I don’t know if ffmpeg can transcode for a certain format, but the Substreamer and Ultrasonic can be successfully transcoded under basic transcoding commands, but the interface experience is not as good as Symfonium.
My music library mainly has two music formats: dsf and flac. After transcoding is configured in Navidrome, neither format can be transcoded. It’s just that flac can be streamed directly so it can be played directly. After the maximum bit rate is limited in the APP settings, both formats will be transcoded to opus.（By the way, I’m sorry that I’m not a native speaker of English, so some expressions are not very clear.）
My knowledge of ffmpeg is insufficient. By looking up related documents and configurations in navidrome, I concluded that “-b:a” is a parameter to set the bit rate. So I set a fixed value of 1400.
Anyway, I’m glad you can answer my question. I still hope that symfonium can call navidrome’s transcoding and drag the progress bar.
another question：Can symfonium display the lyrics of the .lrc file？