The specific method for MMD to export HD video is as follows:

1. Click to open MMD software, select the "File" option in the upper left corner of the software, and select "Export AVI file" in the drop-down menu.

2. Set the file saving path and file name, and click "Save".

3. Set the AVI output in the pop-up window, and enter the frame rate and recording frame (from the start frame to the end frame, it is best not to choose the import wave, otherwise it will get stuck at about 5000 frames).

4. Set "Video Compression Coding" and select "Uncompressed" (uncompressed coded pictures will not be destroyed).

5. After setting, click "OK" and wait for the software to export the video automatically.