AAC 5.1 surround sound on AppleTV

Hi there,
I recently became a user of FCPX and I do my videos now with 5.1 surround sound. Exporting the video from FCPX will result in a mov file having typically H264 HD video and AAC 5.1 as audio. So far so good, but when streaming on my AppleTV 2 I noticed that AppleTV 'decodes' the AAC audio to provide a downmixed stereo PCM audio on the optical interface and does not transcode the stream to DTS or AC3. Neither does it provide 6 discrete audio channel on the HDMI interface to allow to connect to a hometheater amplifier for true multichannel decoding.
My question: does AppleTV 3 support multichannel AAC and transcode to multichannel DTS or AC3 (via the optical audio interface) or alternatively does it support the decoding to 6 discrete PCM channels via HDMI ?
If not, is a firmware upgrade in the pipeline to support multichannel AAC ?
Many thanks for the info
Regards
Steve

AppleTV has never officially supported 5.1 AAC only Dolby Digital 5.1.
The majority of amps/receivers do not support AAC, and AppleTV AFAIK has never transcoded on the fly to 5.1 Dolby Digital.
Stereo audio AAC/WAV/Apple Lossless etc get converted by ATV2 and 3 to stereo linear PCM for optical output at 48 kHz (yes not 44.1 kHz even for CD) 16 bit.
Dolby Digital 5.1 is output as is, as a bitstream for decoding by an amp/receiver.
Not sure what AppleTV is doing with your 6 channel AAC - it may simply be using the L and R channels and discarding the rest or downmixing to 2 channel.
There is no official word on this.
The only officially supported specs we know of are:
ATV3:
http://www.apple.com/appletv/specs.html
ATV2:
http://support.apple.com/kb/SP598?viewlocale=en_US&locale=en_US
AC

