Greater loss of bitrate when converting from 256 kbps AAC to 128 kbps AAC
Hi everyone,
I had over 800 MP3s of various bitrates which I converted to 256 kbps AAC format in iTunes, in order to standardise them all, then deleting the originals. However, I was then told by a friend that if I simply reconverted the new ones to 128 kbps but still saving them in AAC format, I would save on half the disk drive space. Since memory is at a premium on my computer, I did just that but the results in iTunes show that the songs have since turned out in various different bitrates again, ranging from 99 kbps to 103, 105, 107, 123 etc. The settings in Preferences are as I left them, AAC Encoder with High Quality (128 kbps). I realise that this is not such a big issue in terms of listening and playback but I am curious as to why iTunes has decided to dictate the individual bitrate for each song despite my settings. Any comments or feedback would be much appreciated, thanks!
I had over 800 MP3s of various bitrates which I converted to 256 kbps AAC format in iTunes, in order to standardise them all, then deleting the originals. However, I was then told by a friend that if I simply reconverted the new ones to 128 kbps but still saving them in AAC format, I would save on half the disk drive space. Since memory is at a premium on my computer, I did just that but the results in iTunes show that the songs have since turned out in various different bitrates again, ranging from 99 kbps to 103, 105, 107, 123 etc. The settings in Preferences are as I left them, AAC Encoder with High Quality (128 kbps). I realise that this is not such a big issue in terms of listening and playback but I am curious as to why iTunes has decided to dictate the individual bitrate for each song despite my settings. Any comments or feedback would be much appreciated, thanks!
Comments
I think your biggest problem is the repeated conversions where you're losing quality along the way at each step.
For my own use I leave files in the format I get them in unless I've got the source to use for re-encoding.