From the newly rendered output directory, run FFmpeg with libx264 support:

ffmpeg -framerate 24 -start_number 1 -i frames/proxy-%04d.png -frames:v 48 -c:v libx264 -crf 18 -pix_fmt yuv420p -movflags +faststart -an world-proxy-study.mp4

Original silent Blender proxy, not a Mundo model output. Forty-eight frames at twenty-four frames per second make a two-second file.