1 2 Previous Next 17 Replies Latest reply: May 15, 2011 8:10 PM by Jon Walker
hostel6 Level 1 Level 1 (5 points)

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
  • 1. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    On the plus side, the new shape and colour makes the new ATV the perfect paper weight...

  • 2. Re: ATV2 and 5.1 sound issues.
    Rudegar Level 6 Level 6 (19,520 points)

    sounds like a problem with the encoding program or settings used

  • 3. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Yes, I agree. I have gone back to the software vendor.

     

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

  • 4. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Ok, so I downloaded a podcast from iTunes that I knew was encoded with 5.1 and after changing my Dolby output setting to 'ON' it played fine and my AV unit recognised it as DD.

     

    So at least I know that its possible to play 5.1 througth ATV2.

     

    Now all I need is a way to convert my movie collection...

  • 5. Re: ATV2 and 5.1 sound issues.
    Jon Walker Level 6 Level 6 (17,630 points)

    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.

     

    small_white_chi.gif

  • 6. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Thanks for your reply Jon. Sadly this is a piece of software that i do not have and I cant really afford right now. Thank you for your time in replying though, it is much appreciated.

     

    Mark

  • 7. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Not sure if this helps?

     

    Audio Codec aac

    Audio sample rate 48000

    Audio Bitrate 96000

    Audio Channels 5.1

    Video codec h264

    Video size 1280x720

    Video bitrate 768

    Video frame rate 23.976

    File size 6.821g

  • 8. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Drastic measures required, another thread has a number of posters who have successfully rolled back the most recent upgrade. Until such a time that another solution presents itself I will give this a try.

     

    Mark

  • 9. Re: ATV2 and 5.1 sound issues.
    Jon Walker Level 6 Level 6 (17,630 points)

    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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  • 10. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Jon

     

    Thank you once more for taking the time to answer my question.

     

    I will apply your settings to see if I have any more luck.

     

    Have a great day.

  • 11. Re: ATV2 and 5.1 sound issues.
    hostel6 Level 1 Level 1 (5 points)

    Answer was to buy a micro USB and rollback the latest update.

     

    I immediately got back;

     

    Full 5.1 audio on movies

    Ability to start a movie from the middle

    Airplay with Djay iPad app

     

    Very disappointed with the 4.3 upgrade and will not be doing any further firmware changes until i know its safe.

  • 12. Re: ATV2 and 5.1 sound issues.
    huff3566 Level 1 Level 1 (0 points)

    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.

  • 13. Re: ATV2 and 5.1 sound issues.
    Jon Walker Level 6 Level 6 (17,630 points)

    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.

     

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  • 14. Re: ATV2 and 5.1 sound issues.
    huff3566 Level 1 Level 1 (0 points)

    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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