Why do MP3's take longer to encode than M4A's?

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Dcislander
Posts: 30
Joined: Fri May 04, 2007 1:35 pm

Why do MP3's take longer to encode than M4A's?

Post by Dcislander » Tue Jun 10, 2008 5:53 am

I am currently ripping CDs as both MP3s and M4As. As expected, the Apple Lossless files are much bigger than the MP3 files. What I am curious about though is that once a track is done ripping and the encoder window comes up, the M4As encode much faster than the MP3s. I would have thought it would be the other way around. This is just out of curiosity, but does anyone know why?

Many thanks.

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krmathis
Posts: 233
Joined: Thu Feb 02, 2006 11:05 am
Location: Oslo, Norway

Re: Why do MP3's take longer to encode than M4A's?

Post by krmathis » Tue Jun 10, 2008 9:26 pm

Because its a much more complex algorithm. Since the MP3 encoder have to analyze the audio stream to find out which parts to "drop out". After all its a lossy codec.

Dcislander
Posts: 30
Joined: Fri May 04, 2007 1:35 pm

Re: Why do MP3's take longer to encode than M4A's?

Post by Dcislander » Tue Jun 10, 2008 9:28 pm

Ah. 10-4. Makes sense. Thanks.

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