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Re: [Phys-l] Another technical question



P.S. Here is the link for Audacity, suggested by Bob, in case someone is also interested.

http://audacity.sourceforge.net/help/documentation

Ludwik
====================================


On May 5, 2011, at 7:24 AM, ludwik kowalski wrote:

Thank you John D. and Bob L. I will try to follow your suggestions.

Ludwik
===========================


On May 5, 2011, at 4:38 AM, John Denker wrote:

On 05/04/2011 06:15 PM, ludwik kowalski wrote:
I want to concatenate several short mp3 files (turn them into one
long mp3 file). How can this be done?

Don't do it.

1) mp3 uses a lot of context, which means that any concatenation
involves decoding mp3 into raw audio, concatenating, and then
re-encoding.

Some programs may do this behind your back so you don't notice,
but it is nevertheless being done.

2) mp3 encoding is lossy.

3) Since you have the original raw audio lying around, you are
better off concatenating that, and then encoding.


Since audio files are so small compared to the capabilities of
modern computers, there's no reason to edit anything other than
the original raw audio, upstream of any lossy encoding.

Compression makes sense as the last step before mass distribution.
It does not make sense at any earlier step.

For video the strategy is trickier, but for audio it is a
no-brainer.
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
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Ludwik

http://csam.montclair.edu/~kowalski/life/intro.html




_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

Ludwik

http://csam.montclair.edu/~kowalski/life/intro.html