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Thanks for your reply Dave.
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B Summers wrote:
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Thanks for your reply Dave.
I had suspected that this was the case. I've been exprimenting with iTunes and haven't even been able to receive a stereo AAC stream. AAC and AAC+ only seem to be supported for files and not internet streams.
If anyone disagrees, please feel free to correct me.
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Hi all
I thought I would write up a really quick but effecti've and simple guide for owners of the Audigy2 ZS and seeing how its Xmas time, I can assume a few lucky boys and girls may have this awesome card under the tree.
Most of whats covered should work with all creative products.
(Sorry, but I WILL NOT cover any info regarding encoding media or the like that will conflict with copyright laws)
This guide is for setting up your Creative Audigy 2 ZS for surround sound 5. reproduction and information in regards to required Filters/Codecs. I have not included any advanced set up options or the like as the ZS with the set ups I have incluced here will cover it out of the box.
One of the most common issues people may have with 5. not fuctioning correctly while playing a DVD movie ( Mpeg ) or any multi channel media that is 5. encoded, has to do with Codecs/Filters.
Most media players will not decode all AC3filters/Mpeg, thus require extra filters/codecs/plugins to be installed.
Ok , the first thing to do is ensure your sound card and speakers are set up correctly.
Most common speaker sets have 3 plugs that go in the back of your card .
EG, Logitech X-530. Pink = Front Centre.Black = Rear left and right. Green = Front left and right.
Ensure they are in the correct place and are tightly fitted.Ensure your sound card is secure and tightly in place.Make sure your speaker cables are tidy and not a big tangled mess.
Ensure in device audio controls that SPDIF passthrough is NOT ticked as this is for optical output ( the ZS pro with rack fuction )
Update to the latest drivers an media source ap
ps.
A few little things to set up first in Creative Mixer Control Panel to ensure cleaner sound:
Lower Master and Wav volume in Creative mixer to about 90% as to avoid any over dri've disstortion.Lower Master Bass Volume to about 90% to avoid over powering the bass.Ensure that your speaker settings Windows control panel and Creative speaker settings match your speaker set up..
Also run the THX Speaker Callibration test in basic mode.
YOU SHOULD DISSABLE CMSS IN EAX CP IN ORDER TO GET 5. TO FUCTION AS IT SHOULD.
CMSS is to be use only for a MONO or STEREO source/signal. It is for sending the stereo/mono signal ( left and right) to all speakers. This is not 5., mearly it is the same signal sent to all speakers to give you a more rich and vivid sound reproduction of an other wise flat source.
Turn off any EAX FX.
Things you want to do to ensure stable use:
SHUT DOWN CTHELPER:
A background task that is a plug-in manager for Creative drivers. A 3rd party manufacturer can use the CTHELPER plug-in interface to produce drivers, add-on features, and fixes that will integrate with a tighter fit with Creative?s sound drivers and utilities. Gi'ven its purpose CTHELPER would normally be classified as a "leave alone" background task. It also allows Creative speaker setup to be synchronized with Windows Control Panel speaker setting. Without it running that check box in Creative speaker setting is not functional (settings are not in sync). Unfortunately there are often problems with CTHELPER, most notably that it can use 00% of CPU time so it's best left disabled unless you REALLY need it .
Type in run "msconfig" and shut down all Creative Start up entries. Infact its proberly best to shut everything down.
NOTE: Any essentinal Software for the proper fuction of devices ,Eg: Razer mouse utils should be left on.
Simple Bios settings to help improve audio and stablity:
Dissable Pallette Snoop.ANY AND ALL shadows for devices, EG VGA BIOS and system bios should be dissabled. If you have the setting for PCI latency in your bios ( AGP boards only ) set it to 64, if its already at 64 try 32 .
Shut down ( remove, reconmended ) any 3rd party tweak apps that run in the background.
EG, Cache Man and any monitoring software.
Ok, now for Filters/Codecs and Plugins.
A major required Filter is AC3. (ac3filter__0a_rc5)
AC3Filter - it is DirectShow filter for AC3 decoding to play AVI with AC3 audio tracks and MPEG2 (DVD). Required for WMP.
NOTE: If you have DVD software that should play encoded 5. then make sure you have any updates/patches for the player installed and go through the tools/options for the player and ensure its setup correctly to decode AC3filters in the applictions tools menu.
If you use Cyberlink Power DVD you may need to pay an extra fee to get the required AC3filter/MPEG2 decoders to fuction as all 5. sound settings may be greyed out on some dated versions.
InterVideo WIN DVD ( this software suit comes with most "Asus" if not all makes of Mainboards. This suit comes complete with the required codecs/filters so get full surrport for 5. - 6. - 7. out of the box. Note: you must set it up first under audio options as it defualts to 2..
If you use WMP0 you should download and install the AC3filter or get the latest XP codec/filters packs. With out these filters you may not get 5. sound and/or poor reproduction.
Supported file types:
The following table lists the file types (formats) supported by Windows Media Player .(For files type played by Power DVD or WIN DVD please refer to the makers website or read me file for a detailed list).
File type (format) File name extension .
Music CD Playback (CD audio) .cda Audio Interchange File Format (AIFF) .aif, .aifc, and .aiff Windows Media audio and video files .asf, .asx, .wax, .wm, .wma, .wmd, .wmp, .wmv, .wmx, .wpl, and .wvx Windows audio and video files .avi and .wav Windows Media Player skins .wmz Moving Picture Experts Group (MPEG) .mpeg, .mpg, .mv, .mp2, .mpa, .mpe, .mp2v*, and .mpv2 Musical Instrument Digital Interface (MIDI) .mid, .midi, and .rmi AU (UNIX) .au and .snd MP3 .mp3 and .m3u DVD video .vob Macromedia Flash .swf Microsoft Recorded TV Show .dvr-ms*
NOTE: WMP defualts to 2.. To enable 5. run WMP0. Click on tools then point to options. Navigate to DVD then open up the advanced window. In here is everything you need to set things up.
NOTE: If you mess things up simply return to defult settings and start over.
Some common errors you may encounter with WMP.
Error messages are identified by numerical IDs, such as C00D0BC2 and 800704CF. You can determine the ID of a specific error message by clicking the More Information or Web Help button on the error message when you encounter it. The resulting page will indicate the error ID.
