Changing audio recording depth and sample rate in QuickTime Pro?

Last week, I set up QuickTime Pro 7.4.5 to record audio in 24-bit, 48 KHz format -- only now, I can't remember how I did that. I think that I may have used some other software to change the settings of my Mac Pro's built-in sound card. Does anyone know how to do this?
I made several such recordings, just last week, as a test, simply using a microphone plugged directly into my Mac Pro, and using QuickTime Pro as the recording application. During playback of such QuickTime audio files, I can hit <command-i> to see that the recordings are indeed 24-bit, 48 KHz. But now, when I repeat the same process, my QuickTime audio recordings are made with 16-bit resolution, at 44.1 KHz. I remember putting the settings back to those values after my recording session of last week. But I can't remember how I adjusted those settings. Does anyone know how to do that?
Thanks.

Thanks for your response.
I will use Apple MIDI Setup, as you suggest.
I want to change the sample rate to 48 KHz, as the final destination is DVD and I don't want to convert from 44.1 to 48 and thus suffer a possible loss in quality.
As for bit depth, I want to sample at 24-bit, since I'll be processing the sound afterwards and don't want audible rounding errors during the number "crunching". Afterwards, I'll just drop the eight least significant bits, or perhaps round them up or down (to zero or 256).

Similar Messages

Internal handling of Bit Depth and Sample Rate

I am wondering if iTunes allows accurate import of 48KHz/24bit files or whether it will convert to 44.1KHz/16bit as default. There is contradictory information in the Internet.
Thanks.

I just experimented on my machine, which is running iTunes 8.1. 48/24 WAV files can be added to iTunes. When adding to the library, it does not change them.
However, if you use iTunes as a conversion tool, it cannot create 48/24 files. The highest it can go is 48/16. That may be the source of the seemingly contradictory information that you read.
I did not try syncing the iPod. However, based on past problems with 48/16 files, I would not be surprised if the iPod has a problem with 48/24 files.

Bit Depth and Bit Rate

I have a pre recorded mp3 VO. I placed it into a track bed in GB. Clients wants a compressed audio file with bit depth: 16 bit and bitrate: 128kps max, but recommends 96kbps. If I need to adjust the bit depth and bite rate, can I do it in GB? and if so, where? Thanks for any help.

Please be aware that Bit Depth and Bit Rate are two completely different things!
They belong to a group of buzz words that belong to Digital Audio and that is the field we are dealing with when using GarageBand or any other DAW. Some of those terms pop up even in iTunes.
Digital Audio
To better understand what they are and what they mean, here is a little background information.
Whenever dealing with Digital Audio, you have to be aware of two steps, that convert an analog audio signal into a digital audio signal. These magic black boxes are called ADC (Analog Digital Converter) and “on the way back”, DAC (Digital Analog Converter).
Step One: Sampling
The analog audio (in the form of an electric signal like from an electric guitar) is represented by a waveform. The electric signal (voltage) changes up and down in a specific form that represents the “sound” of the audio signal. While the audio signal is “playing”, the converter measure the voltage every now and then. These are like “snapshots” or samples, taken at a specific time. These specific time intervals are determined by a “Rate”, it tells you how often per seconds something happens. The unit is Hertz [Hz] defined as “how often per seconds” or “1/s”. A Sample Rate of 48kHz means that the converter takes 48,000 Samples per second.
Step Two: Quantize (or digitize)
All these Samples are still analog, for example, 1.6Volt, -0.3Volt, etc. But this analog value now has to be converted into a digital form of 1s and 0s.This is done similar to quantizing a note in GarageBand. The value (i.e. the note) cannot have any position, it has to be placed on a grid with specific values (i.e. 1/16 notes). The converter does a similar thing. It provides a grid of available numbers that the original measured Sample has to be rounded to (like when a note get shifted in GarageBand by the quantize command). This grid, the amount of available numbers, is called the Bit Depth. Other terms like Resolution or Sample Size are also used. A Bit Depth of 16bit allows for 65,535 possible values.
So the two parameters that describe the quality of an Digital Audio Signal are the Sample Rate (“how often”) and the Bit Depth (“how fine of a resolution”). The very simplified rule of thumb is, the higher the Sample Rate, the higher the possible frequency, and the higher the Bit Depth, the higher the possible dynamic.
Uncompressed Digital Audio vs. Compressed Digital Audio
So far I haven’t mentioned the “Bit Rate” yet. There is a simple formula that describes the Bit Rate as the product of Sampel Rate and Bit Depth: Sample Rate * Bit Depth = Bit Rate. However, Bit Depth and how it is used (and often misused and misunderstood) has to do with Compressed Digital Audio.
Compressed Digital Audio
First of all, this has nothing to do with a compressor plugin that you use in GarageBand. When talking about compressed digital audio, we talk about data compression. This is a special form how to encode data to make the size of the data set smaller. This is the fascinating field of “perceptual coding” that uses psychoacoustic models to achieve that data compression. Some smart scientists found out that you can throw away some data in a digital audio signal and you wouldn’t even notice it, the audio would still sound the same (or almost the same). This is similar to a movie set. If you shoot a scene on a street, then you only need the facade of the buildings and not necessary the whole building.
Although the Sample Rate is also a parameter of uncompressed digital audio, the Bit Depth is not. Instead, here is the Bit Rate used. The Bit Rate tells the encoder the maximum amount of bits it can produce per second. This determines how much data it has to throw away in order to stay inside that limit. An mp3 file (which is a compressed audio format) with a Bit Rate of 128kbit/s delivers a decent audio quality. Raising the Bit Rate to 256bit/s would increase the sound quality. AAC (which is technically an mp4 format) uses a better encoding algorithm. If this encoder is set to 128kbit/s, it produces a better audio quality because it is smarter to know which bits to throw away and which one to keep.
Conclusion
Whenever you are dealing with uncompressed audio (aiff, wav), the two quality parameters are Sample Rate [kHz] and Bit Depth [bit] (aka Resolution, aka Bit Size)
Whenever you are dealing with compressed audio (mp3, AAC), the two quality parameters are Sample Rate [kHz] and Bit Rate [kbit/s]
If you look at the Export Dialog Window in GarageBand, you can see that the Quality popup menu is different for mp3/AAC and AIFF. Hopefully you will now understand why.
Hope that helps
Edgar Rothermich
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

