id3 v2.4 replaygain

[ddoonie]

I've searched far and wide to find an app for mac that will calculate replay gain values for mp3's, and i have finally found play.  The only problem i have is that it only writes to id3 2.4, and i believe that rockbox only reads 2.3?  After scanning some music, and loading into my ipod, rockbox is able to read the album replaygain field only, leaving the track field empty.  Do you know of anyway around this, or how i can somehow get this to work?  Or even if there are other mac apps that will work with rockboxes replay gain?

Thanks for your time

Darryl

[pixelma]

Rockbox reads my few files that have ID3v2.4 tags files fine which I tagged with mp3tag in Windows. Album, title and so on are all displayed correctly - I never tried replaygain though. If this doesn't work for you I can only imagine that the program you found does not use the standard tag fields. Maybe you can find a program that does a better job on the UsefulTools wiki page.

[ryran]

Yeah. All my mp3s are replaygained & tagged with id3v2.4 by foobar2k. I've never had any problems.

[ddoonie]

I am 99 percent certain it is written in v2.4 (asked the developer similar questions haha).  I believe that it is written in the correct fields, as i can load it in foobar2000 and it will read all fields...  I can scan an mp3 and post it up here, i that would help anyone...  

Thanks for your time!!

Darryl

[Lear]

I am 99 percent certain it is written in v2.4 (asked the developer similar questions haha).  I believe that it is written in the correct fields, as i can load it in foobar2000 and it will read all fields...  I can scan an mp3 and post it up here, i that would help anyone...  

Please do. If it works in Foobar2000, it should work in Rockbox too. A short "dummy" file will do, as long as it has the right tags.

[ddoonie]

I put some mp3's up on the site, i just tested them on my rockbox'd ipod, with same results, track gain info is not there, but album gain info is...

http://srcpro.com/2.html

If you go to that link there are 4 samples.

I opened the same mp3's in foobar, and it reads both album and track gains, i dont get ittttttttttt haha...  

Thank you for your time!

Darryl

[rasher]

I put some mp3's up on the site, i just tested them on my rockbox'd ipod, with same results, track gain info is not there, but album gain info is...

http://srcpro.com/2.html

That first file at least, has both replaygain values (track, album) in TXXX fields (which fb2k prefers) but only one value in an RVA2 frame (which is the standard in id3v2.4, and which I believe Rockbox prefers).

[ddoonie]

How does this differ from how foobar writes the rva2 frame? does foobar write both values into the frame?  Basically what does that Play software need to do differently for rockbox to read this properly?

[Lear]

Foobar doesn't write any RVA2 frame. It only supports the TXXX frames, so any issues with the RVA2 frame won't be seen by it.

Rockbox on the other hand sees both values, but in this case it should've ignored the RVA2 value, on the basis that it was unclear. This did happen in an earlier version, now it just sets the gain to 0 instead...

[ddoonie]

so if foobar doesn't write to rva2 frames, then why does rockbox pick up the replay gain tags that foobar scans, and not what the play program scans?  If i open the files i scanned in play in foobar, it reads the replaygain fine, all info, track album peak etc...  So what is the difference between how these programs are writing the info?  Speaking to the developer of Play, he states that he is writing to v2.4 tags, but only writing one string in the rva2 frame.

Thanks for your help...

sucks that there are no replaygain programs for os x!!

[Lear]

I was a bit unclear; Rockbox does read the Foobar replaygain values, but the track gain value is then - incorrectly - reset to zero, because Rockbox doesn't know what to do with the single RVA2 value (it contains no indication if it is track or album gain).

You could ask the Play developer to write RVA2 tags just like Quod Libet does, as described here: http://www.sacredchao.net/quodlibet/wiki/Specs/ID3

I'll fix Rockbox so that it ignores the "bad" RVA2 value, as intended.

[ddoonie]

Just an update (for future os x people wanting replaygain scans!!), i asked the developer of play, he added the other rva2 frame string, but didnt work...  I don't quite know how to read the rva2 tags on my computer...  Basically, does anyone know the diff between how foobar and play are writing these tags?  And how rockbox is reading them?  It is reading foobar's without problem, but only the album in Play.  

Thank you all or your help!

[Lear]

The reason the recent changes in Play didn't work in Rockbox is that the ID strings (for the RVA2 frames) were set to "replaygain_track_gain" and "replaygain_album_gain", not "album" and "track" (as mentioned in the document I referred to). Also, RVA2 frames supports peak values, but they are not written by Play.

Foobar just writes TXXX frames, whereas Play writes TXXX and RVA2 frame(s). Rockbox supports both, but doesn't handle the Play RVA2 frames right. Because the RVA2 frame(s) comes after the TXXX frames, you get the problem.

[ddoonie]

Lear, thank you for clarifying!  I submitted final requests to the developer of Play, we'll see what happens.  We may finally have a fully functioning replaygain writer for OS X!!! woohoo!!