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Help needed from audio gurus...
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View this Thread in Original format
| Hydarnes |
Hey guys. There seems to be a little problem that's boggling me about certain audio files with same KBPS rates but disproportionate sizes.
I have one song that's 3:19 and another that's 3:53 in length (they are not the same song). Both songs show that they were ripped at 320kbps. But here's the problem. The first is 7.63megs and the latter is 8.90. If both are the same bitrate, how come the latter is 1.27 megs larger if it's only 34 seconds longer? Both are also on 2 Stereo and 44khtz.
What other factors would contribute to this dramatic difference in size? And lastly, does it even matter as far as quality is concerned if both are at the same kbps?
Thanks for your help!
Cheers
UPDATE: Corrected. Flavdave pointed out my mathematical error. |
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| flavdave |
| There's a problem with your subtraction. 8.90mb - 7.63mb = 1.27mb, not 2.27mb. The megabyte to second ratio is about equal. |
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| Zombie0729 |
also, you are not thinking in terms of sound data, just data in general.
a 8:00 minute 320 kbps isn't going going to encode the same as another 8minute 320 kbps.
some great resources here, http://www.mpeg.org/MPEG/mp3.html . too bad i can't find the article i actually wanted to show you. just wasted 20min of my life |
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| Plastick |
Your mistake has been pointed out by flavdave:
| quote: | | There's a problem with your subtraction. 8.90mb - 7.63mb = 1.27mb, not 2.27mb. |
There is a fixed way of calculating audio file size, meaning im saying about .wav here. Factors like channels(stereo/mono), length(in sec), bit resolution(bit), sample rate(kHz) are used in the calculation.
I remember seeing a technical thread by u asking on digital video here days ago. What's next in the MD forum man? 'How do u build a PC?' :haha: |
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| Hydarnes |
| quote: | Originally posted by flavdave
There's a problem with your subtraction. 8.90mb - 7.63mb = 1.27mb, not 2.27mb. The megabyte to second ratio is about equal. |
lol...how did I get my math so wrong? :o It still seems like too big of a difference for only 34 seconds though.
Plastick,
Yeah, I probably should have posted this elsewhere. It's a good afterthought anyway. :p |
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| Grrrrr |
3:19 = 199 seconds
3:54 = 234 seconds
320kbps = 40 kilobytes per second
199 x 40 = 7960kb = 7.77 megs
234 x 40 = 9360kb = 9.14 megs
Which is basically what you've got (it's a little bit more due to things like ID3 tags etc etc) |
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