use GPU acceleration with FFMPEG

images2video.sh

# run this to turn frames into video, using a NVIDIA GPU
ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -r 30 \
  -i 'frame_%05d.png' -c:a copy -c:v h264_nvenc -b:v 50M \
  output.mp4
 
 # CPU
 ffmpeg -y -vsync 0 -r 30 \                                          
  -i 'frame_%05d.png' -c:a copy -c:v h265 -b:v 50M \
  output.mp4
  
 # CPU, with upscaling to 1080p
 ffmpeg -y -vsync 0 -r 15 \                                                           
  -i 'frame_%05d.png' -vf scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1,setsar=1  -c:a copy -c:v libx265 -b:v 50M \
  output.mp4