If you encounter wrong scaling of PDFs within the presenter and presentation window, you can try the:
--wayland-workaround
flag. See issues #312 and #214 for more information.
You likely have a gstreamer codec issue. In particular,
pdfpc uses the "gtksink" gstreamer plugin. On modern Debian-based systems,
it is part of the gstreamer1.0-gtk3 package; install it with:
sudo apt-get install gstreamer1.0-gtk3
Try loading the video file you want to play with the following command:
gst-play-1.0 --videosink gtksink <your video>.
If the video plays with no errors or warnings, go ahead and submit an issue. Otherwise, the command will likely
output some good hints for why gstreamer cannot decode the video.
For tiling window managers, the movement and fullscreening of the windows do not work reliably. It is therefore important to tell your WM to force floating the pdfpc windows.
If you are using i3-wm add this to your config file:
for_window [ title="^pdfpc - present" ] border none floating enable