My first thought was to add these extra libraries to the CMAKE_EXE_LINKER_FLAGS variable. This is not the place, because the expansion of this variable is included at the wrong point in the final link command, where they will not be used to resolve undefined symbols in the FFmpeg libraries. As a result, your link will fail.
To ensure these libraries are included at the right place, put them on the end of the FFMPEG_LIBRARIES value, after the FFmpeg libraries proper. They will similarly be included immediately after the FFmpeg libraries in the link command, thereby correctly resolving the necessary symbols.
For example, my FFMPEG_LIBRARIES definition currently looks like this (all on one line):
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