Long ago, before I switched to FLAC, I ripped a bunch of albums to MP3. All of the "important" albums have been re-ripped as FLAC, but I still have a bunch of mp3s that I don't want to re-rip. Unfortunately, I somehow ripped them using an unsupported sample rate. I know that the supported sample rates are 11, 22, and 44.1 KHz.
My question is, what is the best method of converting files to a different sample rate? I know that I can re-encode them but I really don't want the music to go through two stages of compression. Is there some way to up-sample to a supported sample rate without performing a decompression / recompression on the files?
Thanks in advance for any help.