Hello @kosua20, thank you for creating such an easy and great midi visualizer tool. The image export function works perfectly for me. The problem I encountered is that the program died immediately every time I tried to export a video version. The device I used was macOS version 10.12.6.

Here is the error I received: https://docs.google.com/document/d/1tVFp314IcghNLiiYb2z1nEwR4yzZUxl6xtDafsmDLkQ/edit?usp=sharing

I look forward to your reply. Thank you so much!