Resolution and the fixed credit table
At 10 seconds, 480p costs 40 credits, 720p costs 90 and 1080p costs 160. At 15 seconds, the corresponding costs are 60, 130 and 240. The exact cost for your selected settings is shown before you submit.
Use 480p for an inexpensive first test, 720p when you want more facial detail, and 1080p for a higher-resolution final output. Increasing resolution cannot fix an unsuitable portrait or a conflicting prompt.
10 seconds or 15 seconds
A 10-second clip is a concise way to test a look and one small performance. A 15-second clip leaves more time for an entrance and camera movement. Both request a continuous scene with generated party ambience.
If you are comparing prompts, keep the duration unchanged between attempts. This makes the difference in wardrobe, expression or mood easier to judge.
Vertical or widescreen
Vertical 9:16 suits a phone feed and puts more emphasis on the central character. Widescreen 16:9 gives the crowd and room more horizontal space. Choose the format before generating; cropping afterward can remove useful context.
All combinations use Seedance 2.5 and MP4 output. Confirmed failed tasks restore their charged credits. You can return to My videos to check a saved task instead of submitting a second request.