Asunder contains option to use proprietary encoders

The version of Asunder included in the repositories for Trisquel 5.0 includes an option to use proprietary encoders to encode audio. It doesn't work; checking the box produces an error message saying that the encoder isn't installed. It probably isn't a big deal, since Trisquel wouldn't have those encoders in the repositories anyhow, but I thought it might be worth mentioning.