"Unsupported Codec" Errors

Running Linux Mint 18.04, and Natron 2.3.14 ()from the linux mint repository)

When I try to create either a Read node for a video, or a write node, I get an “unsupported code” error.

I installed ffmpeg, thinking that might be the issue, and even rebooted the machine afterwards, but the errors persist.

How can I fix this?

Do you have any plugins installed? Note that we only support official binaries.