[Audiophile1811]

Hi. Does anyone know of a good, safe, efficient bit rate converter online? One that can convert any audio files like mine, which are 128 kbps and 320 kbps, into proper 320kbps, LOSSLESS audio files. Mine are all AAC.
Can anyone recommend a decent program? 
Thank You, A1811. 

 

[Roseval]

[size=medium]Converting to another format is supported by Foobar, J River, dbPoweramp, etc.[/size]
 
[size=medium]I most of all wonder what you wish to obtain.[/size]
[size=medium]If you rip a CD to 128 kbs you reduce the audio from 44.1 kHz X 16 bit X 2 chan. = 1.411 kbps to 128 kbbs.[/size]
[size=medium]So a lot of information is thrown out.[/size]
[size=medium]You can transform this 128 kbps to any other format say a 16 bit, 44.1 WAV or even 24 bit / 192 kHz WAV but what is lost in the lossy compression to 128 is lost definitely.[/size]
[size=medium]You wont improve sound quality by doing so.[/size]
 
[size=medium]BTW: 320 kbps is not lossless, it is the highest bitrate supported by lossy formats like MP3.[/size]

 

[Ham Sandwich]

There is no way to upconvert a lossy music file to a higher bitrate or to lossless and do so in a manner that would be in any way better or proper.  Lossy is exactly that and what is lost when compressing the file cannot be recovered.  There are no magic algorithms that can recreate what was taken away (lost).
 
So once a file is 128 kbps AAC it can never be upconverted to better quality.  It's stuck where it is.  There are programs that will make a 128 kbps file into a 320 kbps file, but the audio quality will be the same as, or possibly even worse, than the original 128 kbps file you started with.
 
Your only solution to get 320 kbps lossy files or to get lossless files is to re-rip from CD or other lossless source.
 
It's not clear from the way you worded things, but 320 kbps is not lossless.  Lossless formats like ALAC or FLAC will compress to around 500 kbps to 1000 kbps typically, depending on the complexity or compressability of the music.  Classical music will compress more.  Rock music will compress less.

 

[xnor]

(Lossy to lossy) transcoding is frowned upon since it will only reduce quality.
 
Ideally you rip CDs to a lossless format and use that as source for lossy formats like mp3 (for your car stereo, portable player ..).
 
Take a look at foobar, it's a very versatile player and can be used to convert from pretty much any format to any other.