24 bit audio output over USB

I'm trying to stream hi resolution digital audio files (24/96 ) via a USB connection to my DAC. There is a software limitation of 16/48 it seems with the standard OS X USB drivers as the DAC only sees 16/48 via USB but can see 24/96 if I use the mini Toslink input. I would like to use this input for another source however. Is there any way around this? Any open source USB drivers that can handle 24/96?

answered it myself!

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Problem sending FCP X audio output over USB connection

I have an Antelope Eclipse digital audio converter/monitor controller. It connects to my Mac Pro via USB.
I can play audio just fine out of Pro Tools HD Native at any sample rate.
However, I have just discovered that the audio from FCP X is distorted and "wobbly"......apparently there is a sample rate sync problem between FCP X and the Eclipse.
The audio in question is Linear PCM @ 48kHz.
Is there a problem with FCP X sending audio out through a USB 2.0 connection?
Do I need to change some FCP X settings?

Thanks for the input. Yes, I am aware of possible latency issues. I would stay with low latency sound cards like the Pro Tools card, which worked fine. There would be no D/A conversion, so latency is usually not an issue.
I have asked about compatibility with sound cards in a separate thread, just to be sure any sound card that the Mac Pro recognizes will work:
https://discussions.apple.com/message/18579263#18579263

24 bit Audio through 16 bit Audio Output

Possibly dumb question but...
I have 24 bit audio files recorded on other equipment. If I edit them in Audition at 24/32 bit but my audio hardware and/or output driver is only 16 bit will that affect the audio processing quality of what I'm doing within Audition?
The output is simply to connect speakers or headphones but everything else such as outputting the processed file to hard drive will be done internally from Audition (i.e. Save As - no mixdowns through external analog outputs or anything).
Will the audio stay 24 bit quality when using 16 bit audio hardware output for monitoring?
Thanks.

No, the files within Audition will be unaffected by the available bit depth of your soundcard. The only time it would matter is, for instance, if you are making CDs from your audio files or feeding digital out to an external 16 bit recorder in which case you will need to down convert your 24 bit files to 16 using dither for best results when you have finished all the editing/processing. But keep the 32 bit files in case you need to go back and do any adjustments.

Audio output to USB cable

I want to play audio from my MacBookPro (13inch) through my Roberts stereo which has a standard USB port, which can be selected as the source for playing through the speakers. Does anyone know of a cable I can use to connect the audio output on my MacBook to the USB input on my stereo?
I would have thought this was a pretty standard conversion but cant find anyone selling something with a 3.5mm jack on one end and a USB jack on the other?
Thanks in advance!

MarvUK wrote:
I want to play audio from my MacBookPro (13inch) through my Roberts stereo which has a standard USB port, which can be selected as the source for playing through the speakers. Does anyone know of a cable I can use to connect the audio output on my MacBook to the USB input on my stereo?
I would have thought this was a pretty standard conversion but cant find anyone selling something with a 3.5mm jack on one end and a USB jack on the other?
Thanks in advance!
Why don't you use the USB port on your computer to get the audio out? USB to USB.
Message was edited by: BobTheFisherman

PS4 Audio output to USB Headset and HDMI

Hi, I'm having an issue with the audio output from my PS4. I have a capture card (Elgato Game Capture HD) which is connected to my PS4 through the HDMI cable. I also have a Sony Gold Wireless Headset. Whenever I connect the headset using the USB bluetooth connector and have the audio settings set to allow the headset to receive both Chat and Game audio, the game audio going through the HDMI - and thus the Elgato - is muted. Whenever I set the headset to receive just Chat audio, this then unmutes the HDMI game audio. I would like to be able to receive game and chat audio through the wireless headset, whilst also having game audio through the HDMI, however I have as yet not been able to find a setting to allow this. My question therefore is, is it possible to have game audio through the HDMI whilst also using a headset receiving game audio? Thanks in advance for any help.

MarvUK wrote:
I want to play audio from my MacBookPro (13inch) through my Roberts stereo which has a standard USB port, which can be selected as the source for playing through the speakers. Does anyone know of a cable I can use to connect the audio output on my MacBook to the USB input on my stereo?
I would have thought this was a pretty standard conversion but cant find anyone selling something with a 3.5mm jack on one end and a USB jack on the other?
Thanks in advance!
Why don't you use the USB port on your computer to get the audio out? USB to USB.
Message was edited by: BobTheFisherman

Need help for system audio output over airport

How can I set the system audio out over airport for all programs, not just iTunes
Thank you for help

You can do this using the low cost software add in called "Airfoil" - see:
http://www.rogueamoeba.com/airfoil/mac/

Mutli channel audio output via usb?

Hi there
I've had a browse through the support forums and can't find an answer to my question, so here it is:
I want to split the audio channels through the internal soundcard (I have an ibook g4) so that I can use audio mixing software.
Before I go out and buy some usb speakers, I was wondering if connecting speakers through the usb port would automatically do this - or, is there a way to assign an output route for each channel within the computer?
Any help is much appreciated.
Thanks

You'll need a "usb soundcard" that you can purchase from both apple store or just google it and I'm sure they have them all over the place (ebay, thinkgeek, ect). The built in soundcard is a 2 channel 44khz sound card with 1 output and 1 input via the built in microphone. Also, the only usb speakers I have ever seen are just usb powered, but they still plug in to the headphone plug.

Does Garageband for iPad support audio output over Airplay?

Since I don't currently have an Airplay output device on my network, I can't tell if Garageband supports this. Anyone know?
Thanks.

When the iPad or iTunes is sending music/video to an AirPlay Output device, it is actually sending the music/video file over to that device to play rather then just sending 2 channels of audio.
For this reason, GarageBand would be a difficult task asnit would need to send up to 10 files (8 tracks and 2 effects) over the network to play in perfect sync.
For this reason, garageBand would not be stable and you would have a large amount of drag.

[SOLVED] How to stream audio output over wifi?

Hello,
I have following problem. I would like to listen to the music from my laptop on my home Onkyo AV receiver (amplifier). Both laptop and receiver are connected on the same network, laptop via wifi, receiver using LAN. Receiver is capable to play internet radio streams in various format - e.g. ogg or mp3.
My idea is to produce ogg stream on laptop and listen to this stream through amplifier. I was searching for this solution a found something that has always some disadvantage, like MPD + MPC (can play only from database of local files, not from jamendo or other network services), DLNA can play only local files, Icecast + Ices can play from predefined playlist.
My idea is to have something independent - something what takes audio data normally played on soundcard and feeds it to network stream, something what can work with any player - audio or video, or even with desktop notifications.
Does anybody here know how to do it?
Thanks!
Last edited by KejPi (2012-03-14 20:18:28)

Thank all of you for your hints. Finally I have decided for ALSA based solution that simply works for all applications smoothly in background and it is here when I need it - in other words, it is something that doesn't borther me when I do not need it. I use ALSA loopback with ffmpeg and ffserver for streaming in mp3 format.This is my final solution:
You need following:
alsa
ffmpeg
if you use KDE4, then you need phonon-gstreamer backend, as in my case phonon-vlc didn't work (it was heavily distorted)
Procedure:
Modprobe snd-aloop (2 loopback channels are enough)
modprobe snd-aloop pcm_substreams=2
For permanent solution follow arch wiki https://wiki.archlinux.org/index.php/Modprobe
Create ALSA configuration file and store it either to ~/.asoundrc (just for user) or to /etc/asound.conf as system wide:
pcm.!default {
type asym
playback.pcm "LoopAndReal"
capture.pcm "hw:0,0"
hint {
show on
description "Default with loopback"
#"type plug" is mandatory to convert sample type
pcm.LoopAndReal {
type plug
slave.pcm mdev
route_policy "duplicate"
hint {
show on
description "LoopAndReal"
pcm.mdev {
type multi
slaves.a.pcm pcm.MixReal
slaves.a.channels 2
slaves.b.pcm pcm.MixLoopback
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
pcm.MixReal {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
#rate 48000
#rate 44100
#periods 128
#period_time 0
#period_size 1024 # must be power of 2
#buffer_size 8192
pcm.MixLoopback {
type dmix
ipc_key 1025
slave {
pcm "hw:Loopback,0,0"
#rate 48000
#rate 44100
#periods 128
#period_time 0
#period_size 1024 # must be power of 2
#buffer_size 8192
You can play with sample rates and buffer sizes you you have any problem. This configuration works on my system.
Prepare ffserver configration and store either to default location /etc/ffserver.conf as system wide setup or anywhere to your home:
# Port on which the server is listening. You must select a different
# port from your standard HTTP web server if it is running on the same
# computer.
Port 8090
# Address on which the server is bound. Only useful if you have
# several network interfaces.
BindAddress 0.0.0.0
# Number of simultaneous HTTP connections that can be handled. It has
# to be defined *before* the MaxClients parameter, since it defines the
# MaxClients maximum limit.
MaxHTTPConnections 2000
# Number of simultaneous requests that can be handled. Since FFServer
# is very fast, it is more likely that you will want to leave this high
# and use MaxBandwidth, below.
MaxClients 1000
# This the maximum amount of kbit/sec that you are prepared to
# consume when streaming to clients.
MaxBandwidth 1000
# Access log file (uses standard Apache log file format)
# '-' is the standard output.
CustomLog -
# Suppress that if you want to launch ffserver as a daemon.
NoDaemon
# Definition of the live feeds. Each live feed contains one video
# and/or audio sequence coming from an ffmpeg encoder or another
# ffserver. This sequence may be encoded simultaneously with several
# codecs at several resolutions.
<Feed feed1.ffm>
# You must use 'ffmpeg' to send a live feed to ffserver. In this
# example, you can type:
# ffmpeg http://localhost:8090/feed1.ffm
# ffserver can also do time shifting. It means that it can stream any
# previously recorded live stream. The request should contain:
# "http://xxxx?date=[YYYY-MM-DDT][[HH:]MM:]SS[.m...]".You must specify
# a path where the feed is stored on disk. You also specify the
# maximum size of the feed, where zero means unlimited. Default:
# File=/tmp/feed_name.ffm FileMaxSize=5M
File /tmp/feed1.ffm
FileMaxSize 200K
# You could specify
# ReadOnlyFile /saved/specialvideo.ffm
# This marks the file as readonly and it will not be deleted or updated.
# Specify launch in order to start ffmpeg automatically.
# First ffmpeg must be defined with an appropriate path if needed,
# after that options can follow, but avoid adding the http:// field
#Launch ffmpeg
# Only allow connections from localhost to the feed.
#ACL allow 127.0.0.1
</Feed>
# Now you can define each stream which will be generated from the
# original audio and video stream. Each format has a filename (here
# 'test1.mpg'). FFServer will send this stream when answering a
# request containing this filename.
# MP3 audio
<Stream stream.mp3>
Feed feed1.ffm
Format mp2
AudioCodec libmp3lame
AudioBitRate 320
AudioChannels 2
AudioSampleRate 44100
NoVideo
</Stream>
# Ogg Vorbis audio
#<Stream test.ogg>
#Feed feed1.ffm
#Format ogg
#AudioCodec libvorbis
#Title "Stream title"
#AudioBitRate 64
#AudioChannels 2
#AudioSampleRate 44100
#NoVideo
#</Stream>
# Special streams
# Server status
<Stream stat.html>
Format status
# Only allow local people to get the status
ACL allow localhost
ACL allow 192.168.1.0 192.168.1.255
#FaviconURL http://pond1.gladstonefamily.net:8080/favicon.ico
</Stream>
# Redirect index.html to the appropriate site
<Redirect index.html>
URL http://www.ffmpeg.org/
</Redirect>
This sets ffserver for streaming in MP3 format, stereo, 320kbps. Unfortunately I haven't succeeded with OGG Vorbis streaming.
Now you have all configuration you need and if you want to stream following two commands do that:
ffserver -f ffserver.conf
ffmpeg -f alsa -ac 2 -i hw:Loopback,1,0 http://localhost:8090/feed1.ffm
You can test it for example by mplayer:
mplayer http://YourLinuxBox:8090/stream.mp3
And that's it. Sound is played by normal sound card and sent to stream simultaneously. If you do not want to listen sound from computer you can mute your soundcard. It has an advantage that one can normally listen to music on the computer with or without streaming and in both cases without any reconfiguration. To start streaming just call ffserver and ffmpeg.
Advantages:
+ very simple solution without any special sound server
+ no special SW required (in my case I had already instaled all I need for that)
+ streaming on request by two simple commands
+ normal soundcard function
+ streaming in MP3 format that is supported by many home AV receivers
Disadvantages
- phonon-vlc backend not compatible (also VLC does not work)
- OGG streaming does not work
- some latency (~ 5 sec)
- all sounds are sent to stream, including various desktop notifications (in KDE could be managed by phonon)

G62-a50sf : (only) audio out over HDMI?

We have a G62-a50sf notebook at my gf's place that we'd like to use as the source for a (somewhat) audiophile audio set-up. One possibility to get better-than-headphone-output into a good receiver AND avoid using a separate DAC would be to feed the digital audio output over HDMI to the receiver.
The question I'm hoping to get an answer to is: will this be possible while retaining video output on the laptop's own screen?
thanks in advance,
René

Sorry, but your Mac doesn't send sound over HDMI, only mid-2010 and later MBP's send sound (and even then some require different adapters). Yours is a 2009 MBP, so only video will go over the HDMI cable. You will need to run audio from the audio out to your TV or digital audio out from your optical audio out to your receiver.

Multiple audio-outs via USB or Firewire?

I'm looking for a hardware solution for my mid-2010 MBP w/ 2-4 audio outputs via USB or Firewire. On the software side, I want to have multiple media players open and playing simultaniously, but each output separately. I was told m-audio makes devices that allow this, but I am curious which may be the cheapest with this capability - or alternate manufacturers.

I think you'd have better luck going to the m-audio forums and asking your question.
http://forums.m-audio.com/
It would be hit or miss to find someone here who's an expert on your issue. Also, you might post your question to the Logic Studio forum here:
https://discussions.apple.com/community/professional_applications/logic_studio
There are a lot of sound people there who might point you in the right direction with a MacBook Pro.

IMac12,2 osx 10.6.8. wont recognize external audio output

iMac12,2 osx 10.6.8. wont recognize external audio output via USB. The device, focusrite scarlet 2i2, works fine on my laptop not drivers are required and should work on 10.6.5. or greater. Any help would be very much appreciated.

iMac12,2 osx 10.6.8. wont recognize external audio output via USB. The device, focusrite scarlet 2i2, works fine on my laptop not drivers are required and should work on 10.6.5. or greater. Any help would be very much appreciated.

Audio out via USB

Mac mini audio out port was working on and off. No cause found. So thinking of other alternatives for audio out.
Is it possible to get audio output via USB such that I can connect it to my Hi-Fi?

Yes.
http://www.griffintechnology.com/products/imic/

Does Logic support Audio Interface and MIDI simultaneously over USB?

Hi -
I'm new to this so please bear with me :-). I have a MacBook running Logic. Also have a MIDI controller hooked up via USB.
I also have a USB Mixer that I'd like to hookup to the Mac's audio output. Currently, I have the MacBook's headphone output going into the mixer. I'd love to get the cleaner sound afforded by the USB connection. Is this possible while keeping the MIDI connection over USB?

Thanks, Fox. You're right - I just tried it out and it worked out very well (although I'm getting I high-pitched noise through my monitor speakers only when Logic is running. The noise stops when I exit out of Logic.)
I couldn't get myself to believe that the Mac/Logic could keep the USB data straight - MIDI on one, and audio on the other, but sure enough, it works just fine. :-)
Thanks!

Audio Output Corruption when using USB MIDI keyboard controller

recently, i'm getting intermittent corrupted audio output (short blips of distortion) while playing through my usb midi keyboard. i thought maybe some data got corrupted on the disk over time so i wiped the drive, reinstalled osx, installed all updates, hooked up usb keyboard and all worked fine. today, i plugged in the keyboard and the distortions have reappeared. i unplugged the keyboard and played with the Musical Typing- still distorted. i rebooted and tried Musical Typing- still distorted. I removed the usb midi keyboard device from Audio MIDI Setup, rebooted, and the distortions have disappeared when using Musical Typing. Connecting the keyboard causes the distortions to reappear. I'm at a loss.
Any ideas?
environment:
macbook pro
osx 10.4.11
gb 4.1.2
studiologic vmk188 plus

UPDATE:
I decided to try going through an Firewire Audio Interface instead. Keyboard-(MIDI)->MOTU Traveler-(Firewire)->MacBook Pro.
Same corruption/hiccups/choppy playback.

24 bit audio output over USB

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