Frame Control: First, Last, and Transitions
- →Build all three image-to-video request shapes - first frame, last frame, and first & last - with correctly labeled roles
- →Predict ratio behavior in i2va mode, including what happens to an explicitly passed ratio value
- →Decide when frame control is the right tool and when reference generation would serve the shot better
Text-to-video gives the model total freedom; frame control takes some of it away on purpose. Pin a first_frame and you have dictated exactly where the clip begins. Pin a last_frame and you have dictated where it must arrive. Pin both and the generation's job is reduced to the most cinematic problem there is: get from this image to that one, plausibly, in the time allowed.
The three request shapes come straight from the documented combinations, and you already know the grammar from lesson 1:
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