[vorbis] fitting lots of music into 10GB with Vorbis

[James Snook]

Mad Rachid!  MAD!  NO MORE CAFFINE!!

On Fri, 2002-11-01 at 22:30, Rachid wrote:
> Hey Martin,
> 
> I thought, let's use maths! :-)
> At the top of your playlist, there's written:
> 
> "Playlist length: 55 hours 24 minutes 31 seconds"
> 
> Let's convert that into minutes at first, which gives us 55*60+25=3325 minutes. 
> Now, we should convert that again, this time into seconds: 3325*60=199500 
> seconds.
> 
> Okay, now let's take a look at your disk size. Your crappy disk (that were your 
> words ;)) is about 10 GB large. Let's say Windows and some other programs will 
> cost you approx. 800 megs of space. That means 9200 megs are left over for 
> audio. We should convert that into bits. Bits? Yeah, bits! Here we go: 9200*
> 1000000=9200000000 bytes. We'll need to multiply that by 8 to get the amount 
> of bits available on your disk, so 9200000000*8=73600000000.
> 
> So, for 199500 seconds of sound, you'll have 73600000000 bits available. So 
> how many bits would you have available for one second? Let's see: 
> 73600000000/199500= approx. 368922 bits per second.  Now we'll convert 
> that into kilobits, so divided by 1000, we'll get the end value of 368,922.
> 
> Theoratically speaking, if you would use that bitrate, all your audio should fit on 
> your harddrive perfectly. However, Vorbis uses VBR, so you can't really stay 
> very close around that bitrate. Therefore, I think, your average should be under 
> this value. 
> 
> A value of 0.80 in the Vorbis codec will provide you with a nominal bitrate of 
> 256 kbit, and the avarage bitrate perhaps approaching or even exeeding the 300 
> kbit boundary. However, you'll defenitely stay under the 368 kbit.
> 
> Since Vorbis usually sounds a lot better than mp3, you shouldn't be worried 
> about ogg-files with a bitrate above 250 kbit. It should work very well with your 
> PA set. Here, in Dutch broadcasting, we use 256 kbit MPEG Layer 2 as audio 
> compression method, so your ogg-files will sound perfectly fine. :-)
> 
> I hope I've helped you out here Martin. Let me know if this was any usable!
> 
> 
> 
> Regards,
> 
> Rachid.nl
> 
> 
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