No video with supported format and MIME type found

The title above says it all. This issue is occuring in Firefox on Fedora Matay. Issue displayed in Storyblocks but also happened in Instanavigation and Instagram. Not in issue when i was in GNOME. i tried doing research and firefox’s solution was almost 10 years ago and the instructions are no longer relevant due to changes.

What would be the ideal solution to this?

EDIT 19:48 ET 27 SEP: It also displayed in Purism (Open-Source phone company)

I’d try installing:

gstreamer1-plugin-openh264 openh264 mozilla-openh264

is there something im supposed to do prior? because it says that the command is not found both as regular and as sudo.

Those were the packages but you’ll need to install them with dnf:

sudo dnf install gstreamer1-plugin-openh264 openh264 mozilla-openh264

That worked. what happened was you put them in 1 line instead of 2.

Im marking this one as solution instead of the one above to avoid confusion.

Step 1: sudo dnf install gstreamer1-plugin-openh264
Step 2: openh264 mozilla-openh264

1 Like