How to control the video length ?

[SIFOR-GAMES]

Hello everyone sorry for the noob question may I know how is it possible to control the video length of the prompt result?

[honeybansal9]

@SIFOR-GAMES to change the video length you need to increase the num_interpolation_steps so if your num_interpolation_steps=5 then your video length will be 1 sec and you can increase it in the multiples of 5. This is how I discovered by changing num_interpolation_steps=30 the video length gets changed to 6secs.

[SIFOR-GAMES]

Thanks

[nateraw]

@honeybansal9 is on the right track but here's a more in depth explaination...

num_interpolation_steps - the number of frames to generate in between each prompt. The default is 5. If its an int, it gets turned into a list that's one item shorter than the provided prompts/seeds. Heres the line that does that:

stable-diffusion-videos/stable_diffusion_videos/stable_diffusion_pipeline.py

Line 768 in 6162a04

num_interpolation_steps = [num_interpolation_steps] * (len(prompts) - 1)

the fps parameter (which defaults to 30), is the frames per second of the output video we generate.

If you were to divide the sum of num_interpolation_steps list by fps, you'd get the duration.

Now that we know that, and we have some desired duration (in this case 5 seconds) and fps (using the default of 30), you could do something like this...

prompts = ['a cat', 'a dog', 'a horse']
seeds = [42, 1234, 5321]
desired_duration = 5.0
fps = 30

total_frames_to_generate = desired_duration * fps
# >>> 150.0
num_interpolation_steps = int(total_frames_to_generate // (len(prompts) - 1))
# >>> 75
# this means 75 frames between 'a cat' and 'a dog'
# then 75 frames between 'a dog' and 'a horse'

# Then use the computed value to generate your video
pipe.walk(prompts, seeds, num_interpolation_steps=num_interpolation_steps, fps=fps)

hope this helps 😄

[SIFOR-GAMES]

Thanks got it... appreciate it !