[direwolf-pgh]

perhaps Im not reading your question correctly...but..

mp3, ogg, shn, flac are all compression methods for the SIZE of the file.

lossy or lossless source -when you burn out an audio CD the TIME length of the tracks are exactly the same - any source file would take the same amount of space on the CD-R media - a standard CD-R offers roughly 80 mins of music - standard red book format.

if you are creating an mp3 CD..a lossy CD of music.. yeah..you could lower the bitrate to gain more space for tracks/songs ... because you are burning data files to a disk.