[15:01 Thu,18.July 2024 by Thomas Richter] |
Actually, the Bullet Time effect, made famous by "The Matrix" (www.studiobinder.com/blog/what-is-bullet-time-definition/), typically requires a complex setup with multiple cameras: in the midst of a very dynamic scene, time seems to suddenly stand still or move extremely slowly, with only the camera moving and changing its perspective. ;)
However, YouTuber MMA Chopper Monster has found a simple alternative. He innovatively uses the new Keyframe feature in Luma AI (www.luma-ai.com/luma-keyframes/), which allows users to input a start and end frame. The AI then generates all the frames in between as a video clip. With the right images (sometimes even just the start image) and the appropriate text prompt, short Bullet Time sequences can also be generated. MMA Chopper Monster demonstrated his technique using clips from an MMA fight and kindly posted a description of his workflow on Reddit, which can help other users with their experiments. It&s great that Luma AI also offers 10 free video generations per day. Bullet Time Guide for Luma AI To achieve an optimal Bullet Time sequence, you need two photos of a scene from different perspectives taken at the same moment (or at least with minimal time lag). These should be as closely aligned as possible so that the main content is similarly positioned in the frame. It can also be helpful to remove unnecessary objects from the images (e.g., using the "Generative Fill" function in Photoshop) so the AI doesn’t accidentally animate them. In Luma AI, these images are then entered as the start and end frames (using the new End-Frame option). If you only have one image, just the start frame will suffice, but the results won&t be as good. Start Frame When using only one image, it is recommended to use prompts that tell the AI that the main object of the Bullet Time sequence should remain still and only the camera perspective should change: "wax sculpture fighters, 360 degrees camera shot", "still sculpture fighters, bullet time shot", "wax sculpture", "wax figure" – the typical camera movement is prompted by "360 degrees camera shot" and "bullet time shot". Start Frame and End Frame When working with two images (i.e., start and end frame), similar prompts to those used with a single image can be used. In some cases, Luma automatically detects that an Arc Shot is needed to transition from the start image to the end image. To achieve optimal results, the generation may need to be repeated 3-4 times per scene. According to MMA Chopper Monster, the "360 degrees camera shot" prompt often works better than "arc shot" – he recommends experimenting with different formulations and settings to get the best results. The AI-generated Bullet Time sequences in the demo clip are very short, but the continuous improvement of video AI capabilities will allow for longer clips in the future (also in other video AIs). Here’s the original Bullet Time effect in The Matrix: Bild zur Newsmeldung:
 more infos at bei www.reddit.comdeutsche Version dieser Seite: Bullet Time Effekt einfach selbst gemacht per Video-KI |
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