mp3 File Size

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mp3 File Size #189174 03/18/08 12:13 03/18/08 12:13
Joined: Apr 2005 Posts: 952 Cologne padrino OP User
padrino OP User Joined: Apr 2005 Posts: 952 Cologne	Hello, does anyone here know whether there is a certain formula, with which one could calculate an estimated file size of an mp3 File? (given would be the length and the bitrate of the file...) Weblog (german) Flickr Space

Re: mp3 File Size [Re: padrino] #189175 03/18/08 12:34 03/18/08 12:34
Joined: Jul 2004 Posts: 4,206 Innsbruck, Austria sPlKe Expert
sPlKe Expert Joined: Jul 2004 Posts: 4,206 Innsbruck, Austria	depends on the compression rate. with 128kbps its usually 1:10 to a wave (+- 2mb) the higher the compression rate (192kbps is what i use) the higher the filesize IceValk Entertainment Website My online portfolio

Re: mp3 File Size [Re: sPlKe] #189176 03/18/08 12:50 03/18/08 12:50
Joined: Jul 2002 Posts: 4,436 Germany, Luebeck Xarthor Expert
Xarthor Expert Joined: Jul 2002 Posts: 4,436 Germany, Luebeck	Not sure but for me the mp3 files are 1mb per minute (playtime) with a bitrate of 128kbps. If you only take the bitrate 128 kilo-bit-per-second, divide it by 8 (to get kilo-byte-per-second) and multiply it with 60 (one minute) you get 960 kilo-byte. So I guess 1mb (1024KB) for 1 minute is a good estimation. Correct me if I'm wrong. Last edited by Xarthor; 03/18/08 12:51.

Re: mp3 File Size [Re: Xarthor] #189177 03/18/08 20:00 03/18/08 20:00
Joined: Apr 2005 Posts: 952 Cologne padrino OP User
padrino OP User Joined: Apr 2005 Posts: 952 Cologne	Quote: Not sure but for me the mp3 files are 1mb per minute (playtime) with a bitrate of 128kbps. If you only take the bitrate 128 kilo-bit-per-second, divide it by 8 (to get kilo-byte-per-second) and multiply it with 60 (one minute) you get 960 kilo-byte. So I guess 1mb (1024KB) for 1 minute is a good estimation. Correct me if I'm wrong. I do not know, I may have gotten this wrong, but the bitrate is not constant within a single track. At least that is what I read on wikipedia... Weblog (german) Flickr Space

Re: mp3 File Size [Re: padrino] #189178 03/19/08 15:54 03/19/08 15:54
Joined: Jan 2003 Posts: 4,615 Cambridge Joey Expert
Joey Expert Joined: Jan 2003 Posts: 4,615 Cambridge	for vbr, that's true. not for cbr.

Re: mp3 File Size [Re: Joey] #189179 03/19/08 16:21 03/19/08 16:21
Joined: Apr 2005 Posts: 952 Cologne padrino OP User
padrino OP User Joined: Apr 2005 Posts: 952 Cologne	Quote: for vbr, that's true. not for cbr. alright, now you got me all confused xDD Weblog (german) Flickr Space

Re: mp3 File Size [Re: padrino] #189180 03/19/08 16:30 03/19/08 16:30
Joined: Jan 2003 Posts: 4,615 Cambridge Joey Expert
Joey Expert Joined: Jan 2003 Posts: 4,615 Cambridge	vbr = variable bitrate, cbr = constant bitrate these terms define how the bitrate varies over the compressed binary. mp3 supports both methods and additionally abr (average bitrate) which means that the bitrate varies over e.g. the song but the average is at a specific level.

Re: mp3 File Size [Re: Joey] #189181 03/19/08 17:26 03/19/08 17:26
Joined: Apr 2005 Posts: 952 Cologne padrino OP User
padrino OP User Joined: Apr 2005 Posts: 952 Cologne	is there a version that is more often used than the other one? or are they both common? Weblog (german) Flickr Space

Re: mp3 File Size [Re: padrino] #199861 04/01/08 15:19 04/01/08 15:19
Joined: Jan 2003 Posts: 4,615 Cambridge Joey Expert
Joey Expert Joined: Jan 2003 Posts: 4,615 Cambridge	they're both common. vbr gives you better quality. some very old mp3-players can't play vbr encoded files, but you don't need to care about them anymore nowadays.