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Topic: Mp3's (Read 2281 times) previous topic - next topic
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Mp3's

One of my mp3 tracks has various mixes on it which last over an hour long. I was wondering because while I listen to the mix the volume will lower itself a bit. Another mp3 that last around the same time gets a bit of static in the song. So I was wondering what I can do to cure or prevent those type of problems. 
Dj Guest

Mp3's

Reply #1 –
Have you checked the files to see if what you're hearing is actually part of the mp3? You could probably open them in Audacity or something similar and take a look.
 

Mp3's

Reply #2 –
Do you mean "prevent" the problems or "fix" the problems?  Preventing these problems shoudn't be too hard.

There probably isn't much you can do about the "static".    There are noise reduction filters (Audacity has noise reduction[/color]), but it usually work best with constant low-level background noise (like a little hum or tape hiss).  And, noise reduction also works best you when you can feed it a sample/reference of the noise-only.  Since the static (apparently) only occurs during the music, you don't have a sample of static-only. 

To fix the volume problems, Audacity has something called Envelope Editing[/u] that allows you to adjust the volume "envelope".   

Be careful when adjusting volume.  The average volume might be low (so it sounds quiet) but you can still have peaks that reach 0dB (the digital maximum).  If you boost the volume, you can get clipping[/color] (distorted flat-top waves).  You can prevent clipping buy normalizing the overall volume after making volume changes (but before saving).

Also, since MP3 is lossy compression, it's considered "bad practice" to edit MP3s (which requres the MP3 to be de-compressed and then re-compressed).    You may not have a choice, and you may not notice any deterioration, but its something to be aware of and you should keep your "original" copy.