Is it possible to upgrade Gstreamer and libx264 on Ubuntu 18.04?

Solution 1:

Yet, it is possible. Use the following PPA for both x264/x265 and GStreamer:

sudo add-apt-repository ppa:savoury1/ffmpeg4
sudo add-apt-repository ppa:savoury1/multimedia
sudo apt-get update
sudo apt-get dist-upgrade

Reverting is possible by

sudo apt-get install ppa-purge
sudo ppa-purge ppa:savoury1/ffmpeg4
sudo ppa-purge ppa:savoury1/multimedia

You can always use both Y PPA Manager or visit https://launchpad.net/ubuntu/+ppas to do a search by yourself.