Suggestions for bit rate for books on cd

Hi
I'm trying to clear some room on my ipod. Thus far I've been importing everything at 192. I'm hoping to reimport some of the books on cd that I've put on and would like some suggestions as to how low of a bit rate I can use without affecting sound quality too much (I tried 96 and really couldn't tell the difference).
Thanks
Evelyn

Hi, Evelyn.
For spoken word recordings, 32 kbps is generally considered an acceptable setting.
And, for what it's worth, that's the Bit Rate for Audiobooks purchased from the iTunes Store.
EDIT: You may also want to have a look at these suggestions: Link

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Make sure that the AIFFs that you export are set for 16 bit PCM.
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Thanks for all your help, David S, but the point is
that I have tried many different bit rates, from 4.0
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Short Answer for Bit Rates...

Greetings!
I am doing a second version of my 90-minute 4:3 SD MPEG-2/Dolby2 DVD.
This second version is only 50 minutes.
Can someone please help me with maxamizing my Bit Rates for 50 minutes?
I want as much video quality as recommended for newer home DVD players.
From FCP 5.04 (with all render files trashed), I Export> Compressor:
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Thanks.
I did the 50-minute MPEG2 at Constant Bit Rate (one pass), 7.0 and Best.
It turned out as good as I ever got from iDVD which is okay.
After hanumang's tip on the Compressor 2-pass VBR "BUG" --- I finally realized what was "wrong" with my 90-minute (2-pass VBR) DVD.
In fact, pixelation looked so goofy I ate all the time and completely redid the 90-minute MPEG2 at CBR 7.0 & Best and it looked as good as the 50-minute DVD.
+++
Not to be too negative, but my experience with Apple's "professional" MPEG-2 VBR encoder is very disappointing -- the version I paid a lot of money for is clearly sub standard and would have been an embarrasment to send out.
I read here that they have fixed it in a .1x (?), but that fire drill is more than a week away, no help now, (plus $50 that I mailed today).
+++
In any case, I've completed my 2-DVD project and would like to thank everyone who helped me.
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I’m new to the iTunes/iPod thing. A friend told me that he re-sets the bit rate from the default of 128 kpbs to the top of 320 kbps for better quality. [He plays everything off of his computer which is wired to speakers throughout his house and does not travel or drive much so hardly uses his iPod.] I played around a tad with the various rates on the same album and found that a fairly short one used 34.9 MB at 128 kbps, 52.1 MB at 192 kbps, 60.8 MB at 224 kbps and 86.6 MB at 340 kbps. Another friend told me that he noticed a big difference when he played a song off his iPod through his several thousand dollar system if it was imported at 128 kbps. While hard disc space is cheap and I would simply opt for the higher quality setting, the iPods are not so big when one almost triples the file size.
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Monty, this is really going to be up to your ears to decide. All I can tell you is my experience during the 2+ years of owning an iPod. I initially thought AAC @ 128 was satisfactory. I then started experimenting with various bitrates, but kept the AAC format. I decided that 192 was a discernible improvement over the 128. Not to go into a lot of detail, but I, quite by accident, had one album download at 256 & thought, "Wow, this is unbelievably better sound, even over inexpensive computer speakers." At that point, I started importing everything in AAC @ 256 VBR which I feel is pretty darn close to CD quality sound. I have a 60GB iPod that I'm willing to sacrifice some capacity in order to ensure the best audio quality I can. This is also why I do not buy frequently from the iTunes store as I do not feel the 128 downloads are the best quality. I buy & my own CD's, now, to insure good quality. I will by the occasional song from the store when I do not care to buy the whole CD. Hope this helps!

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Hello MrWizzer
I am not sure what FMS version you are currently using.
Well, if you look at the sampe vod folder that ships with FMS4.5, it has files encoded @ 150kbps, 500 kbps, 700 kbps, 1000 kbps, 1500 kbps.
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How do I change the bit rate for dls?? How times can I download one song??

I'm new to iTunes. I already downloaded 3 songs when I realized that the default bit rate is 128Kbps. I tried changing the bit rate to 192Kbps with a (Variable Bit Rate) checked.....unfortunately when I downloaded the next 2 songs the bit rate turned out to be the same.
Do I have to restart Windows or iTunes before downloading again?
And now that I have 5 songs with a lower br than I wanted... in order for me to have(download) the song at the higher bit rate...Is it possible to download one song more than once?
Thanx.

