Audio bit rate

Does anyone know how to change the audio bit rate in
Captivate 4? The Advanced Audio Management screen shows the bit
rate at 256kbps. I'd like to change that to 128 to see if it
reduced my file size but cannot find where to do that anywhere.
Please help!!!!

Welcome to our community, Mike
Click Edit > Preferences > Project node > SWF Size
and Quality node.
There you will find a slider control.
You may also wish to examine clicking Audio > Settings...
Cheers... Rick

Similar Messages

How do I adjust audio bit rate in MPEG-2 Program Stream?

I don't see any way to adjust the audio bit rate in the MPEG-2 Program Stream setting in Compressor 3.5.3. I need a specific bit rate of 224 KBps within an MPEG 1 Layer 2.
Thank you.

AFIAK, there is no way within the preset adjustments to change the audio – either in 3.5 or 4.0
Try this for a work-around. Choose the MPG-1 setting, open Inspector and disable Video. Adjust the audio rate to 224 in the Audio tab. Submit and you should get an audio stream. In a separate job choose the MPEG-2 settings. Open the Inspector>Encoder Tab>Extras and deselect multiplex. Submit and Compressor should spit out an MPEG-2 video stream. You should be able to multiplex them in Mpeg Streamclip. (The files need to have the exact same name prior to their respective extensions.)
Good luck.
Russ

IPOD Classic Which Video Audio bit Rate?

I recently purchased some software for converting movie files and non protected dvds to my ipod. The software companies support told me that the maximum audio bit rate for for video files is 56kb/s for ipod 30gb and 64kb/s for ipod 60gb. Now i know i haven't got these models, i have the classic but they still told me i can convert to 64kb/s in the audio bit rate for video files before convertion. Can someone please clarify this. The software does support however a maximum audio bit rate of 320kb/s for video files. I was going to use 128 or 160.
I found this link but it only explains as far as aac-lc:
http://www.apple.com/ipodclassic/specs.html

I just found something else out though, my conversion software maxes out at 160kb/s. So the iPod may support more, I don't know anymore. I still think the max is 160kb/s though, because that's all I could find when looking for it.

Audio bit rate (kbps) and file size balance

I'm new to Flash, and I'm trying to decide how to set the bit
rate (kbps) for my audio files.
I'm creating PowperPoint-like presentations with voice audio.
You can see what I'm doing at
http://preparatorychemistry.com/Bishop_Audio_Book.htm
I first decided on 16 kbps, but I'm not happy with how it
sounds, especially through headphones connected to the computer. My
presentations, of course, sound better with higher bit rates, but
file sizes roughly double for each doubling of the bit rate. At 16
kbps, my files range from 1-3 MB, so for 32 kbps (which I'm leaning
toward now), they are 2-6 MB. My questions are
What's the concensus on the best bit rate for Internet sound
files, especially voice?
How important is it to minimize files size? The files are
already large enough so that dial-up folks will probably not listen
to them, and even the larger files seem to download fast enough
with my cable connection.
Thanks for the help.
Mark

Chemistry guy wrote:
> I'm new to Flash, and I'm trying to decide how to set
the bit rate (kbps) for
> my audio files.
>
> I'm creating PowperPoint-like presentations with voice
audio. You can see what
> I'm doing at
>
>
http://preparatorychemistry.com/Bishop_Audio_Book.htm
>
> I first decided on 16 kbps, but I'm not happy with how
it sounds, especially
> through headphones connected to the computer. My
presentations, of course,
> sound better with higher bit rates, but file sizes
roughly double for each
> doubling of the bit rate. At 16 kbps, my files range
from 1-3 MB, so for 32
> kbps (which I'm leaning toward now), they are 2-6 MB. My
questions are
>
> What's the concensus on the best bit rate for Internet
sound files, especially
> voice?
The best is the import high quality sound in wav format. Than
in library you can
play around with m3p compression changing the rates and all.
Checking the quality
versus the file size and find one that suit your needs. There
is no BEST format to
import. Every single fill have individual setting. It's all
depends on the sound.
Like, in case of voice. Very different to other sounds.
Save it as ADPCM (adaptive pulse code modulation) or Mp3
9kbps as your second choice.
Also take note that STREAM always lower down the quality , it
suppose to load fast so flash reduce
it enormously , usually sound like pure crap, go to library
(CTRL L to open) right click your sound
and go to properties, adjust the compression and type of
audio format to find best size and quality...
> How important is it to minimize files size? The files
are already large enough
> so that dial-up folks will probably not listen to them,
and even the larger
> files seem to download fast enough with my cable
connection.
You would be surprised. I was doing voice overs two or 3
weeks ago for a client.
Needed 5 sounds , up to two minutes each, for different
slides. Ranging from 2.5 MB
to 2.9 MB per file.
After compressing all of them, I had 5 sounds in very good
quality of total size 1.4 MB
Best Regards
Urami
<urami>
If you want to mail me - DO NOT LAUGH AT MY ADDRESS
</urami>

