If you have 120 PNG images, the file size would probably become quite large. Why don't you create an MP4 video instead?
First, name your images padded with zeros. For example, pic0001.png, pic0002.png, etc. Then, run this ffmpeg command:
ffmpeg -r 60 -f image2 -s 1920x1080 -i pic%04d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p test.mp4
If you don't have ffmpeg, you can download it here: https://ffmpeg.org
Perhaps this is not the solution you're looking for, but since you said ALL suggestions are welcome