[slim] Re: replaygain = mp3gain??
jth Wrote:
Actually the default behavior of mp3gain as I mentioned should
do exactly what you want. It will calculate and add tages for
both track and album gain. You can verify this by using a command
like strings mysong.mp3 | tail -20 to peek at the ape tags
added to the end of the mp3 file.
Cool! I've gone and done my whole 9000 song library using the
following script. Thank you very much for your help!:
Code:
#!/usr/bin/perl
#
$FindCmd = find /data/music/mp3/ -mindepth 1 -type d -print;
$i = 0;
open( FINDCMD, $FindCmd | ) or die Can't execute $FindCmd: $!\n;
while( FINDCMD )
{
chomp( $line = $_ );
# Take care of escaping special characters in file name
$line =~ s/\(/\\\(/g;
$line =~ s/\)/\\\)/g;
$line =~ s/\!/\\\!/g;
$line =~ s/\?/\\\?/g;
$line =~ s/ /\\ /g;
$line =~ s/\[/\\\[/g;
$line =~ s/\]/\\\]/g;
$line =~ s/'/\\'/g;
$line =~ s//\\/g;
$line =~ s/\/\\\/g;
print DEBUG: $i: $line\n;
$Mp3GainCmd = mp3gain -k ${line}/*.mp3;
open( MP3GAINCMD, $Mp3GainCmd | ) or die Can't execute $Mp3GainCmd: $!\n;
while( MP3GAINCMD )
{
print $_;
}
close( MP3GAINCMD );
print \n\n;
$i++;
}
close( FINDCMD );
--
kyleki
kyleki's Profile: http://forums.slimdevices.com/member.php?userid=2510
View this thread: http://forums.slimdevices.com/showthread.php?t=17193
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[slim] Re: replaygain = mp3gain??
This thread has been dormant for a little while now, so I hope there's still someone listening. After reading through it I now understand what mp3gain does to mp3 files, and what ReplayGain is. But what software can I use to apply ReplayGain tags without changing the volume at every frame? I'm not interested in mp3gain because: 1) I don't want to choose between Track Album normalization. 2) I like the ability to play the files back 'as-is' by simply turning off ReplayGain on my Squeezebox. My only problem is figuring out how to apply the normalization via just the ReplayGain tag in the file header. I see a lot of references to Foobar2000, but I'm running Linux and I'm not a big fan of Wine. Any good Linux programs out there that can handle this (simple) task? Thanks, Kyle -- kyleki kyleki's Profile: http://forums.slimdevices.com/member.php?userid=2510 View this thread: http://forums.slimdevices.com/showthread.php?t=17193 ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
Re: [slim] Re: replaygain = mp3gain??
On 28/11/05, kyleki [EMAIL PROTECTED] wrote: 1) I don't want to choose between Track Album normalization. 2) I like the ability to play the files back 'as-is' by simply turning off ReplayGain on my Squeezebox. MP3Gain should do what you want.. If you use the MP3GainGUI app in windows, and use the 'Album Analysis' button rather than 'Track Gain', it analyses the files and just writes the replaygain tag info into the files without touching the audio streams. It'll write both track and album gain values to the files. You can then choose to use them or not in SlimServer.. HTH, -- - Dr Lovegrove http://www.rusticrhino.com/drlovegrove ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
Hi Dr. Lovegrove, Dr Lovegrove Wrote: MP3Gain should do what you want.. If you use the MP3GainGUI app in windows, and use the 'Album Analysis' button rather than 'Track Gain', it analyses the files and just writes the replaygain tag info into the files without touching the audio streams. It'll write both track and album gain values to the files. You can then choose to use them or not in SlimServer.. Thank you very much for your reply. As I mentioned in my post, I'm not using Windows; I'm using Linux. Do you know if the '-a' parameter to the mp3gain command-line does what you're talking about? My understanding is that you can only choose one of Track Gain or Album Gain, but not both when using mp3gain. Is this not true? I'm so confused... Thanks, Kyle -- kyleki kyleki's Profile: http://forums.slimdevices.com/member.php?userid=2510 View this thread: http://forums.slimdevices.com/showthread.php?t=17193 ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
If you run the command-line version of mp3gain without any switches (mp3gain album-track-01.mp3 album-track-02.mp3 ...) it should add the tags but not adjust the gain itself. You'll need to run it once for every album you have. That shouldn't be difficult to script if you have one album per directory. Of course, test it out before running it against your entire collection. -- jth jth's Profile: http://forums.slimdevices.com/member.php?userid=48 View this thread: http://forums.slimdevices.com/showthread.php?t=17193 ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
jth Wrote: If you run the command-line version of mp3gain without any switches (mp3gain album-track-01.mp3 album-track-02.mp3 ...) it should add the tags but not adjust the gain itself. You'll need to run it once for every album you have. That shouldn't be difficult to script if you have one album per directory. Of course, test it out before running it against your entire collection. Thank you very much! I'll copy a couple of my albums into a separate directory and start playing with this command then. Do you know if it's possible to have both Track and Album gain tags in a single file? For example, sometimes I like to randomly listen to my music and other times I like to listen to single albums. Depending on how I'm listening to my music that day, I'd like the Smart gain feature of the Slimserver to use the right tag, assuming they're both assigned. Is this possible? -- kyleki kyleki's Profile: http://forums.slimdevices.com/member.php?userid=2510 View this thread: http://forums.slimdevices.com/showthread.php?t=17193 ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
Do you know if it's possible to have both Track and Album gain tags in a single file? Actually the default behavior of mp3gain as I mentioned should do exactly what you want. It will calculate and add tages for both track and album gain. You can verify this by using a command like strings mysong.mp3 | tail -20 to peek at the ape tags added to the end of the mp3 file. -- jth jth's Profile: http://forums.slimdevices.com/member.php?userid=48 View this thread: http://forums.slimdevices.com/showthread.php?t=17193 ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
RE: [slim] Re: replaygain = mp3gain??