Having trouble with wav files and sample rates

Hi ,I am having trouble with wav files and sample rates .I have been sent multiple projects on wav as the main instrumental ; I wish to record in 48.000kHz .Now comes the problem.When I try to change the project to 48k It seems to pitch up the track.I can't have them send the logic/project file as most have outboard synths,different plug ins etc.This particular case the producer has recorded the synth task in 41.000 kHz .My successful outcome would be to be able t create a project file in 48 kHz .And NOT pitch up whne I add the instrumenta wav file .Any help would be gratefully recieved,this is my first post so any mistakes I may have made go easy

You'll have to convert the actual synth audio file file that the producer gave you to 48kHz. You can do this in the audio Bin in Logic.

Supported bit depth and sampling frequency

Hi,
Is it possible to determine at runtime what sampling frequencies and bit depths are available for audio capture -- other than by trial and error? It does not seem that way from the API, but maybe I missed something, so I decided to post a question here. The only thing I was able to find so far is that 8-bit PCM WAV is required to be supported by all devices that support audio at all.
Thanks in advance for any info!
Sergei

Thanks for the info. I guess I was looking for something more specific - the exact bitrates and sample rates that Creative claims to support. Would you know where official and comprehensi've data can be had? There must be a tech spec somewhere.
It is common these days in business to see a recording of, say, a conference call or seminar presentation at 32k bitrate/025Hz, or even 24k bitrate/8000Hz, posted to a company's website for download by those who could not be there, and MP3 players are increasingly used for their replay. Companies use low digitization rates because there is no need for hifi and the files are much smaller: less storage, faster download.
I'd be surprized to think that Creative don't have compatibility with the standard range of rates offered by ubiquitous programs like Audacity and dBpower, the latter being one they themselves recommend!

Transferring music recorded at 32kHz sampling rate

In my project transferring music from DAT tapes to HD, I've run into a problem. A few tapes were recorded at 32kHz sampling rate for longer recording time.
STP can record at 32kHz so in theory I can transfer music digitally. But there is no sound when I monitor the tape and the Audio MIDI setup doesn't have a 32kHz option to choose for recording.
Can someone steer me in the right direction to get this music off the tapes? Is recording to the line analogue input the only way?

The problem is not with STP, the problem is with the hardware. if you want to record at 32Khz, you'll need an audio interface that is 32Khz compatible and I don't think the Mac's built-in audio is. Otherwise, we could select that in the AudioMidi Setup.

Finder - audio file info - bitrate, sample rate, etc

Is there a way to find out what bit rate and sample rate an audio file is without opening it in QT and then CMD+I from there?
I don't see detailed info when I get information from Finder. Is a script or anything that will allow me to find this info quickly in Finder?

juhani h. wrote:
Works fine here, too. But make sure you´ve ticked the box "Convert audiofile...etc", like M-Dan pointed out.
I tested it and if unchecked the imported file plays at the wrong speed. Amusing at first, but potentionally disastrous.
/J
Does NOT work in repeated tests on my system, and yes, the 'convert audiofile' box is ticked. Wouldn't report it as a bug if it wasn't....
This almost ruined a session of mine and cost me a deadline, but luckily I caught the SNAFU in time and converted the files individually.
Very odd though to hear that it works on some users' systems. How can this be a system specific bug? Are you sure you're dragging files in from the Finder to your arrange page? And Logic converts them? Are we talking 48k files being converted to 44? Or vice versa (44 to 48)?
In my case, it was a 48k session and Logic failed to convert the 44k files I had mistakenly been sent.
Since I've noticed other weirdness (like malfunctioning Apple Loops) at 48k, I still think Logic is less than bullet proof at different sampling rates. Just a hunch though.
T

The selected combination of bit rate and sample rate is not allowed.

