IAMCCS Cine LTX Sequencer (legacy alias)

If you've used the LTX Keyframer, you know it inserts stills into the latent but leaves your text conditioning alone. IAMCCS Cine LTX Sequencer (legacy alias) is the bigger sibling: it does the keyframe insertion and adds the guide stills to your positive/negative conditioning, so the text and the images pull in the same direction. One node, both sides of the conditioning.

What it does

Inputs:

• positive / negative - your LTX conditioning; the guide keyframe info gets added to both.
• vae, latent, multi_input - same roles as the Keyframer: encode the stills, insert into the video latent.
• num_images - how many per-image widget sets to show (up to 50).
• insert_mode - frames (default) or seconds. This is the sequencer's party trick: position your stills by explicit frame number, or by second.
• frame_rate (24) - only used when insert_mode is seconds, to convert times to frames.

Then per image (up to 50): insert_frame_N and insert_second_N (whichever matches your mode) plus strength_N - how strongly that still anchors both the latent and the conditioning.

Outputs: positive and negative (conditioning with guide info baked in) and latent (the video latent with added guides).

How it works

For each still it encodes the image with the video VAE, places it in the latent at the chosen frame, and folds a guide representation into the conditioning pair. Same underlying keyframe trick as the Keyframer, plus the conditioning pass that the Keyframer skips. The seconds mode is the workflow-friendly one - you plan a board in seconds ("hero shot at 2s, closeup at 6s") and let frame_rate do the conversion, which is a lot less error-prone than counting frames by hand in a 30fps clip.

Where it fits

Reference Board → Sequencer → sampler. Because it touches both the latent and the conditioning, it's the one to reach for when the stills are meant to be real beats in the scene rather than just spatial anchors. The IAMCCS_WDC_* prefix marks it as part of the legacy-compat family that keeps old IAMCCS Cine workflows loading; the wiring is exactly what those workflows expect.

Installing it

Part of IAMCCS-nodes. ComfyUI Manager (search "IAMCCS") or:

cd ComfyUI/custom_nodes
git clone https://github.com/IAMCCS/IAMCCS-nodes.git

Restart after. Needs a working LTX Video + video VAE setup in ComfyUI; adds no model files itself.

Common issues

If you switch insert_mode to seconds and the stills land at weird spots, check frame_rate first - it's the conversion factor and it defaults to 24, which is wrong for a 30fps clip. And a subtle one: with frames mode, insert_second_N is ignored (and vice versa), so only the pair matching your mode actually does anything. When a still doesn't show up at all, it's the same silent-no-op as the Keyframer - an insert position past the clip's length just doesn't fire.