[flac-dev] Predicting the loss of data from flacs to mp3

[Ivailo Karamanolev]

Hi,

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 ( http://en.wikipedia.org/wiki/Transient_(acoustics) ) are
the most difficult to encode with mp3.

Regards,
Ivailo Karamanolev

On Tue, Mar 20, 2012 at 1:27 PM, Ajay Mandlekar <ajay.mandlekar at gmail.com>wrote:

> Hello,
>
> My partner and I are both high school students who are working on a
> device that encrypts secret messages into sound files. The method that
> we are using involves the conversion of data into an mp3 format, and
> this results in a loss of data that is crucial to the success of the
> device. We would like to be able to predict which points are going to
> be modified significantly or lost completely when we write our data as
> an mp3. Could you help us?
>
> We were able to achieve success with .flac files (since they're a
> lossless audio format), but with mp3 files, were unable to recover the
> secret message since the mp3 compression altered the data points. We
> were thinking that if we could know which points (in the time domain)
> would be adversely affected, we could avoid encrypting in those points. Any
> clarification on how .mp3 files compress data would be very helpful.
> Thank you!
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> flac-dev at xiph.org
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