I've always burned my purchased CDs into iTunes using a AAC 320 kbps and 48.000kHz. Now when I select that option in iTunes 9 I'm getting a "The selected combination of bit rate and sample rate is not allowed." pop up screen. So is it impossible to burn my albums in a 320kbps/48.000 AAC format?. I had no problems in previous versions of iTunes using this setting. I guess I might have to switch over using a MP3 import setting instead.

Audio CDs are encoded with a sample rate of 44.1 kHz. Ripping them at 48 kHz requires resampling and does not improve the quality. Unless you have a special need for 48, use 44.1.

"current encoder settings for bit rate and sample rate are invalid" message

I have some files I am working with. Details and what happened:
Had some music files where I was doing some trimming/splitting. Files worked fine in itunes.
Open the files in Quicktime Pro 7 to trim them. Exported to aif.
Opened the files with itunes. They open and play just fine.
In Itunes I click"create AAC version" to convert them.
I receive the message "An error occurred while trying to import the file. The current encoder settings for bit rate and sample rate are not valid for this file."
I don't know what to do from here. Suggestions?
Thanks.

Make sure that the AIFFs that you export are set for 16 bit PCM.
Also, assuming that you are using 44.1 kHZ sampling in your AIFFs, make sure that you are not trying to use 48 kHz in the AAC.

In Finder how do I get iTunes to show bit rate and sample rate of an entry?

In Finder how do I get iTunes to show bit rate and sample rate of an entry so I can set my DAC?

TonyEyes wrote:
In Finder how do I get iTunes to show bit rate and sample rate of an entry so I can set my DAC?
Tony, Make sure you are in Songs view. Then View > Show View Options, and check the boxes for "Bit Rate" and "Sample Rate." See picture:

Why do I keep losing audio/recorded tracks and SFX in my projects? I have tried: Saving as archive file/searching package contents etc. to no avail. Can anyone help?

Why do I keep losing audio/recorded tracks and SFX in my projects? I have tried: Saving as archive file/searching package contents etc. to no avail. Can anyone help? It keeps telling me 'Audio file not found', and seems to be different tracks in the same project each time too.

iamthewaughrus wrote:
I also have this problem using Garageband in a school network situation when students open their project on one station, save it to their network drive, and later open it at a different station. 90% of the time there will be no issue, but sometimes audio files are lost. (Garageband '11, iMacs)
That sounds like it might be a failure of the students to perform a Save As and check Archive Project when they do. This asks GB to pull all the files it needs into the associated .band document rather than point to them externally (and then risk not having them be there).

TS1717 when trying to import cd the following message appears "the current encoder settings for bit rate and sample rate are not valid for this file"?

Trying to import cd when this message appears "the current encoder settings for bit rate and sample rate are not valid for this file". Any suggestions?

Thanks so very much. I chose MP3 and Download and it is working beautifully. Have a wonderful day and it is so nice of you to get right back to me. I'm trying to cut a DVD for my grandson's grad party and I got most of the photos and didn't have any music since I lost everything in a clean install. Could hug you!

Audio only, green and purple screens on quicktime on pc

audio only,green and purple screens on quicktime on my pc

Open your QuickTime control panel (either via the Control panels, or by going "Edit > Preferences > QuickTime Preferences" in the Quicktime Player). In the Advanced tab, uncheck Enable Direct3D video acceleration:
... and click OK. Quit and restart the QuickTime Player prior to checking to see if the settings change has had any effect.

My Mac HD says that I have Quicktime Software, all that I find in my applications is Quicktime Player. And I cannot unlock Quicktime Pro in this program through its preferences.. help?

My Mac HD says that I have Quicktime Software, all that I find in my applications is Quicktime Player. And I cannot unlock Quicktime Pro in this program through its preferences.. help?

http://support.apple.com/kb/DL923?viewlocale=en_US&locale=en_US
Install and register this version. It installs in the Utilities folder.

I downloaded quicktime 7 to my pc and I purchased the quicktime pro upgrade and have a registration key. How do I upgrade it

I downloaded quicktime 7 to my pc and I purchased the quicktime pro upgrade and have a registration key. Now how do I upgrade it.

Go into the preferences and there will be a tab for registration
http://www.apple.com/quicktime/pro/unlock-mac_osx.html

Changing audio recording depth and sample rate in QuickTime Pro?

Similar Messages

Maybe you are looking for