Multichannel Part 2 - The Export Factor
Greetings, everyone. For a final wrap-up on the topic of multichannel file editing, I wanted to showcase the last step in the process: exporting your mastered audio from Soundbooth back into Premiere Pro, or even perhaps a third-party software for authoring multichannel discs (audio-only *or* DVD/Blu-Ray). In either case, we're still dealing with uncompressed, 32-bit WAV information. The files needn't be encoded *before* inserting into Premiere, but you would want to encode to Dolby Digital or DTS if you're looking to author DVDs with 5.1 audio through Encore CS4.
Now, I had a few emails after the first post asking, "Well, what do I do with the interleaved file once I've edited/mastered it in Soundbooth?" and the answer is simple: you export out as individual 'stems', each one representing the individual channels, ie, Front Left, Front Right, Left Surround, Right Surround, Center, Sub (LFE). Soundbooth CS4 will not allow you to re-export an interleaved file...but this is fine, as you'll typically want stems anyway, and as mentioned, many third party softwares require either Dolby or DTS-encoded media, or individual 5.1 mono stems; and that's what we'll do here...
Here's the menu where you'll export your mono channels

Once you've exported the stems, you can re-import these files into a Premiere Pro project. Since you'd ideally want to be able to monitor your 5.1 surround, you'll want to create a sequence whose master audio output is set to 5.1, and 'add' a minimum of 6 mono audio tracks to your new sequence. When you do this, you'll see the surround panner appear in the Audio Mixer for each track. There, you can use the little 'puck & dish' (as they used to call it) and move each puck to it's respective position, adjusting individual Center & Sub Levels with the knobs.
Here you can see that I've created a 5.1 master, with each channel labeled, and each track panned to the appropriate position. Notice that only the Center Channel has the center level adjusted; same goes for the Sub channel

Setting the audio hardware monitoring. Here, I'm using a MOTU Traveler audio device

At this point, you're ready to export the entire sequence, and here's where you have some options. Premiere Pro CS4 ships with Minnetonka's SurCode plug-in for Dolby Digital exporting. You'll get three 'tries' to test it out and create true, Dolby Digital soundtracks, which you can them import into an Encore CS4 project and burn REAL, Dolby Digital multichannel DVDs. Beyond the three tries, you have to purchase the plugin. But the cool thing is that you can do this DIRECTLY in the software by clicking on the Codec Settings button. For me, because my video content was edited in HiDef, I chose Blu-Ray DVD as my starting Export preset, and then selected the audio options I wanted. You've got great control over the audio export here, with data rates up to 640kbps.
Modify the data rates, adjust fold-down and attenuation settings. Great control with SurCode

Now, many people often want to use DTS in lieu of Dolby. Minnetonka also makes a DTS encoder software (in many variations) and the exports generated from there can be imported into Encore CS4 as well. Remember: Encore CS4 will not encode audio to multichannel Dolby or DTS. You have to import pre-encoded files to author surround DVDs. It will only encode standard Dolby Stereo, if left with raw audio material.
And that, my friends, is how you you work with multichannel across the Production Premium applications and Audition 3.0.1. All in all, an incredible amount of control and flexibility, all in the palm of your hands. And definitely be sure to check out SurCode. Once you've done surround for video, it's hard to go back to stereo...believe me!
If anyone's interested, I've got an entire workflow explaining how to take stereo (or even MONO content) and reversioning it for Surround Sound playback. This was a workflow that I actually developed and used as a training bed for several engineers at the BBC, along with my good friend and colleague, Michael O'Neill. It's pretty heavy stuff, and would take quite some time to write up (as I've never officially done that). But, if I get enough interest, I'd be game. Naturally, this entire process would be done in Audition.
Until next time,
Blog on.






