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Topic: "Apply ReplayGain to file content" Question (Read 2378 times) previous topic - next topic
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"Apply ReplayGain to file content" Question

When applied to MP3's, is this process lossy? Or does it work like MP3Gain (though without the ability to undo any changes)?

"Apply ReplayGain to file content" Question

Reply #1 –
The process is irreversible in that "undo data" is not kept and gain deltas are written directly to the frames themselves, but the process is not necessarily lossy.

"Apply ReplayGain to file content" Question

Reply #2 –
Quote from: Zarggg on
The process is irreversible in that "undo data" is not kept and gain deltas are written directly to the frames themselves, but the process is not necessarily lossy.


As far as what I intend to do, all that matters to me is whether or not the result will be of lesser quality (like when you convert an MP3 to another lossy format like OGG).

"Apply ReplayGain to file content" Question

Reply #3 –
The result shouldn't be of lesser quality. It works by adjusting the volume of each existing MP3 frame, not by re-encoding.

This explains the way MP3Gain works. http://en.wikipedia.org/wiki/MP3Gain
I assume foobar2000 works exactly the same way. MP3Gain saves info regarding any volume adjustments it makes to Ape tags in order to make the process reversible. Foobar2000 doesn't save the same info. I think MP3Gain uses Ape tags rather than the standard MP3 tags (both types can co-exist) to make it less likely another program will over-write or remove them.

"Apply ReplayGain to file content" Question

Reply #4 –
Just confirming previous people's statements. It works losslessly like MP3Gain.
 

"Apply ReplayGain to file content" Question

Reply #5 –
This post is late coming, but thanks for the answers everyone.