Merge multiple video clips into one seamless film. Frame-perfect joins, smooth crossfades, and audio mixing ā all powered by GPU-accelerated ffmpeg.
From individual scenes to one continuous film ā every step optimized for speed and quality.
Scene Builder outputs individual MP4 clips ā each one a fully rendered scene with 3D OpenGL transitions, motion graphics, and audio. These are the building blocks for your final film.
The core engine. GPU-accelerated ffmpeg concatenates all scene clips into one continuous video file. Frame-exact joins with zero quality loss. Handles varying resolutions, frame rates, and codecs seamlessly.
ffmpeg mixes background music (from Music Generator), narration audio (from AI Narration), and scene audio into a balanced final soundtrack. Volume normalization, ducking, and crossfade transitions are handled automatically.
The completed film is exported as a single H.264 MP4 file ā optimized for YouTube upload, local playback, or further processing in YouTube SEO and Thumbnail Maker. Includes metadata tagging, chapter markers, and closed caption track.
A deep dive into the concatenation engine that powers your final film exports.
ffmpeg concat demuxer ensures frame-perfect joins between clips. No black frames, no audio pops ā just seamless transitions at every cut point.
Optional fade-in/fade-out between clips using the blend filter. Customizable duration per transition via the Scene Builder settings panel.
Background music, narration, and scene audio are mixed into a balanced final track. Auto-ducking lowers music during narration for clarity.
Automatically scales all clips to the target output resolution (4K or 1080p). Handles mixed aspect ratios with letterboxing or cropping as configured.
Uses NVIDIA NVENC or AMD AMF hardware encoders for blazing-fast export speeds. Concatenation is 3-5Ć faster than CPU-only ffmpeg.
Automatically embeds chapter markers at each scene boundary. Adds title, description, and thumbnail metadata for YouTube and local playback.
Simple, predictable pricing ā pay per scene you merge.
š” Combined Pipeline: A full 3-scene project through the entire pipeline ā Story Maker (36cr) + Concat (9cr) + AI Narration (28cr) + YouTube SEO (2cr) + Thumbnail Maker (10cr) ā totals approximately 85 credits. On the Monthly plan (25,000cr), that's ~295 fully-produced films per month.
Concatenate is the glue that brings everything together. Scene Builder outputs, AI Narration tracks, and Music Generator scores all merge here into one polished master file.
Pulls clips directly from your project's Scene Builder directory
Automatically aligns audio from AI Narration and Music Generator
Output MP4 is optimized for direct upload via YouTube Upload tool
One click. Frame-perfect joins. Your film, ready for the world.