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ATV2 and 5.1 sound issues.

1031 Views 17 Replies Latest reply: May 15, 2011 8:10 PM by Jon Walker RSS
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hostel6 Calculating status...
Currently Being Moderated
Apr 27, 2011 6:25 AM

Hi alll

 

I have read much about ATV2 not been able to play 5.1 audio, yet I can't get to the bottom of whether there is a fix or work around. I have many movies that are on my mac that play fine but with no sound when watched via ATV2? Equally, I have 2 where they are encoded in stereo that play perfectly.

 

I have called apple but they couldn't really help.

 

Any assistance greatly appreciated.

 

Mark

 iMac 2.8 GHz  G4 2.66 GHz Dual-Core Xeon  iPhone 4  iPad  apple TV , Mac OS X (10.6.6), Snow leopard 10.6.6
  • Rudegar Level 6 Level 6 (18,580 points)
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    Apr 27, 2011 8:31 AM (in response to hostel6)

    sounds like a problem with the encoding program or settings used

  • Jon Walker Level 6 Level 6 (17,520 points)
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    Apr 27, 2011 9:21 AM (in response to hostel6)

    It is frustrating that the software is able to produce a file that will playback through iTunes and not ATV.

    If you have QT 7 Pro installed, it might be beneficial to post a copy of the "Properties" window to the discussion to help determine particular problems or settings required for TV2 playback. As to files playing in iTunes but not via TV2, there could be many different reasons for this to happen and many are easily solved.

     

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    2.66GHz 17" MBP 2.0GHz 3GB G5/533MHz 384MB G4 DeskTop/400MHz 384MB G4 Ti PB, Mac OS X (10.6.6), 60GB 5G iPod, 4GB iPhone, Nikon D-70, Nikon CoolPix 990, Sony HD
  • Jon Walker Level 6 Level 6 (17,520 points)
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    Apr 27, 2011 3:57 PM (in response to hostel6)

    Audio Codec aac

    Audio sample rate 48000

    Audio Bitrate 96000

    Is this the file that won't play audio? Apple products would not like a "stereo" audio track encoded at 96 Kbps and 48 KHz sampling rate. (Mono would be OK here.) Either up the audio data rate to 128 or 160 Kbps for 48 KHz or reduce the sampling rate to 44.1 KHz for a 96 Kbps data rate. The context adaptive presets used by QT apps for TV would be 128 Kbps and 44.1 KHz. (I prefer 160 Kbps at 48 KHz.)

     

    Video bitrate 768

    Generally speaking, this is a somewhat low video data rate for average graphic complexity. I would normally use something in the 3.5 to 5 Mbps range  unless the content is an anamorphic encode. (As an example, an iPhone 3gs file would normally be encoded with a total target data rate on the order of 1.0 Mbps (and I would usually use something more in the 1.5 to 1.7 Mbps range for my own content). While I don't think this would create a movie with an all "black" screen, that can happen id the video data rate drops too low and is usually preceded by a pixellation of the macro blocks before reaching the "black" screen stage.

     

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    2.66GHz 17" MBP 2.0GHz 3GB G5/533MHz 384MB G4 DeskTop/400MHz 384MB G4 Ti PB, Mac OS X (10.6.6), 60GB 5G iPod, 4GB iPhone, Nikon D-70, Nikon CoolPix 990, Sony HD
  • huff3566 Level 1 Level 1 (0 points)
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    May 6, 2011 5:19 PM (in response to hostel6)

    Is this issue being worked on by Apple?

     

    I am so frustrated and wasted so much time playing around with this to try to get it working again. I expected more from Apple. This really makes me think twice about putting money into other Apple products.

  • Jon Walker Level 6 Level 6 (17,520 points)
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    May 6, 2011 5:42 PM (in response to huff3566)

    Is this issue being worked on by Apple?

    What issue? With the exception of the change to reading descriptions, everything continues to work fine on my system under the latest IOS. As to encoding problems, Apple QT presets would normally prevent improper/incompatible setting combinations while third-party apps may not. With regard to what Apple is or is not working on, only they know for sure and have a well established history of not saying.

     

    small_white_chi.gif

    2.66GHz 17" MBP 2.0GHz 3GB G5/533MHz 384MB G4 DeskTop/400MHz 384MB G4 Ti PB, Mac OS X (10.6.6), 60GB 5G iPod, 4GB iPhone, Nikon D-70, Nikon CoolPix 990, Sony HD
  • huff3566 Level 1 Level 1 (0 points)
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    May 6, 2011 8:37 PM (in response to Jon Walker)

    There continues to be issues with Dolby Digital that needs to be resolved. I have files that worked fine earlier, but now have issues and take a lot of workaround to be played properly by ATV2.

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