Install libgmerlin-avdec-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libgmerlin-avdec-doc
Description:
general multimedia decoding library (documentation)
Gmerlin_avdecoder is a general purpose media decoding library. It was written as a support library for gmerlin, but it can also be used by other applications. You don't even need gmerlin installed, only gavl. . This package provides the API documentation for Gmerlin_avdecoder.
Homepage: http://gmerlin.sourceforge.net/
Version: 1.2.0~dfsg-9build2
Section: universe/doc