PRO Feature - Video export requires a PRO subscription. Upgrade to PRO for access.Video Export Export your trajectory animations as high-quality MP4 videos for presentations, publications, or supplementary materials.
Getting Started
Load a multi-frame trajectory (.gro file with multiple frames)
Open the EXPORT panel
Click Export Video
Configure your export settings
Click Start Export
Export Settings Setting Options Description Frame Range Start / End frame Select which portion of the trajectory to export Step 1, 2, 5, 10… Skip frames for faster exports (step=2 exports every other frame) FPS 10, 15, 24, 30 Playback speed of the output video Resolution Width x Height Output video dimensions Quality Low / Medium / High / Ultra Video compression level Render Mode WebGL / Path Tracer Standard rendering or photorealistic path tracing Loop Count 1, 2, 3… Repeat the animation for longer videos
Quality Levels Quality CRF Value Best For Low 28 Quick previews, small file size Medium 23 General use, good balance High 18 Presentations, high clarity Ultra 12 Publications, maximum quality
CRF (Constant Rate Factor) controls H.264 compression. Lower values = higher quality but larger files.
Export Process The export runs in two phases:
Phase 1: Frame Rendering Each frame is rendered and captured as a PNG image. A progress bar shows the current frame and estimated time remaining.
Phase 2: Video Encoding All frames are encoded into an MP4 video using H.264 codec via FFmpeg (running in the browser via WebAssembly). A second progress bar tracks the encoding progress.
Path Tracer Mode When using Path Tracer render mode, each frame is rendered with the specified number of path tracing samples. This produces photorealistic output but is significantly slower.
Samples Quality Speed 64 Preview Fast 128 Good Moderate 256 High Slow 512 Publication Very slow
Path-traced video export can take several minutes to hours depending on frame count and sample settings. Use standard WebGL mode for quick previews.
Output The exported MP4 file is automatically downloaded with a descriptive filename:
clavis_frames_1-100_24fps_high.mp4
The naming format is: clavis_frames_{start}-{end}_{fps}fps_{quality}.mp4
Tips
Preview first : Use Low quality with a small frame range to check the result before a full exportEven dimensions : The exporter automatically ensures even width and height (required for H.264)Cancel anytime : Click Cancel during either phase to abort the exportLoop for GIF-like effect : Set loop count > 1 to create seamless repeating animations 
