Install gstreamer1.0-libav by entering the following commands in the terminal:
sudo apt update sudo apt install gstreamer1.0-libav
Description:
libav plugin for GStreamer
This GStreamer plugin supports a large number of audio and video compression formats through the use of the libav library. The plugin contains GStreamer elements for encoding 40+ formats (MPEG, DivX, MPEG4, AC3, DV, ...), decoding elements for decoding 90+ formats (AVI, MPEG, OGG, Matroska, ASF, ...), demuxing 30+ formats and colorspace conversion. . http://www.libav.org/ http://gstreamer.freedesktop.org/ http://gstreamer.freedesktop.org/modules/gst-libav.html
Homepage: http://gstreamer.freedesktop.org/modules/gst-libav.html
Version: 1.14.0-1
Section: universe/libs