: Use the in-game console to type record .

: 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 .

: 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.

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

: 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 .

To "produce" the file generally refers to one of two things: exporting a Team Fortress 2 (TF2) demo as a video file or converting a glTF 2.0 3D model into an MP4 animation. 1. Converting TF2 Demos to MP4