If you are trying to turn a game recording (demo) into a video:

: Libraries like pygltflib allow you to manipulate glTF 2.0 objects programmatically before rendering.

: Use the in-game console to type record .

: For better stability, render the animation as a series of PNG frames first, then use Blender's Video Sequencer to compile them into the final MP4.

: Use the command startmovie h264 to export directly to a video format, or export as a sequence of TGA images and WAV audio for higher quality.

: Tools like VirtualDub can combine these frames into a high-quality AVI, which you can then compress to MP4 using software like Sony Vegas or Handbrake .

For a visual walkthrough on managing complex 3D rigs and exporting them, check out this guide:

: Import your .gltf or .glb file into Blender. Set your render engine, then under Output Properties , select "FFmpeg Video" and set the container to MPEG-4 .