spline-to-video.md

Making Video from 3D Spline model

1. Spline Video export: https://www.youtube.com/watch?v=OgN8TZElx6M&t=130s
   • Export as image sequence.
   • Trick: set 15 fps with 0.5x speed then create video with 30 fps.
2. Convert to video:

   # Remove redundant images from image sequence
   ls -1 *png # then use bash in vim normal mode to remove all superfluous images
   # resize
   mkdir resized && for f in *.png; do ffmpeg -i "$f" -vf scale=150:-1 "resized/$f"; done
   # mp4
   ffmpeg -framerate 30 -pattern_type glob -i '*.png' -crf 20 -preset veryslow -pix_fmt yuv420p -c:v libx264 out.mp4
   # webm
   ffmpeg -framerate 30 -pattern_type glob -i '*.png' -crf 30 -preset veryslow -pix_fmt yuva420p -c:v libvpx-vp9 out.webm

   • Change -crf 30 to increase/decrease quality/size.
   • https://stackoverflow.com/questions/34974258/convert-pngs-to-webm-video-with-transparency
3. Create cover by converting last frame to webp:

   # Lossless
   convert -format webp -quality 100% 483.png 483.webp # sudo apt-get install imagemagick
   # Compressed
   convert -format webp -quality 99% 483.png 483.webp # Changing 99% to 0% doesn't make any difference

   Take the last image from the image sequence, i.e. the highest number from $ ls *png.