I didn't see a response to this, but there have been a lot of slim mails in the last few days :) Anyway, i used exactly the same tools (foo mp3 tag) and get exacly the same behaviour - all zeros in the volume adgustments fields in the web interface. This is for MP3 files at least. All my flacs (tagged using the same tools), show replay gain OK. Any resolution that I have missed ... or do I file a bug? Thx. H. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of GoCubs Sent: 20 October 2005 18:55 To: discuss@lists.slimdevices.com Subject: [slim] Re: replaygain = mp3gain?? OK. Now I'm confused. I had Foobar2000 go through all my MP3's and add replaygain tags. The gain information is visible via Foobar2000 and MP3tag 2.33a (so it's there). However, when I look at what SlimServer is reading for the tag information (via web interface), it's all zero's. What gives? I'm running the latest beta of 6.2 and I've done some complete DB rescans. In listening it didn't seem like replay gain was making any difference, and as it turns out, looks like SlimServer isn't picking up the data. Any ideas? -Greg -- GoCubs ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
Howard Darwen Wrote: Anyway, i used exactly the same tools (foo mp3 tag) and get exacly the same behaviour - all zeros in the volume adgustments fields in the web interface. This is for MP3 files at least. All my flacs (tagged using the same tools), show replay gain OK. Any resolution that I have missed ... or do I file a bug? This thread also seemed to touch on the problem: http://forums.slimdevices.com/showthread.php?t=17342page=1pp=10 But likewise, no solution or confirmation of a bug has been said. -Greg -- GoCubs ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
RE: [slim] Re: replaygain = mp3gain??
OK ... so i submitted one ... http://bugs.slimdevices.com/show_bug.cgi?id=2381 Thx. h. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of GoCubs Sent: 26 October 2005 19:10 To: discuss@lists.slimdevices.com Subject: [slim] Re: replaygain = mp3gain?? Howard Darwen Wrote: Anyway, i used exactly the same tools (foo mp3 tag) and get exacly the same behaviour - all zeros in the volume adgustments fields in the web interface. This is for MP3 files at least. All my flacs (tagged using the same tools), show replay gain OK. Any resolution that I have missed ... or do I file a bug? This thread also seemed to touch on the problem: http://forums.slimdevices.com/showthread.php?t=17342page=1pp=10 But likewise, no solution or confirmation of a bug has been said. -Greg -- GoCubs ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
I don't think anyone has yet actually described the technical difference between MP3Gain and ReplayGain, so I'll try and give the details... As I'm sure you all know, an MP3 file is a sequence of frames. As well as the audio data, each frame also contains a header, and one attribute in the header tells the replay device at what level to output the frame. MP3Gain updates this attribute in the header of every frame in the file, in order to adjust the playback level up or down. Note that the actual audio is not updated, just the instruction as to what level it should be. Therefore it's a lossless adjustment. Recent versions of MP3Gain also add a comment in the file's metadata to indicate by what amount it has adjusted the level, so that it can be undone. In contrast, ReplayGain does not alter the headers in the individual frames, but simply writes some tags in the file's metadata to indicate what amount of playback level adjustment should be made. As it happens, the same algorithm is used by ReplayGain and MP3Gain to calculate what the appropriate level change should be. The advantage of MP3Gain is that since the actual frame headers are changed, the loudness equalisation effect works on ALL replay devices. The disadvantage is that only one level change can be applied (ie. you can ask for track gain, or album gain, but not both). On the other hand, ReplayGain can add multiple tags, to allow for different level changes for different playback scenarios (ie. it can add tags for both track gain and album gain). But the disadvantage is that the replay device needs to understand the ReplayGain tags in order to apply the level change. If you MP3Gain *and* ReplayGain a file, and then play it back through a device that understands ReplayGain tags, then the playback level adjustment will be applied twice. -- cliveb ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
Re: [slim] Re: replaygain = mp3gain??
