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Originally Posted by Shauk
see I always wondered about the truth to that.
My understanding is that there is a bit of an algorithm that analyzes the "non human" frequencies and removes those while saving the remainder under whatever format "translation" output you desire (mp3 etc..)
I figured if all the garbage is removed already it would just basically go "well I couldn't really remove anything but uh, here you go"
the only time what you said could apply is if they were going from a lower quality bitrate to a higher quality bitrate.
like 128 converted to 320 would be completely and utterly pointless as the data that represents the difference was already removed.
oh well
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That's true to a certain extent, but a) different algorithms remove different information and b) the second algorithm may perform worse with the reduced information from the first. When you recompress you're losing the removed information set from both algorithms. Some parts might overlap, like a lowpass filter, but there is inevitably some additional loss.
Whether that's a perceptible loss is a different story. I have lots of OGG->AAC recompressed files on my iPod, both versions high bitrates, I can't tell the difference. If your bitrates are high enough it's probably fine. If you're doing a 128k MP3->96k WMA it's gonna sound like crap.
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Last edited by n0nsensical; 01-25-2008 at 02:26 PM..
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