I made a simple experiment concerning the way Mp3tag adds lengths of files
I created a WAV file that was 44 Hz stereo 16-bit. And I made difference version of it on account of its lenght. And then multiplied it and loaded to Mp3tag. The results were
A] 1.000 seconds long file x 60 = 60 seconds in Mp3tag
B] 1.001 seconds long file x 60 = 60 seconds in Mp3tag
C] 1.499 seconds long file x 60 = 120 seconds in Mp3tag
D] 1.501 seconds long file x 60 = 120 seconds in Mp3tag
This might seem unimportant: but not when you are working with something like hundreds of 4-6 second files, that stacked together create a playlist. You get then result off by whole minutes. And this is plain wrong and misleading
That little experiment of mine was conducted in Mp3tag 2.95 on Windows 7 x64
Is this calculation correct?
Isn't that extra bit in
just a thousendth of a second? So you would need 1000 files to be 1 second off?!
So I wonder how
I would think that you would need 60,000 files for a deviation of 1 minute.
Listening to 60,000 files with a length of 6 seconds would then lead to 360,000 seconds of listening time or
or 250 days.
I think that after that time the deviation is negligible.
I did some testing in v2.97. It seems that Mp3tag rounds off each file separately down to the nearest second before adding up the total time, which means that the total rounding error will increase with the number of files.
The error could be nearly 1 second for each file, which means that those 60.000 files could have an error of 60.000 seconds (> 16 hours) in theory.
As poster pointed out, those calculations are probably incorrect: 60x1,5=90 but Mp3tag showed 60 seconds when I tested, not 120. Still a rounding error though.
But personally I don't see the big problem. In my library most tracks are several minutes long, so a 1 second rounding error per track (worst case scenario) is negligible.
The problem seem to be very short files where naturally, the percentage of deviation is biggest in respect to the total length.
But do other programs do it better?
I took the value display from MP3tag, Foobar from the list, Foobar raw from the properties sheet and Windows Explorer.
Here a selection
0:02.250 (99 207 samples)
0:04.213 (185 795 samples)
0:02.913 (128 467 samples)
0:02.740 (120 844 samples)
In total the calculation is 116 thousandth of a second off the real value.
It looks as though MP3tag does not always round to the last whole second.
Actually, the MP3tag data matches fairly accurately that of the other 2 programs.
Except ... that the WE shows 1 second less for the last file.
So I am pretty sure that the more files you have, the closer the result will be to the actual time as it will level out on average.
So the statement
is not quite right as apparently other programs do exactly the same thing.
I converted the files in my previous post to compare file formats. For the nearly 3-second files, FLAC and mp3 (cbr & vbr) formats were rounded off upwards but the wav files were rounded off downwards in Mp3tag. In Foobar though, all file formats were rounded off upwards.
A bit interesting, but nothing I would worry about.
My initials findings were correct. On purpose have I took time to create files that have an "excess" or are missing just a 1/1000 of a second
And yes I did double check that back then- and once again just now, repeating the whole process from scratch [with Sony Sound Forge 7.0 creating 44,100 Hz, 16 Bit, Stereo PCM wave file] But now the results were different. Until I hit the 2.000 mark, all I was getting with 60 files was 60 seconds [a second per file, even for a 1.999 long]. So was I wrong back then?
and now I am using Windows 10 Enterprise x64 18362.239. [And it made no difference now if Mp3tag was in version 2.95, 2.96 or 2.97]
As I pointed out
And by you I mean of course me, as this is not some hypothetical scenario that I came up with, but an an actual task that I do 10-20 times a year. Sometimes I work with files that have even as little as ~2 seconds while building a playlist that is suppose to have 4, 5 or even 6 hours- and so I cannot be off more than one minute
Yes, also Winamp has problems with correctly displaying the total length. But that was one of the reasons that I started to use Mp3tag- to have the exact time given to me
And for the longest time I thought it worked as I imagined it would, with super precision. But as my test shown, I was wrong in that assumption
I am sorry but it is your statement that is wrong. This is basic logic [a case for a sentence diagram study, as Wikipedia hints me to translate it like that, that academical / grammatical process of which I am thinking of now]
The fact that a Software B and Software C also is not quite accurate does not turn proved inaccuracy of Software A to become something accurate
And to further state my ground: what if the not so long added ability to tag movie files turned out to by erroneous- in that the file that has 1:00:00 would be shown as having 1:00:04? Who of you would call it insignificant difference? And at what difference you would start calling it it a bug / issue that needed to be taken care off? At 1:00:00 being shown as 1:01:00?
But to be fair, this seems to be coming out from how the operating system reads the files. So could the results [the differene] also be intertwined with the file system used for a given drive?
Be it how it may, but
is something does not fit into my book
I thought that Mp3tag was suppose to be better than other programs- and hardcore users were here to make sure that it becomes with time
And so I do not understand the dismissal of my finding. Yes, they are issues probably more pending and new features to be implemented, but an existing issue is still an issue
Perhaps this is no real issue for other users.
I don't have thousands of files with just a length of one or two seconds.
And to be honest: I have serious problems to tell by just listening if a file was half a second longer or shorter than displayed.
But apparently, requirements depend a lot on the individual case.