Loud the file actually sounds to a human's ears. Instead, MP3Gain uses David Robinson's Replay Gain algorithm to calculate how Yes, but MP3Gain does not use "peak amplitude" normalization as many "normalizers" do.Īudio files with very different peak amplitudes can still sound to the human ear as though they're the same volume. In the case of Flac, Ogg, and most (all?) other formats that support ReplayGain, Metadata tags are written, which is a lossless process (the actual audio data is not changed in any way).MP3Gain automatically adjusts mp3s so that they all have the same volume In the case of WAV files, ReplayGain tags are not supported and WAV files do not have a “gain” setting, so the only way to apply a ReplayGain loudness is for the scanner to amplify the audio data - this process is not lossless - if the loudness is set too high then the WAV file is permanently damaged. If Metadata tags have been used, then the original audio data will be read correctly (because it has not been altered by ReplayGain). The disadvantage of the latter method is that it “could” cause some peaks to exceed 0 dB and be clipped. The latter has the benefit that the ReplayGain setting will work even in players that do not support ReplayGain. When metadata tags are used, the audio data is not changed at all, so players (or editors) that do not support ReplayGain Tags will play the track at the original level (ignoring the ReplayGain analysis). In the case of MP3 files, depending on how ReplayGain is implemented by the ReplayGain scanner application, and/or what settings have been chosen, the playback level may either be written to metadata tags, or may be written as a “gain” parameter in the MP3 data. “ReplayGain Tags” are metadata tags (similar to id3 tags) that store the results of the ReplayGain analysis. “ReplayGain” is an algorithm for measuring “loudness”. What Sound Forge does or doesn’t do has nothing to do with Audacity. I don’t use Sound Forge, but if Sound Forge is damaging your files, then you could take that up with Sony. If the ReplayGain in MP3 file is not lowered then after such pumped MP3 is loaded into Sound Forge, the audio is permanently destroyed. I’m using old Sony Sound Forge 7.0 for editing. So I have three question:ġ] Does ReplayGaining feature on FLACs works the same way? I mean: if a FLAC file is pumped up, do I have to lower it down before encoding to WAV ? Or maybe that r-gain info is somehow stored differently in them and so audio in WAV won’t show up raised as it is in FLAC ?Ģ] Does ReplayGaining on WavPacks works the same way? Do all files are treated the same way with this process?ģ] What software could I use to check / change replay gain on FLACs ? All I found was foobar2000, but it doesn’t seem to work neither for FLACs and MP3’s Ĥ] Why do all FLACs that I download from the Internet look like they have been put through the process of normalization? In the waveform they look like they should sound bad- but they don’t Unfortunately MP3Gain does not works with FLACs. ![]() In a matter of fact, I do this every time for new MP3 files [because I always do some editing on new files, so it’s more efficient for me to do unnecessary RG operation that to go back later on for those that do really need it But I use it for the opposite: if I have to edit and MP3 file, which happens to be pumped up, I can lower it down. With it I can pump up the volume in MP3 file and reverse that process without quality loss. I would like to know, how does ReplayGain works on FLAC file format?
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