![]() Thanks for this very detailed explanation Doug. The 89dB default is a compromise that works with more files If you make it lower, MP3Gain has “more room to work” and fewer files will clip. Again, you are limited to volume adjustment (or normalization) in 1.5dB steps There are special purpose MP3 editors (like MP3DirectCut) that can do some limited editing without decompressing/re-compressing. It’s best to work with a lossless format (if possible) and convert ONCE to MP3. If you re-export as MP3 you are going through another generation of lossy compression and some “damage” does accumulate. When you open an MP3 in Audacity (or any “normal” audio editor) it gets decompressed. MP3 can only be adjusted losslessly in 1.5dB steps and since MP3Gain works losslessly it can only adjust in 1.5dB steps. Or if you have a truly-clipped file you can reduce the volume so the peaks are below 0dB (which of course doesn’t fix the clipped wave shape) and Audacity won’t show it as clipped. It’s just looking for samples over 0dB, or a few 0dB samples in a row. Audacity isn’t looking at the wave shape. Regular WAV files, audio CDs, digital-to-analog converters (playback) and analog-to-digital converters (recording) all all hard-limited to 0dB and they will clip if you try to go over.Īudacity shows potential clipping (red). In that case, the actual audio will only be clipped if you feed it to your digital-to-analog converter at (or near) full-digital volume. MP3 can go over 0dB without clipping so your file might not really be clipped. The 89dB default is a compromise that works with more files. If you make the target loudness higher you are more likely to clip (or find more files that can’t hit the target without clipping). That won’t change when you normalize because the ratio between loudness and peak doesn’t change. If you don’t allow clipping it will only adjust it as much as it can. The other two clip(Track) and clip(Album) are just warning you of clipping if you adjust to the target loudness. But it usually only peaks about 1dB higher. If you normalize to 0dB and export as MP3, the MP3 peaks may go over 0dB and if you re-import the MP3 Audacity may “show red”. ![]() …MP3 is lossy so it does change the wave shape and some peaks often get higher. That shouldn’t show clipping if you’ve normalized to -3 or -6dB. Now audacity claims that they have significantly improved Normalize, but I think that this should be kept in mind before you try to normalize the sound.I have just tried it from the original file to -6dB, and MP3Gain gives the same clipping levels, between 4 and 6dB too highĬlipping tells you if it currently goes over 0dB. But, if your music library is all high quality mp3, I mean 256 and 320 kbit/s, and the sampling frequency is 44.1 and 48 kHz, you probably will not notice a quality loss (drop). Note: Using audacity will affect the quality of your music. One of these features, is Adjust volume with Compressor, Amplify, And more! See the complete list of features.Change the speed or pitch of a recording.Cut, copy, splice or mix sounds together.Edit Ogg Vorbis, MP3, WAV or AIFF sound files.Convert tapes and records into digital recordings or CDs.You can use audacity to normalize the volume of you whole music library.Īudacity is a free, easy-to-use and multilingualĪudio editor and recorder for Windows, Mac OS X, GNU/Linux and other To use it, go into the directory where you store your music files, and then run this command: find -name '*mp3' -exec mp3gain -r -k \ I use a command line utility called mp3gain, which is available in the repositories.
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