Figuring out what audio bit-rate I filmed at?

I started making DV movies in 2003. I am not sure what the audio setting was (probably the default 12 bit). My camera is a Sony DCR-TRV33. Is there some way I can determine what the setting is on the miniDV tapes before I capture it with FCE? That way I can make sure I get the right speed. Could I use Image Capture to grab a small section of tape and open Quicktime Player and see if I can see what the characteristics are? Thanks.

When I open the viewfinder and play my first miniDV it says 16-bit; but I don't believe that that is correct. I don't believe I made any changes to the camera when I first got it. I hope R. Mitchell Fore is correct and that FCE will tell me if the captured bit rate does not match the camera.

Audio Bit Rate & Timeline Syncing

If I shoot video that captures 16-bit audio and I use the Sound Devices 702 recorder and I record audio for the same shoot at 24-bit, is there going to a syncing issue in the FCP Timeline?

The bit rate has nothing to do with sync. Video is driven by a control track, 60 little clicks per second (50 in PAL.) The various conventions for naming those clock ticks (drop frame and non-drop frame) is called timecode. The society of Motion Picture and Television Engineers came up with a standard: SMPTE time code. This is in wide, almost universal use.
Unless the audio device is running on the SAME clock, either jamming code from one device to the other, or separately, providing sync with a clapper slate or some other visual and audible cue, you will have sync drift. Period. The end. There is no fine print.
You MIGHT have success with short recordings. Or not.

How do you change Audio Bit Rate?

Hello. I need to export Mpeg Layer 2 audio with 8 bit sample rate. I can't find any place to change it down from 16.
Help!
Thanks, Chris

No worries. I checked it out. The file I output has to be Mpeg Layer 2 audio (plus it has video attached, It's an Mpeg video file with Mpeg Layer 2 audio).
I only saw .aiff, .mp3, .wav and .mov as export options from Audition... but I could make them 8 bit. I know 8 bit is becoming obsolete, but I wish there was the option within Premiere.
C

SEQUENCE SETTING: Audio Bit Rate

Is there any way to get 24-bit audio in a sequence or project setting? We see no option to create a 24-bit project or 24-bit sequence in Premiere Pro CC.
We recently made the jump over from FCP 7 to Premiere Pro CC and we are hoping this is an ‘audio works differently in Premiere’ issue.
We have been editing ProRes (422HQ) as that is how our broadcast clients require final delivery. We edit with ProRes (HQ) files with 24-bit audio. We have also have attempted to create a sequence based on the clip settings. We figured everything is working as expected...we also get our final mix from our audio designer 24-bit.
However, when we are ready to deliver our mixed master, we go to 'Export Media', and attempt to send out our sequence via 'Match Sequence Settings', as we want the specs we set up. BUT, Premiere reveals to us the audio is 16-bit (even though 24-bit audio is in the timeline). Yes, if it’s unchecked we can create a custom 24-bit preset. But that's like dubbing a dub, losing resolution (to put audio in video terms), and bumping it back up. As if Premiere is currently converting our 24-bit audio to 16-bit in our sequence, thus forcing us to convert a lower quality audio (16-bit) from the timeline, back to 24-bit for the exported master?
This seems like it would be detrimental to the quality of our audio delivery and our standards. How can we use the original 24-bit audio file from our designer? Why does the Match Sequence Setting say our audio is 16-bit when it is not?
Can we adjust the audio settings in Premiere Pro CC project or sequences to reflect a 24-bit audio.
Thanks in advance!

