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jfrick
Member
Joined: 26 Sep 2005
Posts: 1
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 Posted: Mon Sep 26, 2005 5:01 pm Post subject: How do you fit a 90 minute cassette onto a single CD-R? |
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I have been wrestling with this problem for months. I have hundreds of 90 minute music cassettes that I want to transfer onto CD.
Ideally, I would like to be able to put all 90 minutes onto a single CD, rather than splitting Side A and Side B onto separate CD-R's.
At first I tried 90 minute CD-R's...until I found that often they won't play after all the work you put into them.
Then I thought about compressing the data into MP3 format - but that won't play in any standard CD player.
Now I am wondering, if I compress a 90 minute WAV file into MP3 format, and save that MP3 file, then open the MP3 file and try to save it again as a WAV file if the size will stay the same, or if it will increase beyond the capacity of an 80 minute CD-R.
I didn't want to go out and buy an MP3 converter unless I am sure this will work, and that the sound quality won't suffer.
Anybody have any experience with this kind of problem, or any other suggestions as to how to solve it.
*** the industry for making the CD standard 80 minutes instead of 90 minutes!! |
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Guest
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| Posted: Tue Sep 27, 2005 1:31 am Post subject: Re: How do you fit a 90 minute cassette onto a single CD-R? |
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On Mon, 26 Sep 2005 17:31:52 GMT, jimfrick@aol-dot-com.no-spam.invalid
(jfrick) wrote:
| Quote: | Then I thought about compressing the data into MP3 format - but that
won't play in any standard CD player.
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I think most new CD players will play mp3 files. A new player might
have better luck with 90 minute CDs.
| Quote: | Now I am wondering, if I compress a 90 minute WAV file into MP3
format, and save that MP3 file, then open the MP3 file and try to
save it again as a WAV file if the size will stay the same, or if it
will increase beyond the capacity of an 80 minute CD-R.
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Encoding and then decoding will generally result in a .wav that's
slightly larger than the original .wav.
| Quote: | I didn't want to go out and buy an MP3 converter unless I am sure this
will work, and that the sound quality won't suffer.
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The sound quality will suffer, but mp3 encoders can do a pretty good
job. I can't hear the difference, but I have old, abused ears that
can't hear much over 16k. The LAME encoder is generally considered the
best encoder and it's available for free on the Internet.
Noik |
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Barry Watzman
Guest
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| Posted: Tue Sep 27, 2005 3:32 pm Post subject: Re: How do you fit a 90 minute cassette onto a single CD-R? |
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If you compress the file to MP3 and then convert it back to a wave file,
the file size (length in bytes) will be unchanged. Think about it: The
length of a wave file depends only on the clock playing time and the
sampling rate. Well, a song that is 3 minutes and 12 seconds long
remains 3 minutes and 12 seconds long through these conversions, and the
output sampling rate is 44,100 samples per second. That determines the
file size (in bytes), no matter how many wave to {whatever} and back to
wave conversions you run it through. Now no doubt, each conversion to a
compressed format (like mp3 or wma) and back will degrade the quality,
the content of those samples won't be the same. But as long as the
length and the sampling rate do not change, the file size will not
change either.
What I'd do is use high-bitrate MP3, not 128k but more like 160 to 320k.
At that bitrate, the quality loss should be inaudible, and you could
now get not 90 minutes on a single CD, but more like 600 to 700 minutes
-- or at least 6 or 7 of your tapes. Of course, the restriction is (as
you note) that a data disc containing MP3 files will not play on a pure
"audio" CD player, but there are now lots of CD players around that will
play MP3 discs (although most OEM factory car radios still will not).
By the way, the original CD standard was 70 minutes, not 80. But when
CD media was expanded from 650 megabytes to 700 megabytes, they managed
to pickup a few more minutes.
jfrick wrote:
| Quote: | I have been wrestling with this problem for months. I have hundreds of
90 minute music cassettes that I want to transfer onto CD.
Ideally, I would like to be able to put all 90 minutes onto a single
CD, rather than splitting Side A and Side B onto separate CD-R's.
At first I tried 90 minute CD-R's...until I found that often they
won't play after all the work you put into them.
Then I thought about compressing the data into MP3 format - but that
won't play in any standard CD player.
Now I am wondering, if I compress a 90 minute WAV file into MP3
format, and save that MP3 file, then open the MP3 file and try to
save it again as a WAV file if the size will stay the same, or if it
will increase beyond the capacity of an 80 minute CD-R.
I didn't want to go out and buy an MP3 converter unless I am sure this
will work, and that the sound quality won't suffer.
Anybody have any experience with this kind of problem, or any other
suggestions as to how to solve it.
*** the industry for making the CD standard 80 minutes instead of 90
minutes!!
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