Support and General Use > Theming and Appearance Customization

Replay Gain Fuze V1

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audio-i:

--- Quote from: gevaerts on September 29, 2010, 10:24:25 AM ---Some replaygain tools like writing APE tags to mp3 files

--- End quote ---

That's exactly the case with mp3gain. I used to use a tool (MP3tag, but there must be others) to read the APE tags and then write them to ID3v2. Now I just use foobar for everything (including replaygain) which writes ID3v2 tags directly.

Avalon:
Thks, I will give foobar a try.

jimbilly:
I'd be interested to see what the tag values are.

I was just reading about the mp3gain program,  i don't think it is designed to work with 'replay gain' enabled players, seems like it just modifies the gain within the mp3 file somehow so that it works regardless of the player.   I think the tags it writes are just for undo purposes (if you want to get the original volume back).   I think if you use mp3gain to scan all of your files, you do not need to use the rockbox replay gain function. (since the files have already been modified)

A better method (if you want to preserve the original levels in the mp3 files) would be to replaygain scan the files with foobar or winamp and have the replay gain tag fields populated properly(and the original volume left alone) then the player can adjust the gain on the fly with the replay gain feature.  This gives you more flexibility if you wanted to have the ability to turn it on or off or modify settings without rescanning your library.   I think if you replaygain scan your files(with foobar2000 or winamp) now that they've already been modified by mp3gain, you'll find that the levels will all be similar since the files have already been modified.

so probably, leave them alone and turn off replay gain on rockbox,  or  remove mp3gain somehow from all the mp3 files and rescan with another method and then turn on replay gain in rockbox.

I based my assumptions on this info, see the TAGS section:
http://mp3gain.sourceforge.net/faq.php

Avalon:
I agree.  I tried foobar2000 and it does display the same replaygain tag information as mp3gain has written it.

I was hoping that RockBox would display the replaygain (%rg) info even though it is not applying it to the file.  It is stored in the tags and if not displayed for files that have been modified, the %rg function is misleading, at least when using mp3gain.

I can remove the mp3tag changes and redo the tags using foobar2000, but that will take quite a lot of time.

Llorean:
It's a problem with mp3gain not actually doing replaygain tags, but instead doing its own things (or, when it does do tags, doing them in ApeV2 tags, rather than standard ID3 tags). Basically, the tool you've chosen really isn't the best one to have been using in the first place.

%rg isn't being misleading at all - it tells you if a Rockbox readable replaygain tag is there. If it says there's not one, it's because Rockbox can't read one.

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