: Error's C00D6A and C00D9A while playing DVD's or MPEG-2 content.
This is directly related to either your current video card drivers or the MPEG-2/DVD decoder you have installed (EG: PowerDVD, Win DVD etc ). Reinstalling and/or uninstalling the MPEG-2/DVD decoder (PowerDVD, Win DVD ) and/or video drivers should fix the problem for you.
You should now be able to re-install you decoder ( Power DVD etc ) and continue its use.
Erro : C00DAC:
Cannot play the file Windows Media Player cannot play the protected file because there is a problem with your sound device, such as a sound card or sound controller. You might encounter this error message for one of the following reasons.
Your sound device requires an updated driver. ( update driver )
The selected sound device does not support Secure Audio Path (SAP).
If you have multiple sound devices installed on your computer, try using a different one.
To use a different sound device, on the Tools menu, click Options, and then click the Devices tab. Double-click Speakers, audio device to use, click a different device.
Error : "divide error in module IVIAUDIO.AX at".
Only exists in systems that have various Sound Blaster Li've sound cards and WinDVD installed.
This is infact a compatibility problem between these products. The problem is realized when MP3 oriented applications call upon certain sound card services making it look as though the error was raised from within the application in question.
FIX:Uninstall WIN DVD. Reinstall WMP and AC3 filter and then reinstall DVD WIN.
A simple but rare issue.
ModName.Win DVD "msvcrt.dll" and/or Win DVD MFC application error.
FIX:
Uninstall any java filters. Macromedia and Macromedia Acti'veX.
( to remove Acti'veX go to C:\WINDOWS\Downloaded Program Files and delete the Acti'veX )
What are codecs Codecs/Filters.
Codec stands for Coder/Decoder. Basically it is a piece of software or a driver that adds a support for certain video/audio format for your operating system. With codec, your system recognizes the format the codec is built for and allows you to play the audio/video file (=decode) or in some cases, to change another audio/video file into that format (=(en)code).
For example, when you install Windows to your home computer, Windows installs automatically most commonly used codecs into the system, so you don't have to download them separately from their vendors. However there are some codecs that are widely used, but not installed by Windows. Most notably DivX , MPEG-2.
Get all the Codecs/Filters/Plugins you could ever need from:
http://www.free-codecs.com/AC3_Filter_download.htm (ac3filter__0a_rc5)
http://www.free-codecs.com/
NOTE: ( XviD-.0.3-2022004 for Divx ) Stand alone codec for playing Divx instead of the Divx full install.
http://www.microsoft.com/windows/win...0/default.aspx
Ok, you now should be all set.
However Codecs/Filters/Plugins are like any other kind of software installed and things can go wrong. If things are not working as they should try the following.
Download and install "Gspot"
http://gspot.headbands.com/download.htmlBuild 0307 - 23 KB Run the programme and simply point to system and select "List Codecs and other Filters"
Its a no brainer really to know whats what here and how to use it to find out the source of the issue, if you have one. If its red, its bad so you then need to trace the Filter/Codec to its source and remove it.
Here is just one very simple excample you may encounter and how it was fixed.
If you have ffdshow file is missing error pop up while running a player application, first go to C:\WINDOWS\system32 and search for ffdshow.en. Its proberly not here though. If it is just leave it be.
NOTE: ffdshow is used for AVI/Xvid enc/dec source.
To fix this "ffdshow Video Codec file is missing " error Simply uninstall your Xvid codec or your entire DivX programme, or any other Filter/Codec you have installed for playback of DivX files and AVI Video Files.
(Some times it seems a few Codecs/Filters dont get along so you must be aware of what you install).
Cheak "Gspot" again and Filter should be removed from the list.
Now you can reinstall the Xvid filter "XviD-.0.3-2022004" or your desired DivX programme.
Now go back toC:\WINDOWS\system32 and search for ffdshow.en. It should be there if it was not before. If the issue is back try a different version of required Filter.
So, thats just excample of a simple fix that got everything working again. Its not to hard to find out what the problem Codec/Filter is and then its just a case of uninstalling it. You can re-install the Codec/Filter but you should double cheak with "Gspot" and ensure the issue has not repeated itself .
If it has you can try and find out if the issue is related to another type filter causing a conflict or use an alternate Filter/Codec that will perform the same task .
Search for an updated version of required the Codec/Filter also.
Ok, thats pretty much the basics in getting correct and stable 5. sound working the way it should with your new Creative Audigy 2 ZS sound card.
I hope this has been of help.
Regards,xmn.
Message Edited by xmn on 2-24-2005 08:02 PM
Message Edited by xmn on 2-24-2005 08:04 PM
Message Edited by xmn on 2-24-2005 08:05 PM
Message Edited by xmn on 2-24-2005 08:05 PM
Message Edited by xmn on 2-24-2005 08:09 PM
Message Edited by xmn on 2-24-2005 09:29 PM
Message Edited by xmn on 2-26-2005 03:07 PM

BUMP, just incase its been missed by a new board member

How do I connect my Apple TV to my Philips surround sound DVD system?

I can't seem to get surround sound when watching Apple TV (or when watching live or recorded TV via my Virgin Tivo). I use a three-years old Philips DVD home surround system to get surround sound when I'm watching Blu-Ray (I have connected my Philips Blu-ray and my Philips DVD player without difficulty). But I can't figure out how to get surround sound whne watching Apple TV. I bought an optical cable with an audio jack on one end, to connect to the DVD player and the optical end clicks into the ATV. Still nothing. Any ideas?

The surround system seems to support digital audio - it has settings for HDMI audio and video (even though it doesn't actually have an HDMI port) I bought the optical/audio cable on the advice of a staff member in the Apple Store, but frankly, she didn't see, to understand my problem. She recommended I insert the cable into the "MP3 cable IN" port but that' not working.
I'm probably not explaining myself very well - bottom line: I have a DVD surround system and an Apple TV, so how do I connect them?

AAC 5.1 surround sound on AppleTV

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