cliveb wrote: I don't think anyone has yet actually described the technical difference between MP3Gain and ReplayGain, so I'll try and give the details... As I'm sure you all know, an MP3 file is a sequence of frames. As well as the audio data, each frame also contains a header, and one attribute in the header tells the replay device at what level to output the frame. MP3Gain updates this attribute in the header of every frame in the file, in order to adjust the playback level up or down. Note that the actual audio is not updated, just the instruction as to what level it should be. Therefore it's a lossless adjustment. Recent versions of MP3Gain also add a comment in the file's metadata to indicate by what amount it has adjusted the level, so that it can be undone. Note that there is a subtle edge case where the MP3gain method is not, in fact, lossless: if the frame was originally recorded with an extreme gain value (either very close to to 0 or very close to 255), and the calculated adjustment for the song would push the value outside the 0:255 range, then mp3gain will clip the value to 0 or 255, and is thus lossy. The mp3gain app will warn in this case. Practically speaking, this never happens -- at least with mp3s created with LAME, the original gain on the frame is well away from the extremes. For more info, see `mp3gain -? wrap` . The (huge) benefit of the mp3gain method is that you don't need a player that understands non-standard tags to play back at the right level -- the frame gain value that mp3gain adjusts is part of the original mp3 spec, and any mp3 player (software or hardware) will respect it. - Marc ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
It is probably a better idea to call the process implemented by mp3gain 'reversible' rather than 'lossless' to avoid confusion. -- jth ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
oreillymj Wrote: Peter, If you look at the song info in the Web UI of Slimserver you see the volume adjustement info stored in the file. e.g. Title:One More Robot/Sympathy 3000-21 Artist: Flaming Lips Album:Yoshimi Battles The Pink Robots Genre:Rock Track:2 File Format: MP3 Duration: 4:59 Year: 2002 Volume Adjustment:0.40 dB .. this song needs a boost of .40Db whereas ... Title:Big Snake Artist: Lloyd Cole The Commotions Album:Mainstream Genre:Unknown Track:8 File Format: MP3 Duration: 5:16 Year: 1987 Volume Adjustment:-0.02 dB OK. Now I'm confused. I had Foobar2000 go through all my MP3's and add replaygain tags. The gain information is visible via Foobar2000 and MP3tag 2.33a (so it's there). However, when I look at what SlimServer is reading for the tag information (via web interface), it's all zero's. What gives? I'm running the latest beta of 6.2 and I've done some complete DB rescans. In listening it didn't seem like replay gain was making any difference, and as it turns out, looks like SlimServer isn't picking up the data. Any ideas? -Greg -- GoCubs ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
Thanks all for your exhaustive answers! This thread was very clarifying to me. I doubt that I would have found out myself that it's better to disable replayGain if already using Mp3Gain. Bye Peter -- SlimPvC ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
Peter,
ReplayGain is a method of normalising ('levelling') the percieved
volume across files in a collection of MP3's/Flac files etc without
actually changing the music data itself.
The normalisation is done by analysing the file and writing a volume
adjustement level into the comment tags of the files. the files will
then all play at the same volume when re-played by a device that reads,
understands the tags and applies the volume change so all files play
back at the same volume.
MP3Gain is an app that does the file analysis and writes the comment to
the MP3 file. It usually normalises everything to 89Db.
If you look at the song info in the Web UI of Slimserver you see the
volume adjustement info stored in the file. e.g.
Title: One More Robot/Sympathy 3000-21
Artist: Flaming Lips
Album: Yoshimi Battles The Pink Robots
Genre: Rock
Track: 2
File Format:MP3
Duration: 4:59
Year: 2002
Volume Adjustment: 0.40 dB
.. this song needs a boost of .40Db whereas ...
Title: Big Snake
Artist: Lloyd Cole The Commotions
Album: Mainstream
Genre: Unknown
Track: 8
File Format:MP3
Duration: 5:16
Year: 1987
Volume Adjustment: -0.02 dB
.. this song needs the volume lowered.
The actual song data wasn't altered by MP3Gain, but the Squeezebox is
performing the normalisation on-the-fly during playback.
Mick
--
oreillymj
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[slim] Re: replaygain = mp3gain??
mp3gain can also apply the gain directly to the files so that the playback device does not have to understand the replaygain standard. If you've chosen this method you probably would want to turn off replaygain for mp3 files in slimserver so you don't get the volume adjustment performed twice. -- jth ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
[slim] Re: replaygain = mp3gain??
oh yeah, I forgot about that. You can have MP3gain apply normalisation to the file and this does alter/degrade each file as it decodes, normalises re-encodes each file MP3Gain still writes the gain values into the comments fields, as an Undo option, but I don't recommend altering the files this way. I'm not sure if Mp3Gain writes the comments with the same name in this case, but if it does, then any device which understands the tag would apply a volume adjustment to an already normalised file making things worse. -- oreillymj ___ Discuss mailing list Discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
