The Traders' Den  

  The Traders' Den > Where we go to learn ..... > Technobabble > Lossy or Lossless?
 

Notices

Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

Reply
 
Thread Tools
  #1  
Old 2008-03-23, 08:38 PM
Mills1988 Mills1988 is offline
88.56 GB/49.60 GB/0.56
 
Join Date: Oct 2007
trader's little helper ?

Is this pretty accurate to test a wav file ? to see if it's an mp3 or not? Seems pretty simple to use- just click on a wave file and press "test". No looking at spectral analysis (which I have no clue about). I've done a few files so far. It never says 100 percent that it's MPEG, but it did say 95 percent that the one file was MPEG. Sorry if this topic was covered before.
Reply With Quote Reply with Nested Quotes
  #2  
Old 2008-03-24, 10:45 AM
procella procella is offline
133.33 GB/130.49 GB/0.98
 
Join Date: Sep 2006
Re: trader's little helper ?

TLH isn't accurate to test for lossyness. It detects some bad ones but it fails in others. If you really want to know there is no way around FA and SA.
Reply With Quote Reply with Nested Quotes
  #3  
Old 2008-03-24, 12:27 PM
Five's Avatar
Five Five is offline
TTD Staff
186.65 GB/588.32 GB/3.15
 
Join Date: Oct 2004
Location: Canada
Re: trader's little helper ?

Quote:
Originally Posted by procella View Post
TLH isn't accurate to test for lossyness. It detects some bad ones but it fails in others. If you really want to know there is no way around FA and SA.
yes
__________________
Checksums Demystified EAC Config MakeTorrent WinAmp Config

Modern social theory casts a highly skeptical eye on any declaration that a group of persons is without conflict, and insists, on the contrary, that conflict is natural to groups, and even more, is essential to them. -Patrick Henry
Reply With Quote Reply with Nested Quotes
  #4  
Old 2008-03-25, 06:50 AM
Mills1988 Mills1988 is offline
88.56 GB/49.60 GB/0.56
 
Join Date: Oct 2007
Re: trader's little helper ?

Ok. Thanks. So it's not accurate to test if it IS MP3, but how about when it says it IS 100 percent lossless? There is a chance it still could be MP3 sourced?
Reply With Quote Reply with Nested Quotes
  #5  
Old 2008-03-25, 10:19 AM
roann's Avatar
roann roann is offline
TTD Staff
943.08 GB/493.47 GB/0.52
 
Join Date: Nov 2004
Location: Planet Earth
Re: trader's little helper ?

Quote:
Originally Posted by Mills1988 View Post
Ok. Thanks. So it's not accurate to test if it IS MP3, but how about when it says it IS 100 percent lossless? There is a chance it still could be MP3 sourced?
Yes, there is. Unfortunately it is *impossible* to give a mathematical expression/formula that allows to determine for sure whether an audio source is lossy or not. This is due to the number of factors (and the links among each other) that the quality of an audio recording is based upon. If you'd know *all* these factors you could say not lossy with 100% accuracy. But you do not know all factors (for example SBD or FM or Pre-FM or TV or AUD, analog or digital recording, mics used, other recording equipment used, acoustics of the venue, tape generation, filtering or equalizing or remastering somewhere in lineage, and so on, and so on). As you can image all this is way too complex to be exactly captured by a formula or procedure. What the formula used finally gives you is a bit like the weather forecast ...

So Trader's Little Helper is a 100% accurate tool *except* when it comes to test a wav file for lossy source. And it's not TLH that's not accurate. TLH just acts as a graphical user interface for a free command-line application named auCDtect.

In my experiences it is reliable when it comes to studio recordings (btw that's what it was developed for), but it often fails on live recordings. Anyway, use TLH only as a part of the puzzle. As said in other posts above, if you really want to know there is no way around frequency and spectral analysis. But sometimes even such techniques don't give you an obvious result. Just read some threads here and you'll see that sometimes even the experts are arguing about how to interpret the results.
Reply With Quote Reply with Nested Quotes
Reply

The Traders' Den > Where we go to learn ..... > Technobabble > Lossy or Lossless?

Similar Threads
Thread Forum Replies Last Post
Trader's Little Helper - roann Technobabble 905 2014-09-22 10:12 AM
Trader's Little Helper Help? - dannyandamie Technobabble 2 2007-08-26 12:44 PM
TRADER'S LITTLE HELPER ERROR... - Tuttle Technobabble 6 2007-01-16 05:46 PM
Trader's Little Helper errors, need help please: - donovana Technobabble 4 2005-12-22 05:08 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forums


All times are GMT -5. The time now is 01:57 PM.


Powered by: vBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©2004 - , TheTradersDen.org - All Rights Reserved - Hosted at QuickPacket
no new posts