Text-to-Video vs Image-to-Video: Impressive Demos vs Practical Usability
EntireBig7258 · reddit · 2026-08-06
Based on recent testing, the author points out that while text-to-video and image-to-video are often lumped together, their actual performance and underlying challenges are fundamentally different.
- Text-to-Video: Yields the most impressive demos but is the least trustworthy. Since the model invents geometry and motion from scratch, physics and object permanence break down quickly. In tests with Runway, faces warped and limbs did impossible things within seconds.
- Image-to-Video: The boring option that actually works part of the time. Constrained by the existing geometry in the source image, the first second or two tends to hold together. Testing with APOB AI showed the face stayed locked initially before expression consistency degraded, requiring trimming before the drift became obvious.
The author concludes that neither approach is solved; they are just broken in different, predictable ways. Knowing which mode you are using tells you which failure to expect.
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