Subject:Compressing Large Files to Burn CD's

Posted by: Shelly D

Date:8/29/2006 11:47:55 AM

Hello There!

I appreciate any help that ya'll can offer me. I actually do fairly well with a computer or things technical, but I'm by no means advanced.

I make recordings that last from 60-140 mins. I want to record them onto a CD. My understanding was that if I converted the say 90 minute .wav file to an MP3, I would then be able to record it onto a CD.

The problem I've run into is that in both formats, it tells me my file is too large. (my discis a standard 80 minute) It seems to me there should be a way to do this! Also, if I send files through the internet, which is a good file format to send that would speak to all computers? I communicate with people world wide.

Thank you in advance for your assistance

Shelly

Subject:RE: Compressing Large Files to Burn CD's

Reply by: kbruff

Date:8/29/2006 2:55:44 PM

There is a difference between data space and time space. Red Book CD"S which can be played in various standard cd players play audio from the time space point of view since you hear the audio in the time domain. Data CD's which contain compressed formats such as wave, mp3 etc require a decoding software in order to convert the data in something which can be heard in the time domain. This is confusing at first but just think about the data and how it is packed into a standard CD, additionally think about why it plays back at particular speed, and finally how cd players from different vendors are able to communicate with the data, well it has to do with a known standard which has some limits. The maximum time length of data you may put onto a standard CD for redbook compliance is 79 minutes and 58 seconds. However the cd contain be used strictly to store raw data, which will then require a deconder to generate the audio stream you enjoy in the time domain.

Various domains -- Time/Frequency/Space are interwined and play a major role in how we interpret sound.

-- Bye,

Subject:RE: Compressing Large Files to Burn CD's

Reply by: Geoff_Wood

Date:8/30/2006 2:49:12 AM

You can compress a file as an MP3 or WMA, and have much more than 80 minutes (many hours !!!) on it, but it will only play on a computer or CD Player that specifically plays MP3 files (usually only SOME discman or car players). It will not play at all in a standard CD player.

A standard CD player can only play regular CDs, which max out at around 80 minutes.

geoff

Subject:RE: Compressing Large Files to Burn CD's

Reply by: Shelly D

Date:8/30/2006 2:15:25 PM

Thank you both for posting these replys to me. I do have a better understanding now of what I'm doing. Since I want to offer this for people to play on any cd, I'm going to need to burn 2 CD's if it's a long time or see where I can edit

I was hoping to be able to click something and all would shrink, then I'd burn it on one CD. Oh well.

Many thanks again........

Shelly

Subject:RE: Compressing Large Files to Burn CD's

Reply by: pwppch

Date:8/30/2006 2:46:19 PM

If you want to get 120 min on a 80 min CD, you could try the time compress/strech process.

It will make it fit, but you have to decide whether the content is usable when you compress like this.

Peter

Subject:RE: Compressing Large Files to Burn CD's

Reply by: Shelly D

Date:8/30/2006 6:16:30 PM

Peter, is this what the other person was talking about? That it will distort the voices and perhaps only be played on a computer or MP3 player? If it will not distort the voices, I love it!

Would I look under the help menu for compression and stretch process?

Thanks for the info

Shelly

Subject:RE: Compressing Large Files to Burn CD's

Reply by: rraud

Date:8/31/2006 9:09:03 AM

A time compressed file burned as an audio CD would play as any normal audio CD would. However the time compressiion process leaves process artifacts depending how much is used. Essentially it speeds up (or slows down) the playback without changing the pitch. This can be done by speeding up a tape but you would get a key change, aka, the chipmonk effect.

What Geoff described was data compression. A 90 minute program would still be 90min, before and after rendering as an MP3.