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5.1 thru Amp but won't play any sound for iTunes music or iTunes Trailers

4240 Views 13 Replies Latest reply: May 1, 2009 10:53 PM by Eden Sarfaty RSS
Stu Sumner Calculating status...
Currently Being Moderated
Apr 25, 2009 6:54 AM
Unusual problem that I can't seem to resolve. I have my ATV connected via HDMI to my TV, it then outputs to an amp via a digital audio output connection on the TV. The ATV has no problems outputting 5.1 and 2.0 off Handbrake rips of my DVD collection but the amp plays no sound from any music or itunes trailers. I've connected the ATV directly to my amp thru an optical link and it plays everything fine apart from the expected echo between TV and Amp sound so I know that the Amp will play music and trailers but why won't it play anything thru the HDMI connection?


Philips 32" LCD
Pioneer C100 Receiver
ATV connected to TV via Octava 3way HDMI switch
15" MacBook Pro 2ghz 2gb Ram, Mac OS X (10.5.6), White 16g 3G iPhone, 2009 2Ghz Mac Mini
  • Alley_Cat Level 6 Level 6 (16,625 points)
    If you haven't tried connecting directly to the TV bypassing the switch try that as not all switches or amps work perfectly with Apple Tv over HDMI.

    Are you saying Tv gets it's video/audio via HDMI through an HDMI switch and tehn you use iptical from TV to amp? If so I think you then suggest that audio to TV relayed to amp works ok for 5.1 audio (and maybe 2.0) but not for movie trailers or music trailers. Does it work for music synced or streamed to AppleTV?

    Not all TVs can relay HDMI digital audio through their digital outs unless the audio is from the internal tuner, or is in a recognised format. It my be that the TV can relay dolby digital 5.1 but rejects non-surroud audio which typically gets output as linear PCM over optical. I'd check your TV manual - these things are often buried in small print.

    Also I woder if the input accepting digital out from TV to amp may be on the wrong setting - could it be set to accept dolby digital but not linear PCM - if the inputhas an Auto setting try that.
    iMac Core 2 Duo 20", Mac OS X (10.4.11), Intel Macbook, iPhone, old Risc OS and Windows boxes!
  • Chenks Level 5 Level 5 (7,420 points)
    Stu Sumner wrote:
    The TV routes digital audio out from a Sky HDMI input

    DD5.1 is not carried over HDMI on a Sky box. you have to use optical to get 5.1 on a sky box.
     MBP C2D 2.4GHz  Mac Mini G4  AppleTV  iPhone 3G 16GB  iPod Classic 80GB, Mac OS X (10.5.6)
  • Alley_Cat Level 6 Level 6 (16,625 points)
    I think you need to rule out the switch or HDMI input being the problem.

    Try each TV HDMI input with AppleTV connected direct not via the switch. If it works it implies the switch/AppleTV combination is at fault. If one HDMI input works but the other doesn't, it may be they are not quite equal, in which case can you swap over sky and switch connections?
    iMac Core 2 Duo 20", Mac OS X (10.4.11), Intel Macbook, iPhone, old Risc OS and Windows boxes!
  • Alley_Cat Level 6 Level 6 (16,625 points)
    You haven't accidentally turned the music volume down (up and down arrows on remote if volume control enabled in settings) - it doesn't work on all things, only music from memory.
    iMac Core 2 Duo 20", Mac OS X (10.4.11), Intel Macbook, iPhone, old Risc OS and Windows boxes!
  • Michael Bowyer Level 2 Level 2 (325 points)
    I have exactly the same problem, although I'm using a processor which extracts the HDMI audio directly. HDMI Audio from other sources works as expected, but on selecting AppleTV, it won't always work. Sometimes power cycling the processor or TV helps, which makes me think its some sort of HDCP handshake problem. The only solution was to use a Toslink Optical cable for audio. Glad to know I'm not alone, hopefully this will get fixed with an update.
  • Alley_Cat Level 6 Level 6 (16,625 points)
    It's bizarre that you get menu sounds and no music.

    One of the TV manual pages says that the digital out can relay Dolby Digital signals - I initially thought this means it only relays dolby digital encoded stuff, but I can't see that menu audio is being sent as dolby digital encoding but you never know. The TV might just be dropping trailer/music audio as it's not in dolby digital format.

    It could be an odd configuration issue that might (or might not) be cured by a factory restore of AppleTv but that would wipe all content and settings and require reconfiguration/software updates from scratch - last resort option to try.

    I assume that the Tv internal speakers (if it has them) play back music/trailer audio over HDMI (with no analogue connected)? If so, it seems likely the set just isn't forwarding non DD audio bitstreams.
    iMac Core 2 Duo 20", Mac OS X (10.4.11), Intel Macbook, iPhone, old Risc OS and Windows boxes!
  • crushatv Calculating status...
    same issue with an Arcam solo movie system, returned it to Arcam and they clearly demonstrated that its the Apple TV thats at fault, seems the last ATV update changed the digital output requirements, you now need to overlay two sounds tracks to have this feature, come on Apple play fair stop changing the rules!
    mini, Mac OS X (10.5.6), airbook
  • Eden Sarfaty Level 1 Level 1 (80 points)
    If your receiver has both HDMI and component inputs and outputs, try passing both audio and video from the ATV to the receiver first, then from the receiver to speakers and TV. This works well for me. I use digital audio and component video from the ATV to the receiver, and component video to the TV. Short runs, excellent signal, no audio-video sync problem. I use the HDMI for the cable box.
    iMac Core2Duo 20' 2.4, Mac OS X (10.5.6), PowerMac G4 Quicksilver (CPU upgrade); LaCie network drive; Airport Extreme; ATV


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