gstreamer1.0-libav 1.22.4-1 (riscv64 binary) in ubuntu mantic

 This GStreamer plugin supports a large number of audio and video compression
 formats through the use of the ffmpeg 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.ffmpeg.org/
 http://gstreamer.freedesktop.org/
 http://gstreamer.freedesktop.org/modules/gst-libav.html