Image Batch Assembler

Short version: ImageFrameSelector and Image Batch Assembler are the same node. If you're seeing this page because a workflow you downloaded references "ImageFrameSelector", you've hit a compatibility alias - and there's nothing to install separately or fix. Let's unpack why it exists, because it affects how you should read the pack.

The pack is ComfyUI Image to Video Inserter by Yeq6X. It's a small, recently-released collection focused on inserting still images into video frames. Early on, the author shipped the image-collection node under the name ImageFrameSelector. Later it got renamed to ImageBatchAssembler - but renaming a node breaks every existing workflow that saved the old name into its JSON. So the pack registers both:

• ImageBatchAssembler → the current node, display name "Image Batch Assembler"
• ImageFrameSelector → a compatibility alias pointing at the same class, also displayed as "Image Batch Assembler"

The source is explicit about it: the mapping entry is literally "ImageFrameSelector": ImageBatchAssembler with a comment calling it a backward-compatibility alias for existing workflows.

What this means in practice

• If a saved workflow references ImageFrameSelector, it still loads and runs. The alias resolves to the same code. You don't need to hunt down an old version of the pack.
• If you're searching for the node in the menu, use "Image Batch Assembler." That's the display name for both, and it's what new workflows should save. When you add the node fresh, you'll get the current name.
• Everything the assembler does, this node does. Dynamic image inputs via inputcount + the "Update inputs" button, output_type of list or tensor, and resize_mode (pad / fit_short_side / cover_fill) for squaring up mixed-size inputs in tensor mode. Same function, same inputs, same output.

There's nothing here you configure differently because of the name. It's the exact same box wearing two labels.

Installing it

You don't install "ImageFrameSelector" - you install the pack and both names come along:

cd ComfyUI/custom_nodes
git clone https://github.com/Yeq6X/ComfyUI-image-to-video-inserter

then restart ComfyUI (or use ComfyUI Manager, search "Image to Video Inserter"). No weights, no keys. And since it's a pure-compatibility alias, there's no separate update path - when the pack updates, both names update.

When to reach for it

Reach for this page when you're decoding an error message or a missing-node warning that mentions ImageFrameSelector and you're not sure what it is. The fix is almost always "that's the assembler, it's fine." If you're starting fresh, ignore this name entirely and add Image Batch Assembler to your graph. This node is a reminder that ComfyUI's ecosystem is full of these rename aliases - the reason they exist is that real workflows in the wild get saved with old names, and a good pack keeps them loadable instead of breaking you.