, removing it would be safer.
• You cannot place both the "Save Image" node and the "Video Combine" node at the same level, as the execution order might be uncertain to you. The VHS node might run first and crash, preventing the "Save Image" node from executing.
• To determine the execution order, use ComfyUI-Manager:

  • Turn on the Badge: #ID Nickname.

  • A small number will appear on top of each node in your workflow. Nodes execute in ascending order based on these numbers if they are at the same level.

    

2. Output Path Configuration

Please see the detailed information here:

⚠️ How to Save Image/Images by Path in ComfyUI?

⚠️ Make sure you set the correct path, or you will not find the result in the file browser.

3. Use Meta Batch Manager

ComfyUI-VideoHelperSuite has this nice node that works very well with splitting video frames into batches thus less stress on the RAM and VRAM.

• Add “Meta Batch Manager” Node into the workflow, connect it to Load Video node and Video Combine node. 64 frames is a good starting value to test out the batch size.

  

• Best use case for Meta Batch Manager

  • It works well with models that do not require a context, for instance, upscaling models, face detection and SAM2, etc.
  • But not so well for models that need context, video to video transformation/restyle, etc. Of course you should test it out and see if you need to do some stitching when you must use batching due to limited resources.

4. Limiting the Number of Frames