NotImplementedError when processing video frames with demo_inference.py

[itscharanteja]

I encountered a NotImplementedError while running the demo_inference.py script with a video input. The script loads the pose and YOLO models successfully, but fails during the image processing step with the following message:
===============================> Finish Model Running.
NotImplementedError()
An error as above occurs when processing the images, please check it

Steps:
PYTHONPATH=$PYTHONPATH:$(pwd) python scripts/demo_inference.py
--cfg configs/coco/resnet/256x192_res50_lr1e-3_1x.yaml
--checkpoint pretrained_models/fast_res50_256x192.pth
--video input/cycle.mp4
--outdir output
--save_video
--vis_fast

🧩 Environment Info
• Python version: 3.12
• Torchvision warning shows usage of deprecated pretrained parameter
• FFMPEG fallback due to unsupported codec h264
• OS: macOS (Homebrew + Miniconda)
• Backend: agg version v2.2
• CUDA not available, fallback to CPU

📎 Additional Notes
• The video loads, models initialize correctly, and progress reaches 100% (444/444 frames).
• Final output halts with the NotImplementedError() without a traceback.
• Might be related to vis_fast or save_video features post-processing.

Would appreciate any insights or help fixing this issue. Let me know if more logs or details are needed.