[AppleTV2] HOW-TO to enable AC3 and DTS output for Apple TV 2

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dazex Offline
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Post: #41
davilla Wrote:Make sure that you indicate which atv2 os this works on or does not. Just so everyone uses the same notation.

4.1
4.2
4.2.1
4.3bx

those are the versions, what shows in atv2 GUI is something else.

When checking what firmware or IOS version you are running from the aTV2. Pressing the center button will toggle between firmware -> IOS ->something else, I forget.

-Dazex
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wurz Offline
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Post: #42
OS Build 4.2.1
Software version 4.1.1
Changed both lines in guisettings.xml
Audio output HDMI
Speakers set to 5.1
HDMI cable connected to Sony amp


Works fine!
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CraigKC Offline
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Post: #43
Hardware/Software
Apple TV v4.1.1 Build 1553 (iOS v4.2.1)
XBMC v10.0 (Installed via apt-get)
Denon AVR-890
HDMI Audio (No Coax/SPDIF)

guisettings.xml
ac3passthrough = changed to "true"
dtspassthrough = changed to "true"
channellayout = left unchanged (value was "7" for my 5.1 setup)

I had the same bad stereo downmix problem as everyone else where FL+FR=FR and RR+RL=FL when playing AC3/DTS .mkv files with stock installation. After changing guisettings.xml as bruienne suggested, passthrough works beautifully on a handful of MKV files I've spot tested (all DTS, not sure if I have any AC3 to test or not).

This fixed my only major issue discovered so far with XBMC on iOS, great post!
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DN38416 Offline
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Location: Coffs Harbour, Australia
Post: #44
bkim Wrote:I found the solution to our problems...

For <channellayout>7</channellayout>

Change it to 5. Make sure you're doing this while exitted out of xbmc.

DTS now properly shows up on my receiver Big Grin

Awesome!
Thanks mate I'll give it a try.

At the moment I'm trying to re-jailbreak it. I restored it last night and now I keep getting errors in iTunes for some reason.. it's driving me nuts.
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iLLNESS Offline
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Post: #45
dazex Wrote:When checking what firmware or IOS version you are running from the aTV2. Pressing the center button will toggle between firmware -> IOS ->something else, I forget.

-Dazex

you are %100 correct. pressing the center button toggles between software version, software build and OS Build version. i show (in same order) 4.1.1, 1553 and 4.2.1 (8c154)

iOS XBMC users PLEASE use the advanced search function before starting a new thread. Make sure to click on 'XBMC for iOS Specific Support' so your results are narrowed down correctly.

Please make sure to visit the Sticky section for common issues/questions/etc. Also, XBMC for iOS information
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DN38416 Offline
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Location: Coffs Harbour, Australia
Post: #46
bkim Wrote:I found the solution to our problems...

For <channellayout>7</channellayout>

Change it to 5. Make sure you're doing this while exitted out of xbmc.

DTS now properly shows up on my receiver Big Grin

Bummer.. didn't work for me Sad

All it does is change the speaker config to 4.0 instead of 5.1
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bkim Offline
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Post: #47
DN38416 Wrote:Bummer.. didn't work for me Sad

All it does is change the speaker config to 4.0 instead of 5.1

try these settings:

<audiooutput>
<ac3passthrough>true</ac3passthrough>
<audiodevice>Default Output Device</audiodevice>
<channellayout>5.1</channellayout>
<dontnormalizelevels>false</dontnormalizelevels>
<dtspassthrough>true</dtspassthrough>
<mode>1</mode>
<passthroughaac>false</passthroughaac>
<passthroughmp1>false</passthroughmp1>
<passthroughmp2>false</passthroughmp2>
<passthroughmp3>false</passthroughmp3>
</audiooutput>

it mite also help if i told u that mine's connected through both hdmi and optical, with the sound using the digital optical setting. make sure xbmc is not on when you're saving the settings
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jkbrowne Offline
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Post: #48
No go for me....

Hardware/Software
Apple TV v4.1.1 Build 1553 (iOS v4.2.1)
XBMC v10.0 (Installed via apt-get)
Denon AVR-2700
SPDIF (optical) from ATV2 to the receiver

guisettings.xml
ac3passthrough = changed to "true"
dtspassthrough = changed to "false" (no DTS on the AVR-2700)
channellayout = left unchanged (value was "7" for my 5.1 setup)

This did not work for me. When playing any MKV file (tried a-bunch) with AC3 audio, I get one or two "click" or "pop" sounds then silence. Movie plays with no audio and receiver remains in Pro Logic mode. It should switch to DD mode when playing these files.

So apparantly this fix does not work for everyone. The question is why? One difference with my setup is my receiver does not support DTS. Maybe that's the variable?

:-(
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bkim Offline
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Post: #49
jkbrowne Wrote:No go for me....

Hardware/Software
Apple TV v4.1.1 Build 1553 (iOS v4.2.1)
XBMC v10.0 (Installed via apt-get)
Denon AVR-2700
SPDIF (optical) from ATV2 to the receiver

guisettings.xml
ac3passthrough = changed to "true"
dtspassthrough = changed to "false" (no DTS on the AVR-2700)
channellayout = left unchanged (value was "7" for my 5.1 setup)

This did not work for me. When playing any MKV file (tried a-bunch) with AC3 audio, I get one or two "click" or "pop" sounds then silence. Movie plays with no audio and receiver remains in Pro Logic mode. It should switch to DD mode when playing these files.

So apparantly this fix does not work for everyone. The question is why? One difference with my setup is my receiver does not support DTS. Maybe that's the variable?

:-(

try connecting with the optical cable instead... and change the channellayout to "5.1" in the xml
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DN38416 Offline
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Location: Coffs Harbour, Australia
Post: #50
Well I figured out my problem. It was the firmware. (At least, I think it was)
I updated to the latest one 4.2.1 (4.1.1 whichever it is) and it worked!

Only problem is it's a tethered jailbreak... absolute pain in the ass Sad
I had to move my pc over to the tv to do it... so annoying, but it paid off in the end Smile

EDIT: BTW.. I'm connected via HDMI and it's fine. channellayout was left on 7.
(This post was last modified: 2011-01-24 09:11 by DN38416.)
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