hendrik on 29 Aug, 2019 06:05 AM
have tags showing one bitrate, but that have actually been encoded at a lower bit rate.
Typically the bit rate is not encoded in tags, but in the mp3 frame. Is it that what you meant? How can you tell that the "tags" are wrong?
Also, there is of course variable bit rate (VBR), which means there isn't really one bitrate.
I’ve played some 320kbps .mp3s on great speakers and found they sounded really bad.
So, I ran a spectrum analysis on that .mp3, and the results showed that it was actually 96kbps. A-ha! I knew it...!
So this 96kbps file had been converted to 320kbps, but, obviously, retained the sound quality of the original 96kbps file.
So, short of spectrum analysing my whole library one at a time, I looked into batch verifying the bitrate. There is a piece of software which does this called “Fakin’ The Funk”, and I wondered if, seeing as BeaTunes can batch analyse tempo and key, it could also very the actual bitrate of the file (original encoding) against the displayed bitrate, to identify those files that had been re-encoded/converted to give the illusion of a hi-quality .mp3...