Multichannel Mapping

farss wrote on 10/10/2009, 5:59 PM
I think I've managed to mostly nut this out except for one thing.
From two stereo tracks routed to two stereo busses in Vegas I'd like to create a single wav file that contains two stereo channels. I can get 4 mono channels but as one of the tracks is from a stereo mic I'd like to keep it that way.

The purpose is to simplify editing the multicam video. I do this the old way and anything that keeps the track count and the number of things to keep an eye on staying in sync is a big help.

Bob.

Comments

rraud wrote on 10/11/2009, 6:22 AM
Right-click the event; select: "Channels" Left or Right.
Mix & render as a new track/file if desired.
farss wrote on 10/12/2009, 12:46 AM
I had thought of that solution but it's what I'm trying to avoid.

I could route the two panned mono tracks to a buss and route the other mono source to another buss and mix using envelopes on the buss tracks. That would work but it means even more track on an already cluttered timeline that's hours long and needs a lot of editing of vision as well as mixing. Keep in mind that as these are wild recordings I'm also having to check sync and adjust it at the start of each segment.

Of course all this angst would go away IF Vegas supported timecode in audio.

Bob.
pwppch wrote on 10/12/2009, 10:49 AM
I'd like to create a single wav file that contains two stereo channels

To be clear: You want a wave file rendered that has TWO stereo pair streams - for a total of 4 audio channels.

If this is the case, you can enable multichannel mapping in the Render As dialog. You then open the Channel mapping dialog and select Bus A and Bus B.

You will get a wave file with 4 channels.


Peter
farss wrote on 10/12/2009, 6:50 PM
"You want a wave file rendered that has TWO stereo pair streams - for a total of 4 audio channels."

Yes please.

"If this is the case, you can enable multichannel mapping in the Render As dialog. You then open the Channel mapping dialog and select Bus A and Bus B"

Done that. I create Bus A and Bus B, assign track 1 to Bus A, Track 2 to Bus B. In Channel Mapping dialog I tick the boxes and get Bus A assigned to channels 1,2 and Bus B assigned to channels 3,4.

I render out to wav, drag it back into Vegas and get 4 mono channels, not two stereo pairs.

After repeating this several times, trying everything and going nowhere fast I cracked it!
Yes, I get 4 mono channels on 4 tracks. RClicking and selecting Channels I can assign top most channel as channels 1,2 and the next one down as 3,4. Click Ignore Event Grouping and delete remaing mono channels on tracks 3 and 4 and I am in audio nirvana.

Now if I manage to slip events on track 2 out of sync with track 1 Vegas throws up a warning and I KNOW this has happened. This will make my editing ever so much easier. A million thanks.

Bob.



pwppch wrote on 10/13/2009, 8:46 AM
I render out to wav, drag it back into Vegas and get 4 mono channels, not two stereo pairs.

Yes, this is the rub. Wave does not define the notion of "multiple stereo pairs" in a file. It supports multichannel or multimono.

There are different applications for such media. We can only "guess" as to the desired use cases.

Having said, this, we are looking at ways to solve this particular media issue.

Peter
musicvid10 wrote on 10/13/2009, 1:41 PM
Bob, I believe one workaround posted in a much older thread is to use your pan controls and "Render to new track" a stereo file from each pair of mono files.

Although a bit of a kludge, I seem to recall it produced a satisfactory result.
farss wrote on 10/13/2009, 8:54 PM
That gets me back to where I started from!

My R-4 records it's 4 inputs as two stereo files, well that's one option. In this case I had an XY mic on one of the pairs and a feed from the house mix in the other. I need to keep all this in sync as I edit two vision tracks. Grouping doesn't really meet my needs as I need to keep changing the groups as I resync to correct for drift between cameras and recorders. More than once by mistake I managed to nudge one of the tracks from the R-4 out of sync with the other. Doing what I've described above if that happens Vegas warns me.

I guess until you have to deal with this kind of a problem you'd wonder why all the fuss. For me getting this working the way I want will save a lot of time.

Bob.
pwppch wrote on 10/13/2009, 10:08 PM
I guess until you have to deal with this kind of a problem you'd wonder why all the fuss. For me getting this working the way I want will save a lot of time.

This type of workflow is something we get a lot of feedback on. Maybe not exactly the same problem, but similar in many ways.

Please, keep talking about it and suggest workflows we can provide that will make it easier.

Peter

jbolley wrote on 10/14/2009, 11:15 AM
Bob,
I've had this type of scenario before. It worked best for me to sync everything before I start editing. Drift is usually fairly constant so once it's fixed it's fixed, then grouping works a lot easier. Just a suggestion. Good luck!
Jesse
farss wrote on 10/15/2009, 3:54 AM
Sure,
I get everything in sync, the issue is keeping it that way as I work through the show.

Camera audio and vision should always stay locked. The two stereo tracks from the R-4 should stay locked. Most of the time I want all of it locked. But then I want to split camera 1. I have to ungroup to do this and doing that ungroups everything. I hit Ignore Event Grouping and make the split. Then I turn it back on and bingo, the track I split has dropped out of the group. This is quite a problem in itself. Events to the left of a split always seem to keep their grouping, events to the right seem to have a will of their own.
The outcome is I'm doing a lot of regrouping just to be certain. If I slip a track by mistake I get no indication this has happened either unless its an A/V pair from a camera. At least rendering the two tracks from the R-4 into the one file causes Vegas to give me indication when this happens.

There's many things that would improve my workflow(s).

1) Ability to lock tracks.
2) If sound and vision from a camera would always stay in sync unless conscious effort was made to slip them. Ppro has this.
3) Timecoded audio tracks.
4) Something more concrete than grouping.
5) Folder tracks.

Any of the above would be good. What I've been able to get working now is really going to help so I'm very grateful for what I have now.


Bob.
rraud wrote on 10/15/2009, 9:43 AM
I find myself inadvertently nudging events out of sync all the time.( especially when trying to work fast, i.e. deadlines)
If we could lock an event to the timeline WITHOUT locking the events other parameters, that would be nice IMO.
Mahesh wrote on 11/3/2009, 2:40 PM
I just fell foul of tracks drifting out of sync. I have am just trying out a new method of keeping an eye on the sync.
I have chosen various sync points on all events and placed event markers ( naming them, shrewdly, sync 1, sync 2 etc.)
Tomorrow, when I start editing, I will keep on an eye on all the markers. They should all line-up. I should be able to see if any event drifts out of sync.

May be it will work.
jbolley wrote on 11/5/2009, 10:03 AM
mind your ripple settings!

Jesse