twolame is about to be added to Fedora (bug #1533719). Once in, Suggests: twolame should be added to abcde.spec for MP2 encoding support.
twolame is now in rawhide and F27, and a buildroot override is currently in place for the latter.
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle. Changing version to '28'.
abcde-2.8.1-5.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-0f2e0a5f5c
abcde-2.8.1-5.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-0f2e0a5f5c
abcde-2.8.1-5.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.