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Old Nov 17, 2012, 12:20 AM   #1
orestes1984
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Join Date: Jun 2005
Location: Australia
Downmixing audio but keeping 5.1 surround sound?

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.
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Old Nov 17, 2012, 03:04 AM   #2
Pyromonkey83
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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.
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Old Nov 17, 2012, 03:31 AM   #3
Menneisyys2
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Quote:
Originally Posted by orestes1984 View Post
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.
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...s_monsters.mkv ) as an input. I've annotated the radio button you must select:


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Old Nov 17, 2012, 06:30 AM   #4
orestes1984
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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.

Last edited by orestes1984; Nov 17, 2012 at 06:36 AM.
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Old Nov 25, 2012, 08:41 AM   #5
Menneisyys2
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A related tutorial: I've recently published an update to my previous MKV "add AAC to MKV files originally with AC3 audio only" tutorial at http://forums.macrumors.com/showthread.php?t=1495607
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