Exactly..
So how do I ensure the 24-bit audio in my sequence is being used properly...the Match Sequence Setting (which I don't use) is saying my sequence is 16-bit, and that's deceiving if it's not...Why would Premiere 'think' that, especially when we have only 24-bit audio files in the timeline and project.
The MS Setting drop down menu is not giving me the trust of what is natively in my timeline, when it's displaying it's 16-bit. Therefore, it's not giving us the confidence Premiere is handling my audio correctly...How do I know Premiere is using my 24-bit audio during that manual export?...cause to me, Premiere's thinking it's 16-bit.
Is it downgrading the audio int the timeline? And am I bumping it back up when I do it manually? That's not good, and unacceptable for broadcast.
Hope that was understandable.
Thanks!

How do I change the audio sample rate from 48kHz to 44.1kHz for Mpeg2

Hey all,
I've been searching for a while but haven't found any direct answers in the forums or the user manual so here goes.
I have to dispatch a file to Bloomberg TV and the file specs they have given me are as follows:
Video Standard: MPEG-2, MP:ML, 4:2:0
Frame Rate: PAL 25fps
Video Size 720 x 405
Aspect Ratio 16:9
Audio Standard MPEG-1 Layer 2
MPEG-2 Program Stream Mux rate 6mbs per second
Bit Rate Type: CBR
Video Bit Rate 5.7mbs
Audio Bit Rate 192kbs
Audio Sample Rate 44.1Khz
Interlacing: Upper Field first (why they want interlaced for web streaming is beyond me)
GOP Structure: IBBP
I-Frame distance 12
Now everything above is fine except the audio encoding because even though I have set up a new setting from scratch I cant find anywhere to adjust the audio sample rate. The Inspector tells me the Audio encoder is set to:
Format: MPEG
Sample Rate: 48.000kHz
Channels: 2
Bits Per Sample: 16
Anyone Know how or even if I can change these audio settings? The only adjustments I can find are the filters or the transport/program stream option. I have it set to program as specified by Bloomberg.
Thanks in advance
J

The only setting that I could find in compressor that lets your change the bitrate to 44.1 is when you create a new dolby digital setting and then under the inspectors audio tab/Target System button, change the button to Generic AC-3. When done, you can change the Sample Rate to 44.1.
Hope this helps?

'f4v' export bit rate ignored, but 'flv' OK - general bug?

I have been testing the f4v and flv export options in P.Pro CS5.
If I use a FLV preset, note down the video bit-rate and the audio bit rate, then the exported file comes out the expected file size.
If I use the equivalent F4V preset, the file comes out 2 to 3 times larger than it should.
Test source is 720*576 16:9 avi, 25 fps, length 16 seconds.
Web preset of 900kbps selected:
Output f4v 768*432 using 900 kbs (850 video +48 audio) produces 3694kb file = 1.80 megabits per sec.
Output flv 768*432 using 900 kbs (804 video +96 audio) produces 1943kb file = 0.95 megabits per sec.
So I have 2 observations:
1) f4v seems to be inefficient compared to flv - but to keep things simple, I won't compare apples with pears.
2) For a given data rate (900kbps in this case), that should be the output, regardless of image size, frame rate, index frames etc etc.
I have done a number of other tests on P.Pro for f4v and flv presets which shows f4v to be 2* the file size it should be.
The preset 'name' reciting 900 kbps ties in exactly with the video/audio components in custom panels, so it's not a case of pre-sets having wrong names.
I have aAdditionally I have done similar tests in encore CS5's new export feature, where f4v is up to 3.5 * bigger than it should be for stated data-rate.
(Yes, I have ignored the index and swf files etc produced by encore from this calculation).
I am expecting this to be a general bug, so would be interested to know if others encounter same problem, before requesting adobe to fix the software.
Format f4v did not exist on CS2 and seems to be OK on CS4, so this is purely a CS5 question.

