recently bought some eJay software to mess around with,problem is the majority of my music library is compressed in AAC (itunes!) and the software only imports MP3,WAV,WMA...
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As the flames rose,
To her Roman nose,
And her iPod started to melt......
iTunes can do it. The default setting is AAC, but it also does mp3, wav, aiff and apple lossless.
Change your iTunes prefs to mp3 under theiTunes menu- preferences- advanced- importing. Then in your library or playlist select the tracks you want to convert, then go to the "Advanced" menu and "convert selection to mp3".
iTunes can do it. The default setting is AAC, but it also does mp3, wav, aiff and apple lossless.
Change your iTunes prefs to mp3 under theiTunes menu- preferences- advanced- importing. Then in your library or playlist select the tracks you want to convert, then go to the "Advanced" menu and "convert selection to mp3".
excellent,thanks,hel p greatly appreciated.
__________________
And now i know how Joan of Arc felt,
As the flames rose,
To her Roman nose,
And her iPod started to melt......
for the record, AAC is better than mp3. AAC is lossless (no information is lost) whereas MP3 are lossy, some of the information content is lost each time you encode it.
history lesson: AAC was developed by the same guys who developed MP3, only they developed it *after*.
you would be better off keeping AAC copies, and encoding any new audio you get using AAC codec. make duplicates for encoding as MP3s for eJay.
libflac for *nix. 'tis great. and free.
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Incorrect. AAC is MP4. It uses the same concept as mp3- sounds that are masked to the human ear are discarded. It removes information from the audio to reduce the file size. It does this better than mp3, sure, but it is not lossless! On good speakers there is still an audible difference between CD and mp4.
Incorrect. AAC is MP4. It uses the same concept as mp3- sounds that are masked to the human ear are discarded. It removes information from the audio to reduce the file size. It does this better than mp3, sure, but it is not lossless! On good speakers there is still an audible difference between CD and mp4.
no.
MP4 is nothing more than a container file. (the standard based on / copied from apples .mov container format)
you could encode audio with AAC and stick it into a .MOV or as an audio track in an .OGM. or of course, you can stick it into an MP4 container, along with the rest of the album along with some movies.
i was confusing flac with aac.
i'll never make that mistake again.
i promise.
also, you have to take in to account bitrates and all that. so whilst the audio may be encoded with a lossy codec, there may have been more information content in the original audio than human ears can pick up, and it's also possible that there is still more information in the compressed audio than the human ear can make out.
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MP4 is nothing more than a container file. (the standard based on / copied from apples .mov container format)
Technically correct I suppose, but not in the context of the question- iTunes AAC is definitely compressed.
Quote:
Originally Posted by thread_killer
so whilst the audio may be encoded with a lossy codec, there may have been more information content in the original audio than human ears can pick up, and it's also possible that there is still more information in the compressed audio than the human ear can make out.
Again, technically correct. But the research into what we can and cannot hear is not definitive- there is an error margin, just like any other theory. The human ear is very sensitive, and a trained ear even more so. The speakers and room used to listen to the music is a hugely significant factor also. I, and many other musicians and engineers I know, can identify when the audio source is perceptually coded (as in mp3/4, DTS, AAC, Dolby Digital, etc.).
long story short, i was confusing flac (libflac) with faac (libfaac / libfaad). and to weave back on topic, you would have to recommend using AAC instead of MP3 as long as "device compatibility" wasn't an issue to you. especially when they are both lossy. it wouldn't be good to re-encode all the AACs as MP3, as they are already compressed using a lossy codec, uncompressing them only to compress them again using a slightly more lossy codec is just trimming off more audio quality that needs to be cut.
Quote:
But the research into what we can and cannot hear is not definitive- there is an error margin, just like any other theory.
i know you are talking about audio quality here, but it's known that you can't hear things above 20KHz and below 20Hz on average. you can however generate, record, encode, and play audio (on specially build speakers) that is above or below this frequency. but again, i know you were refering to sounds we can hear, and how an ear would hear. the speakers and room would be very important alright. i prefer headphones. links for anyone who is bothered http://forum.doom9.org/showthread.php?s=&threadid=62723http://forum.doom9.org/showthread.php?t=73022
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and to weave back on topic, you would have to recommend using AAC instead of MP3 as long as "device compatibility" wasn't an issue to you. especially when they are both lossy. [snip] but it's known that you can't hear things above 20KHz and below 20Hz on average. you can however generate, record, encode, and play audio (on specially build speakers) that is above or below this frequency.
Topic weaving indeed!
OK, what I should have said is that AAC is not lossless. And you are right about mp4 of course, I was wrong there.
The original poster wanted to get his/ her music from iTunes into something else to "mess about". We have facilitated this messing about. I'm sure he/ she will hear the bad sound resulting from two stages of lossy compression at the default bit rates in iTunes- if not, he/ she will always be just "messing about" with music. This is not a bad thing.
Perceptual coding uses theory on perception of sound. It is not a perceptual matter that we cannot hear above 20kHz or so, or below 20Hz or so- in fact, our ears are not physically capable of responding to those frequencies. Perceptual coding utilises the way our brain interprets the signals from the ears as a way to reduce file sizes. No perceptual codec is concerned with anything outside the 10Hz to 20kHz range.
Yes, there is test equipment that can sense and reproduce audio outside our hearing range, but it is of no use in the every day world of audio... and completely off topic, but who cares, that's what forums are for!
Converting AAC
Linear Mode
