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Compression Help Please.
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Banned
Join Date: May 2001
Location: State College,PA,United States
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I made some songs with my friend and I edited them in iMovie, then exported them to full quality quicktime videos and then exported those videos as AIFF's. Each 3 minute song is nearly 35 MB's!!!
What am I doing wrong? Please help me smart people.
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Addicted to MacNN
Join Date: Jul 2001
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If I remember correctly, an AIFF file will be around 10MB per minute, so I'm not sure you did anything wrong.
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Banned
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So, how is it that an MP3 of similar length is about 3 or 4 MB's??? I am in quandry here. Please help.
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Administrator  Join Date: Mar 2000
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multimedia type question.
<img src="http://forums.macnn.com/images/mod_threadmoved.gif" alt=" - " />
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Addicted to MacNN
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</font><blockquote><font size="1" face="Geneva, Verdana, Arial, sans-serif">quote:</font><hr /><font size="1" face="Geneva, Verdana, Arial, sans-serif">Originally posted by Macintosh:
<strong>So, how is it that an MP3 of similar length is about 3 or 4 MB's??? I am in quandry here. Please help.</strong></font><hr /></blockquote><font size="1" face="Geneva, Verdana, Arial, sans-serif">MP3 is a compressed format, which is why the quality isn't as good as AIFF. I've burned many audio CD compilations from my huge music collection, and a 650MB CD will hold about 15 - 20 songs depending on the song length.
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macintosh.
if you just want to make the files smaller, then you need to compress the AIFF files into mp3's. you can do this a couple different ways. MPegger is a good program (os9 only afaik) for this.
or you can just use itunes. in itunes, goto the advanced menu/convert to MP3. ithen you just select the file on your HD and itunes will rip it to mp3 for you and save it wherever it normally would save a ripped CD. itll probably save it in a folder called "unknown artist" if my memory serves correctly.
is that what youre asking?
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Posting Junkie
Join Date: Nov 1999
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.AIFF is *uncompressed* audio at CD resolution (44,100 samples per second at 16 bits per sample).
44,100 samples * 16 bits = 705,600 bits per second
705,600 / 8 bits per byte = 88,200 bytes per second
88,200 bytes per second * 60 seconds per minute = 5,292,000 bytes per minute
5,292,000 bytes per minute / 1024 bytes per kilobyte = 5167.97 kilobytes per minute = 5.05 MB per minute PER CHANNEL.
5.05 MB per minute * 2 channels (stereo) = 10.1 MB per minute, stereo.
It is quite amazing that .mp3's sound as good as they do considering the enormous compression involved.
-spheric*
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