You have no choice as to bit rate when purchasing from the iTunes Music Store. The official bit rate of all tracks there is 128 kbps (a very few have been reported to be at higher rates, but that's not a choice you can make, it's how the track was encoded by the record company). The setting in the iTunes Importing preference is for tracks you import from CDs only and has no effect on iTMS purchases.
Is it possible to download one song more than once?
No. Except in extraordinary circumstances, the iTMS allows only one download per purchase.
Forum Tip: Since you're new here, you've probably not discovered the Search feature available on every Discussions page, but next time, it might save you time (and everyone else from having to answer the same question multiple times) if you search a couple of ways for a topic before you post a question.
Regards.

What is the maximum bit rate for a short NTSC standard def DVD?

I have about 30 minutes of content from FCP that I want to put on a DVD.
At first I tried iDVD and had problems with burning (although I did somehow make one DVD). So I built the project on DVD SP and made a DVD. However, the iDVD version looked much better. I checked out the file sizes and saw that there was 2 gigs on iDVD and only 1.6 DVD SP. Then I discovered the encoding options on DVD SP and I was curious what is the recommended average and maximum bit rate should be for the highest quality, yet still works in most DVD players?
Thanks.

DVD Bandwidth
The rate is not based on running time.
Some thoughts on rates
7.2 - 8.0 seems to be the general consensus for discs from computers. I play more conservative for the reasson listed in that link

Optimal Audio Sample/ Bit Rate for DVD?

In using recorded material to add to DVDs for family and friends, that is, non-commercial, what is recommended formatting for the audio file? Soundbooth seems to default to 48000 Sample Rate/32 Bit but if I use that am I achieving anything over a simple 44100 Sample Rate/16 bit, since the human ear cannot detect above 20000Hz? I want the DVDs to sound as good as possible in STEREO.I don't want to cross-post, so sorry if this is wrong forum.
Thanks...

I'm not positive about this, but I think they used 48KHz simply because most professional audio/video gear uses that same sample rate. This makes it easier to tramsfer audio from DV, DAT, etc. without the need for resampling.
As for why 48 in the first place? This has to do with the Nyquist limit... and that's way too deep for this thread!
Higher bit depth is another thing all together: This represents the number of possible volume levels (dynamic range) of each sample. 16 bit has 65535 levels which is a dynamic range of 96 dB. This is fine for final delivery -- assuming that the audio was well-mastered at an appropriate volume level.
During recording and editing, however, where it is likely that adjustments to dynamics (compression, expansion, noise gating, fading) and effects will be applied, it is best to use a higher bit depth so that less information is lost (quantized) on successive transformations of the audio. It also will keep broadband noise from creeping in when the audio is amplified.
For example, if you have audio recorded in 16 bit and then you amplify it to be 20 dB louder, your dynamic range has decreased to 76 dB and the noise floor has been raised -- meaning there is a constant whitenoise "hiss" in the background.
32 bit audio is different. The dynamic range is sufficient enough so that moderately large amplification will not neccessarily result in audible background noise.
The 32 bit audio is then downsampled during mastering to 16 bit for final delivery (often with aid dithering, noise shaping, etc. to avoid distortion and give the "illusion" of greater dynamic range)
I do agree that 48 KHz is a little bit silly for DVD when the audio is AC3 compressed anyway. I am fairly certain that none of these ultrasonic frequencies will survive AC3 encoding -- even at high rates.

Compressor: setting max bit rate for VBR audio

Hi,
I am using Compressor 3 to transcode DV to H.264. I want to encode the audio to AAC VBR wtih a max bitrate of 256. Under the Settings tab, under audio, for VBR there is a slider from good to best. what does this mean in terms of max bit rates? How can you use this slider in a meaninful way?
There is a setting for Average Bit Rate, where you can select a value. do we konw what the max bit rate would be?
thanks
dan

Good question about the slider…and I really don't know the answer. Why don't you try a test: crank it to one extreme and then the other with a representative source file and see what impact it actually makes on the properties of the respective output files.
Good luck.
Russ

Suggestions for bit rate for books on cd

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