Hi Frank, On Fri, May 08, 2009 at 12:14:53PM +0200, Frank Blendinger wrote: > > On Thu 2009-05-07 21:16, Richard van den Berg <rich...@vdberg.org> > proclaimed: > > On 5/7/09 5:06 PM, H. Langos wrote: > >> What's important is the fact that there seems to be a standard that defines > >> how volume adjustment data can be stored in id3 tags. > > > > Nice research. RVA2 is definitely the standard to use, and gnupod > > already has support for it. The problem is that there is not a lot of > > software that writes RVA2 tags. (The only ones I know about are iTunes > > and normalize). mp3gain should really be changed to write RVA2 tags > > instead of APE ones. > > You might want to take a look at this python script: > http://mpd.wikia.com/wiki/Hack:ape2id3.py > > It will read the ReplayGain settings from APE tags and add it to ID3v2 > tags. It has worked without any problems for me so far.
Oh, this is a new one .. it takes the prose that mp3gain and vorbisgain generate and stores it in a prose id3 tag ... > So to sum this up, we could have to deal with: > * APE tags > * RVA2 in ID3v2.4 or XRV/XRVA in ID3v2.3 or RGAD in ID3v2.3 > * iTunNORM as Comment in either ID3v2.3 or v2.4 > > Did I miss anything? You missed the id3v2.3 RVAD tags. The definition in the standard is IMHO a horrible read. Little wonder the apple guys used it in a way that certainly was not intended by the standard's authors... https://savannah.nongnu.org/support/?105294 The intended use stays unclear. But maybe my hifi karma is not good enough to grasp it ;-) > All of those could potential be present at once in a file. There can > only be either an ID3v2.3 or an ID3v.4 as far as I can tell. But there > can always be that iTunNORM comment in addition to the RG tags, and also > additional APE tags. I have actually seen files in the wild that have > all of this present. [1] > > So how will gnupod handle this? I suppose the iPod will just use > iTunNORM and ignore anything else. Will gnupod use a present iTunNORM > comment or will it always create one from ID3v2/APE information? Currently gnupod writes the "soundcheck" attribute it gets from iTunNorm comments as well as the "volume" attribute computed from the RVA2/XRVA tag. The volume attribute however is limited in its scale. it can only go from -100% to +100%. The lower bound is ok as it represents silence, but the upper bound is BS as it only allows gains of 6dB. So I guess we might want to abandon that in favor of manipulating the soundcheck attribute: http://www.id3.org/iTunes_Normalization_settings As I see it now. I am wasting a lot of time on this. I'll think about it but I guess I will not put too much work into it myself. cheers -henrik _______________________________________________ Bug-gnupod mailing list Bug-gnupod@nongnu.org http://lists.nongnu.org/mailman/listinfo/bug-gnupod
