Hi,<div><br></div><div>Predicting loss of data when encoding mp3 is more suitable for an mp3 discussion forum instead of a lossless format one. A pointer - it isn't possible. It heavily depends on the encoder, compression quality and specific settings. No one will be able to give you a definite answer, as the psychoacoustic model is a complex thing. The best thing you can do is encode the data in mp3 and then compare it. If you really need to predict it - transients ( <a href="http://en.wikipedia.org/wiki/Transient_(acoustics)">http://en.wikipedia.org/wiki/Transient_(acoustics)</a> ) are the most difficult to encode with mp3.</div>
<div><br></div><div>Regards,</div><div>Ivailo Karamanolev<br><br><div class="gmail_quote">On Tue, Mar 20, 2012 at 1:27 PM, Ajay Mandlekar <span dir="ltr"><<a href="mailto:ajay.mandlekar@gmail.com" target="_blank">ajay.mandlekar@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
My partner and I are both high school students who are working on a<br>
device that encrypts secret messages into sound files. The method that<br>
we are using involves the conversion of data into an mp3 format, and<br>
this results in a loss of data that is crucial to the success of the<br>
device. We would like to be able to predict which points are going to<br>
be modified significantly or lost completely when we write our data as<br>
an mp3. Could you help us?<br>
<br>
We were able to achieve success with .flac files (since they're a<br>
lossless audio format), but with mp3 files, were unable to recover the<br>
secret message since the mp3 compression altered the data points. We<br>
were thinking that if we could know which points (in the time domain)<br>
would be adversely affected, we could avoid encrypting in those points. Any<br>
clarification on how .mp3 files compress data would be very helpful.<br>
Thank you!<br>
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</blockquote></div><br></div>