Thank-you Jim.
PP version 5.0.3.
AME 5.0.1.0
Good thinking on version number, I just did a small update, following CS5 instalation/update 1 month ago.
I was already on same version numbers and the 20mb 'extension' update hasn't changed anything.
I usually export direct ftom PP, haven't got in to the habit of using AME yet, though with new fast pc and small test clips I haven't really needed it, but tried via AME to see if had different results but resulting file is 3706KB (1943 KB via flv).
The 'expected file size says 1MB (though 2MB would be nearest integer for expected results).
Importing f4v output back into PP, properties give me:
File Path: D:\adobe_tests\z1e_1_768_432_900.f4v
Type: MPEG Movie
File Size: 3.6 MB
Image Size: 768 x 432
Pixel Depth: 32
Frame Rate: 25.00
Source Audio Format: 44100 Hz - compressed - Stereo
Project Audio Format: 44100 Hz - 32 bit floating point - Stereo
Total Duration: 00:00:16:01
Average Data Rate: 231 KB / second
Pixel Aspect Ratio: 1.0
I gave it a try with no audio and output is 3597KB, so it's not something wierd in audio codec.
Your NTSC content being around 25% bigger no doubt means more compression to maintain preset data rate, which is to be expected.
I don't have any 30 fps content, so did tests using 30fps output, from same preset and same 25fps source.
I don't have any NTSC frame rate media, but I used a 25fps source/sequence and selected output as 30fps which still resulted in an oversize file, but less drastic at 2.6MB (flv 2273KB for 25fps to 30 fps output, other things equal).
File Path: D:\adobe_tests\z1e_1_768_432_900_30fps.f4v
Type: MPEG Movie
File Size: 2.6 MB
Image Size: 768 x 432
Pixel Depth: 32
Frame Rate: 30.00
Source Audio Format: 44100 Hz - compressed - Stereo
Project Audio Format: 44100 Hz - 32 bit floating point - Stereo
Total Duration: 00:00:16:01
Average Data Rate: 165 KB / second
Pixel Aspect Ratio: 1.0
There is little more I can think of to check as the mysterious bit is in the black hole of dll's.
A few more cross checks please Jim:
I am on win7 pro 64 bit.
Codec on output for f4v preset is Mainconcept H.264 Video.

IPod nano 5G bit rates

I'm trying to look for them but I can't find them. Does anyone know the video bit rate and the audio bit rate (or the combined number) for the iPod nano 5G video camera?

Hi I tried this from: Zolved.com +Toggle the Hold switch to on, then back to off (none of the red is showing).+
+Press and hold down the Menu and Select buttons for 10 seconds (until you see the Apple logo) as shown in the picture.+ And it appears to have worked, so am guessing this is the standard way of re-setting the Nano? Thanks

Optical audio out bit rate

I downloaded some 96khz/24bit flac files and tried to play them on my MacBook of late 2007. First, I used Songbird to play the files and hook up my Cambridge Audio DacMagic via USB but observed that the output was only at 44.1khz, I.e. just CD quality. Then I read that that's the limitation of USB audio and so I bought a toslink cable to feed the DAC via optical out. Well, it was still only 44.1khz. Wondering if Songbird changed the bit rate, I tried converting the flac file to apple lossless with XLD and then importing into iTunes. iTunes clearly show the files being 27xxkbps and yet my DAC still indicate it is receiving only 44.1khz sample rate. Is this the limit of the MacBook sound card? I could not find this answer from anywhere on apple's website.
When I use AirPlay to stream the file via apple tv and feed apple tv's optical out to my DAC, it showed 48khz. A little better. But I'm really after the full bit rate of 96khz for optimum audio quality.

Hi Maclover,
cheers for the fast reply! Yep that did the trick - typical, the panel was in the only place I didn't think to look, Doh!
Cheers again.

No E-Mail Updates or High Bit-Rate Audio Using WiFi

When I use WiFi and click on the mail icon, my 3GS will not update my e-mail messages. The network activity icon just keeps going and going. Additionally, I cannot get audio streams over 128k on apps such as Wunderradio. Everything works fine on 3G networks and I have enabled the high bit rate option for the apps that have such an option.
The two problems happen on all Wifi networks, so the problem isn't my home network
Anyone else have this problem or know how to fix it?

Yes. I am able to surf the internet and do everything else except for the two problems I outlined in my original post. The icon switches from 3G to the WiFi "fan". Using the Speedtest.net application I have checked my WiFi connection and it is usually at 4,400 kbps download and 1,000 kbps upload.
In case someone asks: I am using an att.net e-mail account, but have also tried my comcast.net account with the same results.
Message was edited by: Chip_Nashville

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

Variable bit rate audio assets cannot be imported

Extracted some ac3 files from personal content DVDs I authored and burned myself (using DVDSP) to make a compilation. When I try to import these 5.1 ac3 assets, DVDSP is refusing stating: "Variable bit rate audio assets cannot be imported." These ac3 files play fine in QuickTime and other programs that handle ac3 files.
Can anyone help?

Hi:
Please give us some info about the original movie/audio formats and what encoding presets you used in Compressor.
Alberto

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