![]() MP3Gain writes the following APEv2 tags, which is what allows the tool to reverse the changes: The way MP3Gain works actually has a very strong benefit: since it is the data itself that is modified, MP3Gain does not require special support from players. Likewise, if you subtract 1 from this field, you multiply the amplitude by 2^(-1/4) = 84 % = -1.5 dB.If you add 1 to this field in all the MP3 frames, you effectively multiply the amplitude of the whole file by 2^(1/4) = 119 % = +1.5 dB. ![]() When an MP3 player decodes the sound in the frame, it uses the global gain field to multiply the decoded sound samples by 2^(gain/4). This field holds an 8-bit integer which can represent values from 0 to 255. In each frame there is a "global gain" field. Each frame represents a fraction of a second of sound. The MP3 format stores the sound information in small chunks called "frames". Here's the technical reason on why it's lossless (despite operating on the data itself), and also why the smallest change possible is 1.5 dB: With MP3Gain, the loudness adjustment is done on the data itself, albeit in a lossless/reversible way.Īnother difference with MP3Gain is the fact that it can only adjust physical volume in 1.5 dB steps. However, with most other formats, the necessary loudness adjustment of ReplayGain is stored as metadata, thus leaving the encoded results alone. MP3Gain is an implementation of ReplayGain, supporting Track mode and Album mode. This way, you don't have to keep reaching for the volume dial on your MP3 player every time it switches to a new song. It can then adjust the MP3 files so that they all have the same loudness without any quality loss. My setup is +3db (92dB) for replaygain, and -4dB for non-replaygain formats.MP3Gain is a program that analyzes MP3 files to determine how loud they sound to the human ear. One slider is for those formats with replaygain ( musepack, mp3, vorbis. I would like to end saying that this playback gain setting of foobar works for all the formats. Mp3Gain had reduced it by 1.5dB and Foobar2000 reduces 0.5dB more to get your desired value, which MP3Gain could not get. If foobar2000 had scanned File2.mp3, and MP3Gain had applied a gain of -1.5dB, Foobar2000 would detecte the file to be +96.5dB, and the replaygain would have been -7.5dB. (Actually, your desired value, which MP3Gain could not set) Now foobar does -9dB + 7dB = -2dB to play this file. You set foobar2000 playback gain to 96dBs. Since it can only change with 1.5dB increments, it just applies -1.5dB.įoobar2000 scans the File1.mp3, it detects +98dB, which means -9dB of replaygain. Mp3Gain (tries to) reduce the file by 2 dB. You now scan with Foobar2000 instead and says it has a Replaygain of z dB's.įoobar goes to play this file, reads the replaygain, reads the playback gain ( g dB's) it has in preferences, does z + g and applies this as the gain. Now you have File2.mp3 which is the File1.mp3 but MP3Gained. If y is bigger than x, MP3Gain increases the loudness of the file. You tell MP3Gain your desired *target* y dB's. You then tell MP3Gain to apply a change in the gain to that MP3. MP3Gain Scans it and tells you the loudness it detects for that file. So foobar is telling me it's -9,57 because the slider in Playback Preferences is set to 0,0 (89 dB)? If I set it to 96, it'll change? Isn't that counterproductive, changing the value for those with RG info?ĭoesn't it have to do with the value in Preferences > Advanced > Tools? Then foobar2000 shows that as -9,57 even though the applied gain was -3,0. Let's say I scan a file using MP3Gain, which is set to 96 dB. If you want foobar2000 to play the mp3 at the reference you put in mp3gain, you need to change the setting in preferences-playback, with RG info, and increase the slider to the reference you want.Īnyway, the preffered solution is do the opposite, reduce the slider for the non-replaygained files. Then, the tag tells what would a replaygain-aware player need to use to play at it at the reference dB (the standard one, 89). Quote from: on 21:24:30 What is important is that both do it right, although you may think it differs:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |