Streaming iTunes video across network

Hello!
I ripped one of my DVDs to my hard drive and converted it to a Quicktime movie using the H264 codec. Now i would like to stream the video using Airport and Front Row. When I try to access the video in Front Row, there is an error message saying it can't play the video. Am I missing something? The video can be played in iTunes, but not on the other computer.
Thanks for your help!

More tests have revealed:
(1) Sharing videos from my second mac, a MacBook Pro, to the iPad Videos app works fine.
(2) When i switched to a small, test iTunes Library on the iMac and tried Sharing with the iPad app, that worked fine, too.
(3) However, using my main iTunes Library on the iMac still gives me a problem when trying to share videos to the iPad app. That problem persisted even though I removed all videos that didn't come from the iTunes Store from that main library. I tried downloading all my iTunes store movies and TV shows to the iMac, but that didn't help. Nor did reverting all those videos back to the iCloud, such that non of iTunes's videos were seen as physically present on the iMac.
I am now in the midst of re-creating my main iTunes Library file, using the "iTunes: How to re-create your iTunes library and playlists" procedure found at http://support.apple.com/kb/ht1451. More later ...

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Can we use the air port time capsule to stream iTunes videos through an iPad?

Can we use the air port time capsule to stream iTunes videos through an iPad?

dean earl wrote:
Can we use the air port time capsule to stream iTunes videos through an iPad?
On what device do those iTunes videos reside?

Possible Bug in iOS 8 via Streaming iTunes Video results in lost storage space?

Hi looking for suggestions or help on this issue if you can.
I'm not sure if the issue is my attempting to stream a movie from iTunes under iOS 8 or if it is a result of the iOS 8 update (size) itself or some type of memory leak or inability of memory to be released back to the OS.
This AM I had ~4.8GB of free space on my 16GB iPhone 5C; running under iOS 7. I then updated to iOS 8 by connecting the phone to my iMac and doing the install through iTunes under a USB wired connection. I however I did NOT check after the update how much space was "Available" after the update on the iPhone itself.
While streaming a long movie (LOTR extended) from the iCloud through the Apple Video app; now under iOS 8, I received a notification that my Storage space was nearly used up. While looking in Settings\Usage\Storage I can see that I had roughly 250MB of space "Available" but only 12.7GB was "USED." Here is were things get strange. Looking into the "Manage Storage" section I added up all of the space "used" by the apps listed (Video app was NOT listed) and came up with a sum of 6GB of used space. Now why is that? The listed 12.7GB of used space is not equal to 6GB what is using up the remaining 6.7GB?
Now my research of the web suggests iOS 7 was ~3.5GB in size and my best GUESS at iOS 8 is that it is a16GB - 12.7GB = 3.3GB; although I thought iOS 8 was going to use up more space? For the sake of argument lets say iOS 8 is 5.8GB and my calculated Used Space it 6GB, that equals 11.8GB. Where are the remaining 4.2GB?
Keep in mind I added No new apps (albeit a few updates to FindMyFrieds, Remote, Pages, AirPort Utility, FindMyiPhone all to be iOS 8 compatable). I also force quit the VIDEO app thinking that the video that was streaming was taking up local storage while it was playing. Is it possible that the memory was used up by the stream and is not being Released; hence it seems I have no available space?
Powering the phone down and re-starting it did not seem to do anything.
I still need to go home, connect to iTunes and double check if the available space on the phone matches to what iTunes see.
Thanks and sorry for the long question, just wanted to get as many variables out there in case anyone else has had this issue.

searching.4.answers . . . sounds like you too were able to "inform" your device that the content is no longer needed, great. I posted a solution that later didn't work for me when I streamed another video (see my post dated Nov 1 - cjdmedia). I then had great success using what others in this forum have suggested . . . I downloaded the free ibrowse app (do a quick google search for this and you'll find the website for it). Sure enough it was a piece of cake to navigate to the iCloud assets folder and find and delete the video file. That is my solution from now on. Unfortunate that I need to do that to have my storage space clear.
Also in my post I shared that I thought this was a bug, unfortunately I now believe that this could be intended behavior. The only question is how long does this data just sit there until it is removed by the system? or is it removed by the system? If it is not removed by the system at some point then a strong argument could be made that this is a bug. Streaming means that data is not permenantly saved on the device, right?
My fundamental issue is that I have 16GB storage that really means I have a total of 12.8GB (so says my iPhone). With no personal photos or videos, only 300MB of music, some books etc, and all the apps I want installed on my iPhone I end up with only 9GB available for anything else. A typical movie in HD takes up half of that. Not aware that the data of movies was being stored on my phone while streaming I completely filled up my iPhone only days after completely wiping and setting up. When I got the notification that my phone was full when trying to take video of my kids Trick-or-Treating - I was infuriated that something was hogging the memory in my phone, perhaps I had upgraded to iOS 8 too early before known issues were eliminated. I thought I had 9GB of space for pictures and video! To be fair, Apple did not ruin Halloween because my wife had her iPhone. I also know that this "issue" has been around since iOS 7 (based on my searching) and I haven't seen any confirmation it has ever been dealt with. From another apple discussion forum stream itunes purchased movies to iPad I discovered that if your device is almost full you can still "stream" because somehow the system knows how much space you have and then behaves more like what you'd expect from streaming which is interesting.
So to wrap this long post . . . it is obvious that to stream there needs to be data stored locally, but it is unclear how much data and how long this data will stay on your device. The quickest solution (requires a computer) is to use the iBrowse app and manually delete the movie files in the iCloud assets folder.

Using an LG BD390 to Stream iTunes Video

Hi
I have 2 Apple TVs but am unhappy with the length of time it takes to sync, stuttered streaming, and signal drops.
I am buying an LG BD390 so I can stream NETFLIX and have other capabilities. Is it possible to sync this with my iTunes library and use this in place of the Apple TV? As another option can I put the iTunes Library on an external hard drive, connect to the LG and watch through it?
Thanks
Steppenwolf

I don't see any indication that the LG will directly connect to iTunes or an iTunes library. The LG only seems to work with DLNA sharing which iTunes does not support. But you might be able to get it working using the free Squeezebox Server software which does, I believe, support DLNA. This will only work with music (and that only those tracks without copy protection); videos, TV shows and movies acquired from the iTunes Store can only be played on an Apple device or Apple software.
As another option can I put the iTunes Library on an external hard drive, connect to the LG and watch through it?
From the documentation it looks like this would be possible, though you would only get the tracks themselves, not playlists, rating, etc. And again, this would only worth with non-protected music tracks, not with shows, videos or movies.

How to stream iTunes videos without storing them on AppleTV or iPod?

I have several iTunes high res videos (very large files) that I would like to stream to my AppleTV, but not store them on the AppleTV or iPod. How do I mark these videos in iTunes so this happens while still allowing other videos to be stored locally on the AppleTV and iPod? Another possibility is setting up AppleTV so its HD acts as a FIFO buffer for streamed video. As it is now, the AppleTV fills with stuff in my iTunes library until it's full. Yes, I know I can set priorities for movies, TV shows and podcasts, but this doesn't help. These HiRes files download as podcasts, but should be given priority, storage wise, over all other podcasts.
 20" Intel iMac + Cinema Display + Sony HDR-HC7 HD camera Mac OS X (10.4.8) All tools, no talent!

if i understand what you are asking in itunes go to the apple tv device and under movies elect not to sync all or any of the movie listed in itunes.
it's also possible in itunes to add movie from whatever location and choose to not import them into itunes, it you want to keep some on a different disk. dragging them in will cause them to show up, but they will remain in the orginal location.
good luck

Bug in iOS 8 via Streaming iTunes Video results in lost storage space

Hi,
i am from Germany and i am cant believe that i this Problem is a Problem what not all ios 8 Users has.
While streaming a Movie or TV Show from the iCloud through the Apple Video app; now under iOS 8, the "Other"-Memory Space go higher and higher. When i want delete the Movie Files like on iOS 7 before i go to the "Manage Storage" Option but there is no Videos Folder anymore. I cant delete the Files. On the Info Options in the Setting is see there is 1 Video on the iPad but i cant delete the Files.
I also force quit the VIDEO app or restart the Device - no changes. The Video Files are on the Storage. But i cant see them and delete them.
Today i talk with the Apple Support and reset the Device complete with a new iOS 8.1. Then i installed no Apps , only try to play a Video. Same Bug.
Powering the phone down and re-starting it did not seem to do anything.
Who has the same bug and what can i do ? Any Tipps here?
Thanks and sorry for the long question

It may not officially stream, but it does behave as follows:
No videos watched - available storage: 16GB
Video watched from cloud by clicking on title of video and not by clicking on iCloud download icon - available storage on device: 11GB
Open storage usage detail and content of video app is not showing.
Download the video watched in step 2 using the iCloud download icon - available storage still 11GB
Open storage usage detail in settings and now the video content in 5GB
Delete the video downloaded in step 4 and available device storage is back up to 16GB.
That may not be streaming, but it is a bug. The worst thing is that sometimes steps 4-6 don't work and so my "Other" storage just become cluttered with content and a complete wipe and setup as new device is required.
I have now seen the above so many times that I am in no doubt at all that this defect is real.
That is simply not acceptable.

Streaming video from networked drive to iTunes stutters!

So, my brand new iMac with the optional graphics card can't play movies bought from iTunes without stuttering a little. We store the movies on a recently bought ethernet-capable 250GB drive which communicates with the iMac through a new 100Mbps switch. iTunes plays these movies flicker-free from the local HD, but not over the network. Quicktime has the same issue. That networked drive is the "iTunes Music Folder Location" specified in preferences. This is iTunes 7.0.2. Music streams fine. I've set iTunes' preferences for "streaming buffer size" to "large."
We want to store the movies on the networked drive so we can easily add capacity and access them from other machines on the network. Sounds logical, right? Isn't that what these drives are for? Help! I want my Media Server!
We also watch TV on the iMac, using an Elgato eyeTV 250. It's fine, and caches 2GB of video during playback. When we tell it to write to the networked drive, it stutters a little too. Like one 'jag' every 10-20 seconds. When we use the local disk, it's seamless.
One thought: the iMac is cabeled to that switch with a 100-foot cable. A problem?

Hello there, Myrte.
The following Knowledge Base article covers the steps on importing content into your iTunes library:
iTunes 11 for Windows: Import music and video already on your computer
http://support.apple.com/kb/PH12493
Additionally this article provides information on iTunes compatible video formats:
iTunes: Frequently asked questions about viewing and syncing videos
http://support.apple.com/kb/ht2729
What video content works with iTunes and mobile devices?
iTunes:
Video content purchased from the iTunes Store.
QuickTime and MPEG-4 movie files that end in ".mov", ".m4v", or ".mp4" and are playable in QuickTime Player.
Video podcasts.
iTunes Digital Copies.
iTunes Store Movie Rentals (Requires iTunes 9 or later).
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

Apple TV Gen 2.. Terribly Slow Streaming From Wired Home Network via itunes Windows 7. Please Help

Hello all, I just signed up for this as i hope to get more results from here than i did waiting 4 hours for a call from apple today.
I recently purchased an Apple TV Gen 2.. installed it on my Samsung 40" HDTV via HDMI cable and also ran a network cable to my basement where my router, (Linksys 5 port router plus Wireless) is mounted on the wall beside the cable modem.
just to rule things out i will give some spec's and details before i get further into this.
My goal is to use my Desktop Homebuilt PC running windows 7 ultimate 64bit to store my Digital Movie Library and stream through itunes all of my digital media to my Apple TV located in another room. Both Apple TV and my desktop windows 7 PC are hard wired NOT WIRELESS.
My internet connection is cable and tested it this evening several times at 58.9 Megabits per second down and 8 Megabits per second down... (yes that is correct 58mb/s down. this equates to about 7.1 megabytes per second download speeds for reference.
Now just to rule out my 2 year old wireless router i went and purchased a brand new router today... Same results.
Now on to the problem details and my findings.
Using my Desktop PC wired to try and stream Itunes movies from the streaming is absurdly slow.. very slow... i have yet to wait to see what happens after 30 minutes of waiting for a Movie to start.. music also takes a long time to load...
Music... i can go to icloud funtion which i paid for today.. and click on the same song in icloud and the song starts almost instantly, so does music videos...
Also previously purchased TV shows starts playing from the cloud almost instantly as well even HD TV shows...
Trying to stream anything through my desktop windows 7 pc just doesnt work right...
I have narrowed this problem down to my desktop.. but can not figure out what the problem is...
using my macbook air 120GB SSD wireless over the same network, which i also have a mirrored copy of my itunes library for testing purposes... there is zero issues with streaming anything from my macbook air over the same network via wifi...
Also using my ipad 2 mirroring works flawlessly, even HD movies plays without a hitch... same goes for my iphone 4s
the only issues i am having are with my desktop and streaming from my itunes libary on it... i do not want to use my macbook air.. as that defeats the purpose of having apple TV.. in the future i plan on ripping my entire DVD / Blueray collection to a 3 TB hard drive and stream to my AppleTV... from my desktop computer storing my entire DVD / Blue Ray library digitally on the 3TB hard drive....
But i can not get this to work... i can see my itunes libary on my desktop.. i can play music and watch movies.. other than anything HD will not play... but everything takes a rediculously long time to load... i can download an entire movie with my 58mb's connection in the time it takes to load something streaming from my itunes libary on my desktop PC...
if anyone has any suggestions.. there may be something i have overlooked or i am missing. any input and or advice will be greatly appriciated.
Thanks,
Specs on my Desktop system: itunes Streaming media PC
Windows 7 Ultimate 64bit Fresh install as of yesterday.
Intel Core i7 2700k @ 4.8Ghz
ASRock Pro 1155 motherboard intel Z68
OCZ Vertex III 120GB SSD x2 Raid 0   (OS Drive)   1,000Mb/s reads , 990 writes
Western Digital Caviar Black 640GB 7200 Rpm (itunes media folder drive, backup drive)
GTX 470x2 SLI
Gskill Z Series DDR3 2133mhz @ 1.65v cas 9, 16GB
1200watt cooler master PSU
LG 22" 1920x1080 LED x3   Nvidia Surround   (6018x1080)

Ok.. in order to help other users i will post this..
I have resolved the issue... it was rather simple and dumb...
I never use windows media player ever.. i do not like it and can not stand it.. because in my case it was a brand new windows installation this fix will only apply to certain users..
because it was a brand new windows installation.. i had never clicked on windows media player.. apparently streaming settings are embedded into windows media player for the windows 7 OS...    in past installations that i have used for years.. i simply never ever clicked on windows media player, as i never had a reason to.. i use itunes for my ipad, iphone etc.. etc...
by accident and shear luck i decided to click on windows media player.. and of course go through the express settings.... after i did this all of my streaming problems to my apple tv gen2 disapeared... HD movies now start almost instantly... so as i stated above apparently there are media streaming settings embedded into the OS through windows media player... doesnt make any sense to me as i never use the program.. but whatever that fixed my issue..
so for any of you windows 7 people out there using a windows 7 pc as your itunes sync computer and using that itunes library to stream to your apple tv... make sure you have done the initial setup at min.. of windows media player.. i still left itunes as my default player.... everything now works flawlessly... infact for whatever reason.. even in an HD movie my network almost has half the movie synced now accross the bar before the movie starts so now my apple tv is blazing fast....
i have been struggling with this for 2 days now and simply never gave it a thought that windows media player would ever have anything to do with itunes streaming a totally seperate program.. but it did..
i hope this helps other people with similar problems.
good luck

Sharing an iTunes Library across multiple user account and a network.

Sharing an iTunes Music Library across multiple user accounts.
Hello Everybody!
Firstly, this was designed to be run in Mac OS X 10.4 Tiger. It will not work with earlier versions of Mac OS X! Sorry.
Here's a handy tip for keeping your hard drive neat and tidy, it also saves space, what in effect will be done is an iTunes music library will be shared amongst multiple users on the same machine. There are advantages and disadvantages to using this method.
• Firstly I think it might be worthwhile to state the advantages and disadvantages to using this approach.
The advantages include:
- Space will be saved, as no duplicate files will occur.
- The administrator will be able to have complete control over the content of the iTunes library, this may be useful for restricting the content of the Library; particularly for example if computer is being used at and education institution, business or any other sort of institution where things such as explicit content would be less favorable.
- The machine will not be slowed by the fact that every user has lots of files.
The disadvantages to this system include.
- The fact that the account storing the music will have to be logged in, and iTunes will have to be active in that account.
- If the account housing the music is not active then nobody can use the iTunes library.
- There is a certain degree of risk present when an administrator account must be continually active.
- Fast User Switching must be enabled.
Overview:
A central account controls all music on the machine/network, this is achieved by storing iTunes files in a public location as opposed to in the user's directory. In effect the system will give all users across the machine/network access to the same music/files without the possibility of files 'doubling up' because two different users like the same types of music. This approach saves valuable disk space in this regard and may therefore prove to be useful in some situations.
This is a hearty process to undertake, so only follow this tutorial if you're willing to go all the way to the end of it.
Process:
Step 1:
Firstly, we need to organize the host library, I tidied mine up, removing excess playlists, random files, things like that. this will make thing a bit easier in the later stages of this process.
Once the library is tidied up, move the entire "iTunes" folder from your Home directory to the "//localhost" directory (The Macintosh HD) and ensure that files are on the same level as the "Applications", "Users", "Library" and "System" directories; this will ensure that the files in the library are available to all users on the machine (this also works for networks)
Optionally you can set the ownership of the folder to the 'administrator' account (the user who will be hosting the library.), you may also like to set the permissions of 'you can' to "Read & Write" (assuming that you are doing this through the user who will host the library); secondly you should set the "Owner" to the administrator who will be hosting the library and set their "access" to "Read & Write" (this will ensure that the administrator has full access to the folder). The final part of this step involves setting access for the "Others" tab to "Read Only" this will ensure that the other users can view but not modify the contents on the folder.
Overview:
So far we have done the following steps:
1. Organized the host library.
2. Placed the iTunes directory into a 'public' directory so that other users may use it. (this step is essential if you plan on sharing the library across multiple accounts on the same machine. NOTE: this step is only necessary if you are wanting to share you library across multiple accounts on the same machine, if you simply want to share the music across a network, use the iTunes sharing facility.
3. set ownership and permissions for the iTunes music folder.
Step 2:
Currently the administrator is the only user who can use this library, however we will address this soon. In this step we will enable iTunes music sharing in the administrator's account, this will enable other users to access the files in the library.
If you are not logged in as the administrator, do so; secondly, open iTunes and select "Preferences" from the "iTunes" menu, now click the "Sharing" tab, if "share my library on my local network" is not checked, the radio buttons below this will now become active, you may choose to share the entire libraries contents, or share only selected content.
Sharing only selected content may be useful if their is explicit content in the library and minors use the network or machine that the library is connected to.
If you have selected "share entire library" go to Step 3, if you have selected share "share selected playlists" read on.
After clicking "share selected playlists" you must then select the playlists that you intend to share across your accounts and network. Once you have finished selecting the playlists, click "OK" to save the settings.
Overview:
In this step we:
1. Enabled iTunes sharing in the administrator's account, now, users on the local network may access the iTunes library, however, users on the same machine may not.
Step 3:
Now we will enable users on the same machine to access the library on the machine. This is achieved by logging in as each user, opening iTunes, opening iTunes preferences, and clicking "look for shared music". now all users on the machine may also access the library that the administrator controls.
This in effect will mean that the user will not need to use their user library, it will be provided to them via a pseudo network connection.
As a secondary measure, I have chosen to write a generic login script that will move any content from the user's "Music/iTunes/iTunes Music" directory to the trash and then empties the user's trash.
This is done through the use of an Automator Application: this application does the following actions.
1. Uses the "Finder" action "Get Specified Finder Items"
1a. The user's "~/Music/iTunes/iTunes Music" folder
2. Uses the "Finder" action "Get Folder Contents"
3. Uses the "Finder" action "Move to Trash"
4. Uses the "Automator" action "Run AppleScript"
4a. with the following:
on run {input, parameters}
tell application "Finder"
empty trash
end tell
return input
end run
IMPORTANT: Once the script is adapted to the user account it must be set as a login item. in order to keep the script out of the way i have placed it in the user's "Library" directory, in "Application Support" under "iTunes".
Overview:
Here we:
1. Enabled iTunes sharing in the user accounts on the host machine, in effect allowing all users of the machine to view a single iTunes library.
2. (Optional) I have created a login application that will remove any content that has been added to user iTunes libraries, this in effect stops other users of the machine from adding music and files to iTunes.
Step 4:
If it is not already enabled, open system preferences and enable Fast User Switching in Accounts Options.
Summary:
We have shared a single iTunes library across multiple user account, while still allowing for network sharing. This method is designed to save space on machines, particularly those with smaller hard drives.
I hope that this hint proves to be helpful and I hope everybody will give me feedback on my process.
regards,
Pete.
iBook G4; 60GB Hard Drive, 512MB RAM, Airport Extreme Mac OS X (10.4.6) iWork & iLife '06, Adobe CS2, Final Cut Pro. Anything and Everything!!!

how to share music between different accounts on a single computer

I subscribe to Acorn TV. I am unable to stream their videos. I have no problem with Hulu, iTunes, Netflix. I have spoken with Acorn and have tried Firefox, Chrome and Safari, but nothing works. I am using a MacBook OS 10.6.8 and Firefox 3.6.12

I am a premium subscriber to AcornTV. I have been unable to stream video on my home MacBook Pro (OS 10.6.8) using Firefox 3.6.12. I can easily stream Hulu, iTunes, Netflix, etc, but NOT AcornTV. I have tried the AcornTV player on Safari, Chrome and Firefox, nothing works. I use Time Warner High Speed internet at home, and they claim the problem is on Acorn's end, which Acorn denies. The biggest frustration is that I CAN stream Acorn videos on my office iMac desktop, using the same OS and same version of Firefox (we have our own server at work, though).

I'm watching it right now on Firexfox, but it's on a Dell, not a Mac. Have you tired watching it on a Chrome or IE browser instead of Firefox? And does it work on those browsers?
You should continue to follow up with Acorn TV - email [email protected] and you will get help, from the CTO, if necessary. Also, they now have a diagnostic page built that can analyze your computer and it will give them more information about your system. So, if you haven't tried in two months, it might be worth trying again.

Can i stream an iTunes movie across my ipad and my wife's at same time?

can i stream an iTunes movie across my ipad and my wife's at same time?

Try it and let us know.
You won't rip a hole in the space time continuum or anything by trying.
My guess is you want some kind of simulcast thingy?

My ipad streaming purchased video from itunes stops every few seconds. does not happen with any other streaming video service.

my ipad streaming purchased video from itunes stops every few seconds. This does not happen with any other streaming video service. I have restarted and rebooted already.

I've tried both things, but video still stutters.. Have also tried removing profile, and complete reinstall of firefox.
I'm on 24 Mbit cable and the only user atm. IE and Chrome seems to work without stuttering.
I've having this stuttering every ~5th second, like a small "1/4 sec buffering".

Streaming Itunes U video requirements

Is there a minimum download speed for streaming itunes U video. I find that
the video starts and than hangs up after 2 seconds. I am using DSL with a download
speed of 768kbs.
I am using itunes 11

Did you create the course using iTunes U for iPad or Course Manager?

Streaming iTunes from Mac to Mac

First, a Happy New Year to you all!
I'm not sure if this is asked before, I couln't find a post. This is the thing: One of my favorite things to do on my Mac is to stream music from an iMac to my Airport Express with connected speakers. Now I wonder if it is also possible to stream my music to other Macs in my house, preferably without any additional software than iTunes.
Thanks in advance for your response.
Best regards,
Corné.

From the iTunes Help File:
"Sharing your iTunes library across computers
If your computer is connected to other computers over a local network, you can share items in your library and playlists with up to five of those computers (in the same subnet).
To share your library with other computers:
Choose iTunes > Preferences, click Sharing, and select “Share my library on my local network.”
Select the items you want to share.
To require users to enter a password before they can see your shared items, select “Require password” and enter a password.
For others to see your shared items, your computer must be on and iTunes must be open.
If you choose to share your entire library, its name appears in the iTunes window (below Shared) on other local computers (in the same subnet) set up to look for shared libraries. To change the name others see, choose iTunes > Preferences, click General, and type a new name in the Library Name field.
You can share movies; MP3, Apple Lossless, AIFF, WAV, and AAC files; and radio station links; you can’t share programs purchased from Audible.com or QuickTime sound files.
Sharing is intended for personal use only."
Hope this works for you. I thought you were supposed to be making Oliebollen today, not playing with computers.

Can Apple Remote Desktop route audio to selected computers across network?

Can ARD be used to route audio output (e.g. from iTunes) across the network? If not, suggestions would be appreciated.
I remember that there was a -display option on Unix commands that let us run applications remotely and wondered if that might be a start to getting this task to work.
The intention is to feed audio-streamed data out to networked iMacs for use during classroom tests, controlled from a central admin computer in a different room. None of the classroom iMacs in question have iTunes on them, since it was removed to keep the machines more focused on classroom activities.

Sorry but no, ARD does not support audio across the network in any form.
Airfoil supports streaming of audio to other computers. I don't know if it will stream to multiple computers simultaneously, but you could check.
Regards.

Streaming iTunes video across network

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