Difference between revisions of "User:Jeff Kelley/Multichannel Audio"

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*** work in progress ***
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&nbsp;&nbsp;&nbsp;'''WORK IN PROGRESS'''
</div>
 
== Introduction ==
 
Since QuickTime 7, it is possible to deliver multichannel audio. Second Life streamed audio relies on QuickTime and inherits this capability without further work.
 
== Producing a multichannel audio movie ==
 
We are using ProTools. Export a multichannel track (ou bounce a multichannel master fader) to multimono files. Here is an example with a 5.1 (L C R Ls Rs Lf) track and the six mono files you get.
 
[[Image:PT Multichannel Track.png]]
[[Image:PT Multimono Files.png]]
 
In QuickTime Pro, create a new movie then import the six mono files. You have to open each of the six tracks, select all, "Add to Movie" with playhead at start. Tedious, but we will come with a better solution soon. Now, "Show Movie Properties" then "Audio Settings".
 
[[Image:QT Audio Tracks Assign.png]]
 
Assign carefully each track. Note that you can see the original filenames in the "Resources" tab.
 
==== Mapping between QuickTime and industry-standard labeling ====
{|{{Prettytable}}
!
!
! Mono
! Stereo
! Cinema Stereo
! Quadraphonic
! Dolby ProLogic
! Film (Dolby Digital)
! SMPTE/ITU
! DTS
! Dolby Surround EX
! SDDS
|-
| Left
| L
|
| x
|-
| Right
| R
|
| x
|-
| Center
| C
| x
|-
| LFE Screen
| LFE
|-
| Left Surround
| Ls
|-
| Right Surround
| Rs
|-
| Left Center
| Lc
|-
| Right Center
| Rc
|-
| Center Surround
| Cs
|-
| Rear Surround Left
| Lr
|-
| Rear Surround Right
| Rr
|}
 


'''NOTE:''' delete [[:Image:Jef Kelley Images QT Audio Tracks Assign.png]] (stupid one)


'''NOTE:''' rename [[:Image:QT Audio Tracks Assign.png]] to [[Image:Jeff Kelley QT Audio Tracks Assign.png]]


[[Image:Jef_Kelley_Images_QT_Audio_Tracks_Assign.png]]
'''NOTE:''' delete [[:Image:Jef Kelley Images QT Audio Tracks Assign.png]] (stupid one)

Revision as of 00:04, 25 December 2007

   WORK IN PROGRESS

Introduction

Since QuickTime 7, it is possible to deliver multichannel audio. Second Life streamed audio relies on QuickTime and inherits this capability without further work.

Producing a multichannel audio movie

We are using ProTools. Export a multichannel track (ou bounce a multichannel master fader) to multimono files. Here is an example with a 5.1 (L C R Ls Rs Lf) track and the six mono files you get.

PT Multichannel Track.png PT Multimono Files.png

In QuickTime Pro, create a new movie then import the six mono files. You have to open each of the six tracks, select all, "Add to Movie" with playhead at start. Tedious, but we will come with a better solution soon. Now, "Show Movie Properties" then "Audio Settings".

QT Audio Tracks Assign.png

Assign carefully each track. Note that you can see the original filenames in the "Resources" tab.

Mapping between QuickTime and industry-standard labeling

Mono Stereo Cinema Stereo Quadraphonic Dolby ProLogic Film (Dolby Digital) SMPTE/ITU DTS Dolby Surround EX SDDS
Left L x
Right R x
Center C x
LFE Screen LFE
Left Surround Ls
Right Surround Rs
Left Center Lc
Right Center Rc
Center Surround Cs
Rear Surround Left Lr
Rear Surround Right Rr



NOTE: delete Image:Jef Kelley Images QT Audio Tracks Assign.png (stupid one)

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