Guest Anonymous Posted January 16, 2003 Report Share Posted January 16, 2003 Gentlemen, I have some radio programs that I recorded onto 80 minute discs in LP4 mode. I am going to record the audio from my MD to my PC. I want the entire MD( ~ 5.3 hours) to fit onto one 700 MB CD-R. What MP3 compression rate should I use to 1. Utilize the highest rate and 2. Fill the CD-R as much as possible (refraining from going over 700 MB)? Thanks - Ramblin' Man P.S. This is for an archive - I am not concerned too much about sound quality but I want it to be as good as possible. Thanks again Quote Link to comment Share on other sites More sharing options...
Andy Posted January 16, 2003 Report Share Posted January 16, 2003 I would to a couple of test runs with different bit rates and stuff. They don't need to be long, just enough that you can pick out the differences. Once you have a couple of different versions, compare them (get someone to give you a blind test if possible) and make the decision. Also, do a recording using a low bitrate PCM encoded .wav file. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 16, 2003 Report Share Posted January 16, 2003 To fit 320 minutes of music onto a 74 minute CD you obviously need to compress by a factor of 320/74, or 4.32. The bit rate of uncompressed CD-quality PCM stereo is 1411200bps. Dividing by 4.32 gives you a maximum bit rate of around 320kbps. Learn the math, it's not that hard. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 16, 2003 Report Share Posted January 16, 2003 Andy, Thanks for your suggestions. I will try them this weekend. Guest, I was looking for a quick and simple answer as I assumed that there would be people here who had performed similar tasks. Thanks for your suggestion that I should learn the math. I'm sorry for being naive, but I only got as far as Calculus II in college. Perhaps you should brush up on your reading comprehension skills as I said a 700 MB CD-R which would be 80 minutes, not 74. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 16, 2003 Report Share Posted January 16, 2003 Wow, 320/80, that's even harder. A shame your classes didn'tteach you how to think for yourself. Quote Link to comment Share on other sites More sharing options...
Bazirker Posted January 16, 2003 Report Share Posted January 16, 2003 Now now guys. Let's settle down. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 17, 2003 Report Share Posted January 17, 2003 Wow, 320/80, that's even harder. A shame your classes didn'tteach you how to think for yourself. I travel quite frequently. What part of the country do you live in? Perhaps we can meet and talk about these compression rates. Quote Link to comment Share on other sites More sharing options...
me Posted January 17, 2003 Report Share Posted January 17, 2003 Wow, 320/80, that's even harder. A shame your classes didn'tteach you how to think for yourself.STFU. Have a nice day Quote Link to comment Share on other sites More sharing options...
Daijoubu Posted January 19, 2003 Report Share Posted January 19, 2003 To fit 320 minutes of music onto a 74 minute CD you obviously need to compress by a factor of 320/74, or 4.32. The bit rate of uncompressed CD-quality PCM stereo is 1411200bps. Dividing by 4.32 gives you a maximum bit rate of around 320kbps. Learn the math, it's not that hard.74mins CD = 650Mb 80mins CD = 700Mb 320mins = 5:20hours @ 320Kbps = 768Mb I would suggest you to improve your maths 256kbps would fit better, ending up with 614.4Mb If you want, you can try 291kbps (VBR) = 698.4Mb 8) Quote Link to comment Share on other sites More sharing options...
highlandsun Posted January 19, 2003 Report Share Posted January 19, 2003 Note that a 74min pure music CD actually holds much more than 650MB. At 1411200bps = 176400Bps, and 74 min * 60 seconds, you get an actual capacity of 783,216,000bytes. There's about a 13% per-sector overhead when writing data sectors vs audio sectors, which is why 74min CDRs are only spec'd at 650MB for data use. This is also why you can't simply divide the raw audio capacity by a compression ratio to yield an equivalent MP3 size; you have to factor in the data vs audio overhead. Quote Link to comment Share on other sites More sharing options...
Daijoubu Posted January 19, 2003 Report Share Posted January 19, 2003 Note that a 74min pure music CD actually holds much more than 650MB. At 1411200bps = 176400Bps, and 74 min * 60 seconds, you get an actual capacity of 783,216,000bytes. There's about a 13% per-sector overhead when writing data sectors vs audio sectors, which is why 74min CDRs are only spec'd at 650MB for data use. This is also why you can't simply divide the raw audio capacity by a compression ratio to yield an equivalent MP3 size; you have to factor in the data vs audio overhead.TOC + Error correction :shock: Quote Link to comment Share on other sites More sharing options...
Christopher Posted January 20, 2003 Report Share Posted January 20, 2003 I travel quite frequently. What part of the country do you live in? Perhaps we can meet and talk about these compression rates.rofl That cracked me up. I bet you'd talk about compression rates..or pounding him in the face. k Quote Link to comment Share on other sites More sharing options...
me Posted January 20, 2003 Report Share Posted January 20, 2003 I was thinking a different form of compression... :twisted: Quote Link to comment Share on other sites More sharing options...
Daijoubu Posted January 20, 2003 Report Share Posted January 20, 2003 I was thinking a different form of compression... :twisted:Speed compression rate? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 20, 2003 Report Share Posted January 20, 2003 Thanks to all the helpful people here who are intrested in MD, rather than stirring up trouble! I will begin working on my project this evening Quote Link to comment Share on other sites More sharing options...
Bazirker Posted January 21, 2003 Report Share Posted January 21, 2003 Hey "Me," what does STFU mean? Dude this is a funny thread. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 21, 2003 Report Share Posted January 21, 2003 Ok I have another question. Generally when I transfer my MD audio to my PC, I simply put my MD into my Sony MDS-JE510 which is connected to my C03 box which in turn is connected to my digital soundcard. In the case of a MDLP disc, I connect my 505 to the MDS-JE510 with Monster cables and go that route. I know I can connect the 505 directly to the soundcard and record, but my computer is electrically noisy and my recordings have a higher amount of hiss when I record 505 > PC. When I let my MDS-JE510 act as an external D/A converter my recordings sound much better. The thing is that in order for me to get a digital signal to the computer from the MDS-JE510, I need to put a MD in the unit and press PAUSE on the unit. My question is = Could my MDS-JE510 be harmed in any way by being on pause for 5.2 hours while I play a MDLP disc on my 505 through it? My MDS-JE510 is getting on in years and I want it to last as long as possible. Thanks, Ramblin Man Quote Link to comment Share on other sites More sharing options...
highlandsun Posted January 23, 2003 Report Share Posted January 23, 2003 On my JB920 I can put it into A/D passthru mode without inserting a disc. Just rec/pause with no disc inserted, and the unit does A/D conversion only. Check your 510 manual, it probably has the same feature. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 23, 2003 Report Share Posted January 23, 2003 Hey! I'll give it a try - Thanks Quote Link to comment Share on other sites More sharing options...
Andy Posted January 24, 2003 Report Share Posted January 24, 2003 Offtopic: STFU = Shut The Fridge Up - I'm not too sure about the 'fridge' though. I've heard it spoken, and it sounded like a word I'd never heard before. Possibly a different language On topic: Your unit should be able to handle a pause for long periods of time anyway. But as you've discovered, you can do it without having a disc in there Also, you can get some really good results from internal soundcards. Just they have to be really good internal soundcards . I know that some pro gear is going from external to internal because it is no longer effected by the noisy PC (I'm not sure why - possibly better shielding, possibly something else). The other option which can work really well is using an external CD burner with an audio in. This will do the trick and you can minimise the number of devices your signal has to go through (thus minimising noise), unfortunately, it is a little bit slower (and more expensive) Quote Link to comment Share on other sites More sharing options...
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