This will add APE replay gain tags into the mp3 file(s) chosen. This means that we can use mp3gain (a cute, simple command-line app available in pretty much every Linux distro) to add APE tags into our mp3s with: mp3gain Luckily, an mp3 file can have both APE and ID3 tags. However, for mp3 files, the popular APE format for replay gain tags are not supported MPD can only read ID3 tags for replay gain for mp3’s. The Music Player Daemon (aka MPD), my favorite music player, recognizes replay gain tags if present. Replay gain tags in mp3, flac, and ogg files lets the player adjust the volume accordingly to make the song sound not too loud and not too soft. So for now, the method below is still my preferred way of doing things (mp3gain with APE and then ape2id3.py). A good tool to check your tag info (ID3v2, APE, etc.) is with MP3 Diags (if you’re on Arch Linux, get it here). If you care about the existing ID3v2 tags in your mp3 files, do NOT use mp3gain on them with the “-s i” option (the “-s a” option which is the default and only writes to APE tags, does not do any harm if you only care about APE tags). For me, it seems to corrupt the JPEG image data inside the ID3v2 tag for some reason. UPDATE July 17, 2010: WARNING: mp3gain version 1.5.1 (latest stable command line version) seems to corrupt ID3v2 tag information with the “-s i” option (write info into ID3v2 tags instead of default APE tags). Seriously, you need to read like the first 3 or 4 sentences here! Would take you maybe 30 seconds.UPDATE February 1, 2010: This post is now somewhat obsolete, as mp3gain supports writing to ID3v2 tags instead of APE tags. There is a solution to this annoyance: within each audio file, information can be stored about what volume change would be required to play each track or album at a standard loudness, and players can use this "replay gain" information to automatically nudge the volume up or down as required. Because of this, a random play through a music collection can have one leaping for the volume control every other track. Therefore, the loudness of a given album has more to do with the year of issue or the whim of the producer than the intended emotional effect. This is because once this peak amplitude is reached, perceived loudness can be further increased through signal-processing techniques such as dynamic range compression and equalization. Quote Although music is encoded to a digital format with a clearly defined maximum peak amplitude, and although most recordings are normalized to utilize this peak amplitude, not all recordings sound equally loud. Won't then replaygain, if enabled on the audio player, become pointless? I ask because different CD's have different volume levels anyway.Īgain your help would be much appreciated. Replaygain on one album is fine and makes sense but what if for example I have purchased several mp3's all from different albums and I make one compilation album of all these different mp3's. Not that I'm going to still through hundreds of mp3 files going through them but if I wanted to remove it is it possible? From what I've read on sites I think it's possible but specific software is required. I'm starting to think replaygain is better to have than not to have on the audio file but what if i wanted to remove it. 9.80db quiter if and only if replaygain is enabled on the audio player but if it's not, then the audio file or track will play in its original volume. I just want to clarify first of all that replaygain, if enabled on the player be it an ipod, cd player or windows media player on a computer, equalizes the volume of the tracks so you don't keeping adjusting the volume. You seem to know what you are talking about and I'm very grateful your helping me. I'm not over thinking it I'm just trying to establish what it is before I start buying loads of mp3's. A blanket, I do not understand with no detail will not provide further assistance from me. I will be glad to provide some help, though you really have to work through some of this on your own. There is a ton on information on this subject here available through any simple search using the box at the top of the page. You either asked some program to provide them for you, or you acquired music from a source and have no history as to what was done. Some tracks have replaygain tags and some do not. Nothing in your music itself has changed. In your case, there are gain numbers in the tags that a quality player will notice and the player will adjust the sound level. Replaygain looks at your music and tries to help so you no longer are grabbing at the volume level. You are listening to music and turn the volume up and then down over and over. All tracks and/or albums across all music and all time are at differing sound levels.
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