Downmixing audio but keeping 5.1 surround sound?

Discussion in 'Apple TV and Home Theater' started by orestes1984, Nov 16, 2012.

  1. macrumors 65816

    Joined:
    Jun 10, 2005
    Location:
    Australia
    #1
    What tools do you use when you want to downmix AC3 audio such as DTS tracks to Dolby Digital?

    I'm using Subler, but I feel like I'm missing something. How do I go about down mixing to 5.1 rather than Pro Logic fake 5.1.
     
  2. macrumors 6502

    Joined:
    May 24, 2009
    #2
    I use Handbrake to do full encoding of video and audio, and it does support true Dolby 5.1 audio. I dont know if Subler supports it as I have only used it for adding Metadata to my encodes.

    The downside to using handbrake is that it requires a full encode (many hours), however your other option is to go in to handbrake, set all of the settings for video to a ridiculously low amount, convert the audio you want, then mux the video from the original, and the audio from the encoded file, in subler. This should only take a few minutes.
     
  3. macrumors 603

    Joined:
    Jun 7, 2011
    #3
    Subler can't downmix to AC-3, only to AAC. Use the latest beta of MP4Tools, it can downmix to AC-3 even in batch mode.

    These are teh settings you'll need to use in non-batch mode (feel free to tell me if you also need the settings in batch mode), here, showing the Monsters video ( http://www.auby.no/files/video_tests/h264_1080p_hp_4.1_10mbps_dts_unstyled_subs_monsters.mkv ) as an input. I've annotated the radio button you must select:


    [​IMG]
     
  4. orestes1984, Nov 17, 2012
    Last edited: Nov 17, 2012

    thread starter macrumors 65816

    Joined:
    Jun 10, 2005
    Location:
    Australia
    #4
    Thanks, so I either reencode to grab the 5.1 sound or I use MP4 Tools. At least now I know that I wasn't doing anything wrong and now I can get down to sorting out my audio tracks so they can be played on my Apple TV in 5.1.

    Cheers guys.
     
  5. macrumors 603

    Joined:
    Jun 7, 2011
    #5

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