unoconv dropping images

I am running unoconv headless on a server (Fedora 20) to convert a LibreOffice Writer document to PDF. The conversion works without error, but the JPEG image is dropped.

I also have Fedora 20 running on a workstation (with a GUI), and the exact same unoconv command on the same file does not lose the image (unoconv -f pdf input.odt). Both the server and the workstation are completely up to date. Both are x86_64.

Is there some unchecked dependency that unoconv needs to be able to include images in a PDF?

Here is the version information for libreoffice and unoconv.