Every video comes with original music. The video type sets how the visuals behave:
Lite: a still scene with music. Lightest on credits.
Plus: gentle motion at 1080p. The sweet spot for most channels.
Ultra: full motion at up to 4K. Available on Pro and Max plans, for videos of 10 minutes or longer.
Any type can run up to 1 hour, on every plan.
Music costs 1 credit per track, and a track covers roughly 2 to 3 minutes. Visuals are a one-time cost per video: 4 credits on Lite, 36 on Plus, 135 on Ultra.
10 minute Lite: about 8 credits
30 minute Plus: about 48 credits
1 hour Plus: about 59 credits
1 hour Ultra: about 158 credits
The exact number always shows in Studio before you generate.
To redo one layer of a finished video without paying for the whole thing, see Re-roll music, visuals or the thumbnail.