IPB

Welcome Guest ( Log In | Register )

Help. How to evaluate a Mp3's quality? Like noise existed in the f
MaiTiano
post Apr 16 2012, 12:00
Post #1





Group: Members
Posts: 15
Joined: 17-January 11
From: SZ, China
Member No.: 87372



As mentioned in the title.

Now I am evolving into a project. In this project, we have a 128kbps mp3 library and we need to find which files have the inferior quality, such as noise existed, volume is too small etc.

Any advice? It would be better if someone know some open-source project which already has the ability to detect the mp3 files with bad quality.

many thanks.
Go to the top of the page
+Quote Post
 
Start new topic
Replies
halb27
post Apr 16 2012, 12:10
Post #2





Group: Members
Posts: 2414
Joined: 9-October 05
From: Dormagen, Germany
Member No.: 25015



Sounds like you don't have a reference to the original uncompressed music.
If this is true the only thing that can be achieved IMO is looking for issues like temporal smearing with percussion instruments or impulses for electronic music, or other things like unusual tremolo or other effects. But without reference to the original it's often hard to say whether suspected issues are due to mp3 compression or due to an imperfect recording for instance.


--------------------
lame3100m --bCVBR 300
Go to the top of the page
+Quote Post
MaiTiano
post Apr 17 2012, 02:35
Post #3





Group: Members
Posts: 15
Joined: 17-January 11
From: SZ, China
Member No.: 87372



QUOTE (halb27 @ Apr 16 2012, 12:10) *
Sounds like you don't have a reference to the original uncompressed music.
If this is true the only thing that can be achieved IMO is looking for issues like temporal smearing with percussion instruments or impulses for electronic music, or other things like unusual tremolo or other effects. But without reference to the original it's often hard to say whether suspected issues are due to mp3 compression or due to an imperfect recording for instance.



Yep, I do not have the reference to the original lossless music.

My goal is to tell whether a mp3 file has a good quality or not just depends on its file only. No matter the bad quality is caused by mp3 compression or imperfect recording, I just need to tell people that it has good quality or not.
Go to the top of the page
+Quote Post
saratoga
post Apr 17 2012, 02:53
Post #4





Group: Members
Posts: 4718
Joined: 2-September 02
Member No.: 3264



Determining which will sound better to a person is a subjective process, and no one that can be readily done by a machine.

This post has been edited by db1989: Apr 17 2012, 15:20
Reason for edit: removing unnecessary full quote of above post
Go to the top of the page
+Quote Post
Nessuno
post Apr 17 2012, 07:42
Post #5





Group: Members
Posts: 422
Joined: 16-December 10
From: Palermo
Member No.: 86562



QUOTE (saratoga @ Apr 17 2012, 03:53) *
Determining which will sound better to a person is a subjective process, and no one that can be readily done by a machine.


So what the "quality" setting of every lossy encoder does actually mean?

This post has been edited by Nessuno: Apr 17 2012, 07:44


--------------------
... I live by long distance.
Go to the top of the page
+Quote Post
MaiTiano
post Apr 17 2012, 08:44
Post #6





Group: Members
Posts: 15
Joined: 17-January 11
From: SZ, China
Member No.: 87372



Yes,I do think that there is a evaluation rule for the music quality. not only the bitrates can be used to evaluate it(actually bitrates can not be viewed as the accurate quality rule neither:) )

This post has been edited by db1989: Apr 17 2012, 15:21
Reason for edit: as in post #5
Go to the top of the page
+Quote Post
Nessuno
post Apr 17 2012, 09:11
Post #7





Group: Members
Posts: 422
Joined: 16-December 10
From: Palermo
Member No.: 86562



QUOTE (MaiTiano @ Apr 17 2012, 09:44) *
Yes,I do think that there is a evaluation rule for the music quality. not only the bitrates can be used to evaluate it(actually bitrates can not be viewed as the accurate quality rule neither:) )


Well, if they are VBR and they have been encoded by the same encoder with the same settings and they all contain similar musical "patterns" (e.g. all symphonic, all piano, all chamber) then actual bitrate might be a very rough estimate of content quality.

Of course "quality" sic et simpliciter is really a very vague criterion....


--------------------
... I live by long distance.
Go to the top of the page
+Quote Post

Posts in this topic
- MaiTiano   Help. How to evaluate a Mp3's quality? Like noise existed in the f   Apr 16 2012, 12:00
- - halb27   Sounds like you don't have a reference to the ...   Apr 16 2012, 12:10
|- - MaiTiano   QUOTE (halb27 @ Apr 16 2012, 12:10) Sound...   Apr 17 2012, 02:35
|- - saratoga   Determining which will sound better to a person is...   Apr 17 2012, 02:53
|- - .alexander.   Robot will never replace man © Ogre   Apr 17 2012, 06:36
|- - Nessuno   QUOTE (saratoga @ Apr 17 2012, 03:53) Det...   Apr 17 2012, 07:42
|- - MaiTiano   Yes,I do think that there is a evaluation r...   Apr 17 2012, 08:44
||- - Nessuno   QUOTE (MaiTiano @ Apr 17 2012, 09:44) Yes...   Apr 17 2012, 09:11
||- - MaiTiano   For the simplicity, for the 1st step, at least I w...   Apr 17 2012, 10:01
||- - knutinh   QUOTE (MaiTiano @ Apr 17 2012, 11:01) For...   Apr 18 2012, 11:59
|- - pdq   QUOTE (Nessuno @ Apr 17 2012, 02:42) QUOT...   Apr 17 2012, 13:38
|- - Nessuno   QUOTE (pdq @ Apr 17 2012, 14:38) QUOTE (N...   Apr 17 2012, 17:38
|- - saratoga   QUOTE (Nessuno @ Apr 17 2012, 12:38) And ...   Apr 17 2012, 17:53
- - Nessuno   QUOTE (MaiTiano @ Apr 16 2012, 13:00) Now...   Apr 16 2012, 12:25
- - IgorC   Starting from previous knowledge will be somethin...   Apr 17 2012, 14:28
- - Dynamic   QUOTE (MaiTiano @ Apr 16 2012, 11:00) Any...   Apr 18 2012, 11:51
- - MaiTiano   I would like to add a more specific example to ill...   Apr 18 2012, 12:35
- - Dynamic   You've defined your problem a bit better. You...   Apr 18 2012, 13:22
|- - MaiTiano   QUOTE (Dynamic @ Apr 18 2012, 14:22) You ...   Apr 19 2012, 03:27
|- - saratoga   QUOTE (MaiTiano @ Apr 18 2012, 22:27) I h...   Apr 19 2012, 03:33
|- - MaiTiano   QUOTE (saratoga @ Apr 19 2012, 04:33) Sin...   Apr 19 2012, 03:44
|- - Dynamic   I'd assumed, perhaps wrongly, that you were di...   Apr 19 2012, 20:41
|- - MaiTiano   QUOTE (Dynamic @ Apr 19 2012, 21:41) I...   Apr 20 2012, 04:39
- - Dynamic   [1] - Yes, I think it's the whole song [2] - I...   Apr 25 2012, 20:44
- - MaiTiano   QUOTE (Dynamic @ Apr 25 2012, 21:44) [1] ...   May 22 2012, 02:24


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 21st April 2014 - 13:23