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Average size of audio track on blu ray disc?

post #1 of 9
Thread Starter 
Hey, as I just registered you may yell at me if the thread is in the wrong location but please read this first.

Could anyone tell me what the size of the audio part of any blu ray movie?
I'm thinking movies like Avatar. (well, any movie using almost the full size of the BD)

Lets say that we would remove the video file and only keep a 7.1 Audio track, what would the size be for that track?

Since you are excellent with the numbers and specifications i figured this was the best place to ask.

Thanks!

edit: I suck at this but the audio bitrate is Bit per second right? What is the most usual audio bitrate of todays full size blu rays?
So sorry if this is suppose to be in the specifications thread but i didn't want to ruin the spec spree with my questions.
Edited by MattzorLQ - 10/28/12 at 7:09am
post #2 of 9
The DTS-MA audio track for Avatar is about 4.8GB.
post #3 of 9
Thread Starter 
Thank you!
post #4 of 9
Quote:
Originally Posted by MattzorLQ View Post

Hey, as I just registered you may yell at me if the thread is in the wrong location but please read this first.

Could anyone tell me what the size of the audio part of any blu ray movie?
I'm thinking movies like Avatar. (well, any movie using almost the full size of the BD)

Lets say that we would remove the video file and only keep a 7.1 Audio track, what would the size be for that track?

Since you are excellent with the numbers and specifications i figured this was the best place to ask.

Thanks!

edit: I suck at this but the audio bitrate is Bit per second right? What is the most usual audio bitrate of todays full size blu rays?
So sorry if this is suppose to be in the specifications thread but i didn't want to ruin the spec spree with my questions.
This is the thread you'll want to check out for specific audio information from most BDs. It lists the sampling rate and bit depth for many popular Blu-rays.

http://www.avsforum.com/t/1155731/new-unofficial-blu-ray-audio-and-video-specifications-thread/0_60
post #5 of 9
Thread Starter 
Well unfortunately I dont understand what size the tracks have.. There are so many numbers and names.
post #6 of 9
Quote:
Originally Posted by MattzorLQ View Post

Well unfortunately I dont understand what size the tracks have.. There are so many numbers and names.
Go down the page and click on one of the movies that has a link in its title. Here for example is Sword Of The Stranger:

http://www.avsforum.com/t/1155731/new-unofficial-blu-ray-audio-and-video-specifications-thread/360_60#post_17127461

Check out the audio section of the BDInfo report, scanned directly from the actual digital file on the Blu-ray. Here is the English soundtrack on Sword of the Stranger:


Dolby TrueHD Audio English 1614 kbps 5.1 / 48 kHz / 1614 kbps / 16-bit (AC3 Core: 5.1 / 48 kHz / 640 kbps)


The TrueHD soundtrack runs at 16-bit/48kHz, pretty standard for a modern movie. You can calculate the total audio file size by taking the 1614 kbps figure and multiplying it by the total length in seconds of the movie. That gives you the total audio size in kilobits, which can be converted to megabytes.
post #7 of 9
Thread Starter 
Thanks!smile.gif
post #8 of 9
Quote:
Originally Posted by Phantom Stranger View Post

Go down the page and click on one of the movies that has a link in its title. Here for example is Sword Of The Stranger:
http://www.avsforum.com/t/1155731/new-unofficial-blu-ray-audio-and-video-specifications-thread/360_60#post_17127461
Check out the audio section of the BDInfo report, scanned directly from the actual digital file on the Blu-ray. Here is the English soundtrack on Sword of the Stranger:
Dolby TrueHD Audio English 1614 kbps 5.1 / 48 kHz / 1614 kbps / 16-bit (AC3 Core: 5.1 / 48 kHz / 640 kbps)
The TrueHD soundtrack runs at 16-bit/48kHz, pretty standard for a modern movie. You can calculate the total audio file size by taking the 1614 kbps figure and multiplying it by the total length in seconds of the movie. That gives you the total audio size in kilobits, which can be converted to megabytes.

Can you explain this easier? I suck at math. redface.gif
post #9 of 9
Quote:
Originally Posted by saprano View Post

Can you explain this easier? I suck at math. redface.gif

To avoid math: many of the BDInfo reports in the specs thread have a "Stream Diagnostics" section at the end, which shows the size in bytes for each video/audio/graphics stream.

For example, Avatar's video and audio size is about ~35GB and ~5GB respectively:
Code:
STREAM DIAGNOSTICS:

File            PID             Type            Codec           Language                Seconds                 Bitrate                 Bytes           Packets         
----            ---             ----            -----           --------                --------------          --------------          -------------   -----           
00002.M2TS      4113 (0x1011)   0x1B            AVC                                     9701.567                28,817                  34,946,248,728  190,060,476     
00002.M2TS      4352 (0x1100)   0x86            DTS-HD MA       eng (English)           9701.567                4,146                   5,027,442,684   28,836,317      

It's worth noting that stream diagnostics byte count is the "raw" stream only - i.e. stripped of M2TS container overhead. The actual size on disc is about 5% larger and can be approximated by multiplying the packet count by 192 bytes.
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