ac 1.1 has been released : linux
Short reply: Because there was no FFmpeg after I began engaged on fre:ac.
The preliminary public launch of FFmpeg predates the preliminary launch of BonkEnc (which later grew to become fre:ac) by only some months. When I began engaged on an audio converter, there merely was no FFmpeg.
Also, FFmpeg was not viable as an audio converter within the first years. Its focus was on video conversion. Support for codecs like MP3 or AAC was added solely later.
And nonetheless at present, FFmpeg is missing in a number of areas which might be extra vital to audio than to video, like tagging, chapter assist for audio-only codecs and gapless audio.
However, fre:ac truly makes use of FFmpeg to offer assist for some unique codecs (and a few not so unique ones for which there aren’t any different codecs for Linux, like WMA). With fre:ac’s part system, it might even be potential to take away all of the non-FFmpeg based mostly parts and exchange them with FFmpeg-invoking scripts. Then you’d have an FFmpeg-based fre:ac after just some hours of labor.