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Originally Posted by Hujra
Howdy all!
Did a bit of a search for volume levellers, and they are around, just not together. I would like to write a FAQ for as many sound formats as possible, whether or not they are compatible for our players (eg. Rockbox will increase codec support, so for future benefits.)
The easy ones are Mp3Gain, Vorbisgain (which ONLY adds adjustment tags - not adjusts volume) Wavegain (didn't have a good look at this though).
Anyone who would like to contribute their findings, etc. will be credited in the final FAQ.
Long live MR
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Alright I'll help
All of these volume-adjusters are ReplayGain algorithm based.
MP3Gain: scans and actually adjusts the global gain field of the mp3's headers. The result is a permanent but reversible volume change that is read by all players that play mp3. Only accurate to every 1.5dB however.
AACGain: scans and actually adjusts the global gain field of the AAC file's headers. The result is a permanent but reversible volume change that is read by all players that play AAC. Only accurate to every 1.5dB however.
VorbisGain: scans and adds values to the file as Vorbis comments. Only read by players that understand ReplayGain tags.
foobar2000: able to add replaygain tags to any file format, even if the file doesn't support it natively; however, in that case usually only foobar2000 can read the adjustments. Only does tag values and not MP3Gain/AACGain style adjustments.
foobar2000 adds the tags in this way for different file formats
mp1, mp2, and mp3: ID3v2 or APEv2 tags
Ogg Vorbis: Vorbis Comments
Musepack: File header
AAC: APEv2 tags
AAC in MP4 container: MP4 tags
FLAC: Vorbis Comments (alternatively called FLAC tags)
WavPack: APEv2 tags
Monkey's Audio: APEv2 tags
Rockbox can read ReplayGain tags on most of the filetypes it can read, however for mp3 it can only read ID3v2 tags.
Hope this helps
