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post #1 of 14 Old 01-28-2016, 06:24 AM - Thread Starter
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AAC 2.0 streaming question

Hello, I hope I am posting this in the correct forum. If not, please feel free to move to the correct sub forum.

Alot of the movies that are available to stream on a streaming service I am trying out appear to only be available in AAC 2.0 stereo sound.

I find this very disappointing. My question is, I would assume there is a way to upconvert this sound to 5.1? I would assume it wouldn't be a true 5.1 digital experience if you were to do this?

Also, they show as AAC 2.0. Is there a difference between AAC 2.0 and standard 2.0? Or are they the same thing?

Anyone have any idea why alot of streaming movies are only available in 2.0 when most people would seem to have surround systems and such?

Thanks

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post #2 of 14 Old 01-28-2016, 05:07 PM
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Quote:
Originally Posted by SteveS78 View Post
Hello, I hope I am posting this in the correct forum. If not, please feel free to move to the correct sub forum.

Alot of the movies that are available to stream on a streaming service I am trying out appear to only be available in AAC 2.0 stereo sound.
What streaming service is that?
Quote:
Originally Posted by SteveS78 View Post
I find this very disappointing. My question is, I would assume there is a way to upconvert this sound to 5.1? I would assume it wouldn't be a true 5.1 digital experience if you were to do this?
Upconversion is not precisely possible, but generally if the film was mixed in 5.1 surround, then downmixed to 2.0, it has also been matrix encoded and can be decoded to 5.0 with Dolby ProLogic with reasonable results.
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Also, they show as AAC 2.0. Is there a difference between AAC 2.0 and standard 2.0? Or are they the same thing?
AAC is an audio codec, specifically Advanced Audio Coding. It's a lossy codec designed to maximize quality while reducing bandwidth of the resulting bitstream. 2.0 refers to the channel count. Films are mixed in 5.1, so Left, Center, Right, Left Surround, Right Surround and LFE (Low Frequency Effects). All of that can be encoded into two channels and then decoded with Dolby ProLogic. In fact, that's how it used to be done all the time before 5.1 existed.
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Anyone have any idea why alot of streaming movies are only available in 2.0 when most people would seem to have surround systems and such?
I don't share that experience. I regularly watch movies on Apple TV via both iTunes and Netflix. I find the audio to match the original release format in channel count, and the bitstream is Dolby Digital. 2.0 would show up for older movies with mono soundtracks, or those with tracks that only ever existed as "Dolby Stereo", the theatrical name for the 4.0 matrix encoded format that today can be decoded by ProLogic.

So, again, what service are you trying?
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post #3 of 14 Old 01-28-2016, 07:49 PM
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...and my guess is it was really AC3 2.0, not AAC, but you tell me...
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post #4 of 14 Old 01-29-2016, 05:22 AM - Thread Starter
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Originally Posted by jaddie View Post
What streaming service is that?
Upconversion is not precisely possible, but generally if the film was mixed in 5.1 surround, then downmixed to 2.0, it has also been matrix encoded and can be decoded to 5.0 with Dolby ProLogic with reasonable results.

AAC is an audio codec, specifically Advanced Audio Coding. It's a lossy codec designed to maximize quality while reducing bandwidth of the resulting bitstream. 2.0 refers to the channel count. Films are mixed in 5.1, so Left, Center, Right, Left Surround, Right Surround and LFE (Low Frequency Effects). All of that can be encoded into two channels and then decoded with Dolby ProLogic. In fact, that's how it used to be done all the time before 5.1 existed.
I don't share that experience. I regularly watch movies on Apple TV via both iTunes and Netflix. I find the audio to match the original release format in channel count, and the bitstream is Dolby Digital. 2.0 would show up for older movies with mono soundtracks, or those with tracks that only ever existed as "Dolby Stereo", the theatrical name for the 4.0 matrix encoded format that today can be decoded by ProLogic.

So, again, what service are you trying?
I am referring to some titles I have tried streaming on Netflix. I realise there are some/many in 5.1. But I have encountered this with them where some of their stuff is only 2.0.

I did notice Vudu has all of their stuff (that I could see) in 5.1. The only problem with Vudu is you have to "pay per view", rather than being able to play a flat fee.

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post #5 of 14 Old 01-29-2016, 05:40 AM - Thread Starter
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Can anyone else out there provide any feedback?

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post #6 of 14 Old 01-29-2016, 06:14 AM
 
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Sure....how are you are determining that the signal is AAC particularly?
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post #7 of 14 Old 01-29-2016, 06:32 AM - Thread Starter
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The Playstation settings show it.

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post #8 of 14 Old 01-29-2016, 06:53 AM
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Originally Posted by SteveS78 View Post
I am referring to some titles I have tried streaming on Netflix. I realise there are some/many in 5.1. But I have encountered this with them where some of their stuff is only 2.0.
Can you give specific examples?

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post #9 of 14 Old 01-29-2016, 06:57 AM - Thread Starter
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Can you give specific examples?
[/QUOTE]
Not off hand. They were not so mainstream titles, but I am at work now with no access to my setup at home. I was just playing around with it the other day, not really watching anything specifically, just trying to experiment.

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post #10 of 14 Old 01-29-2016, 07:02 AM
 
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The Playstation settings show it.

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When I play a 2ch Netflix show on my PS3 it shows 2.0 (primary) and my avr advises it is 48kHz PCM. What are your audio settings in your PS? Which PS? What show?
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post #11 of 14 Old 01-29-2016, 07:05 AM - Thread Starter
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When I play a 2ch Netflix show on my PS3 it shows 2.0 (primary) and my avr advises it is 48kHz PCM. What are your audio settings in your PS? Which PS? What show?
PS3...not sure. Not home now.

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post #12 of 14 Old 01-29-2016, 07:08 AM
 
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PS3...not sure. Not home now.

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Yeah I can tell since you still have the stupid tapatalk signature enabled.

Let me know a show or two that shows that, I'd like to see if I could also see AAC.
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post #13 of 14 Old 01-29-2016, 07:12 AM
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The Playstation settings show it.

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Which Playstation, and how is it connected to your system? Is the Netflix app set to 5.1?
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post #14 of 14 Old 01-29-2016, 07:13 AM - Thread Starter
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Which Playstation, and how is it connected to your system? Is the Netflix app set to 5.1?
PS3, connected via HDMI, some stream play in 5.1. Not sure about Netflix setting right now.

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