examples/README.md

Examples

Every file here was produced by cortiq ltx-video reading ltx25-q4tp.cmf — one Rust process, no PyTorch, no Python in the render path. The .mp4 files carry the soundtrack the same 48 transformer blocks generated alongside the picture; the .gif files are silent previews for the model card.

clip	seed	prompt
corgi	42	A corgi in a chef hat flips a pancake in a sunlit kitchen. Warm morning light, static camera.
neon	7	Neon rain on a Tokyo side street at night, a lone figure with a translucent umbrella walks past ramen shop signs, reflections rippling in the puddles, slow dolly.
anvil	3	A blacksmith hammers glowing steel on an anvil, sparks flying, the ring of metal echoing in the workshop.
whale	11	A humpback whale glides through a shaft of sunlight in deep blue water, plankton drifting like dust, the camera rises with it toward the surface.
glass	23	Molten glass is blown into a bulb over an orange furnace, the glowing gather stretching and rotating, sparks drifting in the dark workshop.
market	5	A spice market at golden hour, saffron and paprika in open sacks, a vendor scoops turmeric and the dust catches the light, handheld camera.

All six are 384×256, 49 frames at 24 fps, eight ancestral Euler steps:

cortiq ltx-video --model ltx25-q4tp.cmf --seed 42 \
  --height 256 --width 384 --frames 49 --fps 24 \
  --prompt "A corgi in a chef hat flips a pancake in a sunlit kitchen. Warm morning light, static camera." \
  --out-dir corgi/ --out-audio corgi.wav

ffmpeg -framerate 24 -i corgi/frame_%04d.ppm -i corgi.wav \
  -pix_fmt yuv420p -c:v libx264 -crf 18 -c:a aac -b:a 192k -shortest corgi.mp4

The .wav files are the raw 48 kHz stereo the audio VAE and its vocoder produced, before muxing.

Two stages, 768×512

hq1.mp4 is the same corgi prompt at 768×512 with --two-stage: eight ancestral steps at half resolution, the learned ×2 latent upscaler, then three deterministic steps at full resolution.

cortiq ltx-video --model ltx25-q4tp.cmf --two-stage --seed 42 \
  --height 512 --width 768 --frames 49 \
  --prompt "A corgi in a chef hat flips a pancake in a sunlit kitchen. Warm morning light, static camera." \
  --out-dir hq/ 

ref1.mp4 is the reference implementation's output for the same prompt, seed and settings — PyTorch, fp8-cast weights, an NVIDIA card. It is not the same clip, and it is not supposed to be: the ancestral sampler draws its noise from a different generator, so the two are different samples of the same model rather than a reproduction. Put them side by side to judge the port on what it should be judged on — whether it renders the same kind of thing at the same quality.