Here is one thing you can try for audio stutter. Raspberry Pi does not play nice with pulseaudio.
So in VLC go to “tools” then " preferences" and click on the Audio tab.
under “output Module” it will probably be “Automatic” Change it to “Alsa audio output”
Then under device, change it to whatever the audio device name is. I’m sorry, I am working on the installer and I don’t have a working Raspberry Pi 4B up and running at the moment.
But you can in a terminal, type alsamixer. Then F6 and it should list the audio devices. Make “device” in VLC match what is shown in alsamixer. Reboot.
Try that, then we will go from there.
EDIT:
Come to think of it, there is a Topic on this with screenshots.
Pudge