MiniDV 4-Channel Audio

jetdv wrote on 4/8/2002, 2:31 PM
The MiniDV spec allows for recording 4 channels. For our filming, we record the on-camera mic on stereo 1 and the wireless/external connections on stereo 2. What is the status of getting Vegas Video to capture the stereo 2 audio? This capability is a MUST for our use. Ideally, it would be great if it could capture both stereo 1 AND stereo 2 at the same time. The only other restriction is that the audio needs to come over the firewire connection - no need to lose quality running through multiple analog/digital converters.

Comments

Control_Z wrote on 4/8/2002, 7:04 PM
I doubt anyone at sofo is in this week, but if they answered at all they'd probably say we'll see it about the same time as heck freezes over.

Dunno why exactly, but I have yet to see an OHCI solution with channels 3&4. The newest beta SCLive will do them alone, but last I tried it had awful ticking in it.

If you're concerned with quality then don't use 32K audio in the first place. Until then you're simply going to have to get used to capturing them as a .wav file via analog as you capture the rest via 1394. I don't see any loss in quality, but it can sure be a royal pain to line them up. Especially when using scene detection and auto fades.
DougHamm wrote on 4/8/2002, 11:30 PM
CTRL-Z, which version of SCLive are you referring to? If it's a new beta, is it publically accessible? I've been a long-time fan of it but I hadn't seen any updates for months.

-Doug
kkolbo wrote on 4/9/2002, 9:23 AM
The only answerto lining up the audio is the way we still do it in flim and Jam synced multicamera video. The clap board is a great tool.
jetdv wrote on 4/9/2002, 10:50 AM
I currently use Cinestream for most of my editing and it can capture either Stereo 1 or Stereo 2. (Note, it can't do both at once but it CAN do either) Premiere and FCP can also capture either. SCLive can also capture either channel using the beta version located at http://www.scenalyzer.com/sclive20011115.zip but I have yet to find a way to get SCLive to let me capture a section using Stereo 1, the next section on Stereo 2, and then the next section back to Stereo 1 without a LOT of manual intervention. (I have not noticed the "popping" noise you refer to.)

I am just saying that for Vegas Video to be fully competitive, it also needs to be able to capture Stereo 2 over the firewire - just like the NLE's it is competing against. It doesn't have to capture both Stereo 1 and Stereo 2 at the same time but it DOES need to be able to capture Stereo 2. In fact, batch entries should have an indication for each segment which stereo track to capture. And, yes, for me this is a make or break issue! There is absolutely no reason why one should have to capture through a soundcard when the firewire connection is already available and connected.
Control_Z wrote on 4/9/2002, 7:15 PM
No way. Why stop there? If you're going to capture DV you should do it right. Not either but both. Our DVStorm has no trouble doing that.

I still don't see why our shooters need 4 channels but the only thing worse than using them would be for them to switch from one to the other constantly and expect me to have to set up batch captures that switch from one to the other. Besides, usually they have all 4 channels going at once anyway.
Control_Z wrote on 4/9/2002, 7:18 PM
>Premiere and FCP can also capture either

Really? Where's the option in Premiere 6?
jetdv wrote on 4/11/2002, 10:56 AM
Okay, it appears the extra channel options are part of the card/software combination of some cards. But, the bottom line is that EditDV/Cinestream has been able to do this with ease for over two years and Scenalyzer can also do it - just not quite as nicely as Cinestream. It can't be that difficult a task to add the option of choosing which stereo track to capture for each batch entry or straight capture.
jetdv wrote on 4/16/2002, 3:02 PM
Any comments from any Sonic employees on the feasibility of adding the ability to capture the second stereo track?
Luxo wrote on 4/17/2002, 3:49 AM
It's my understanding that the 1394 spec doesn't allow for both stereo 1 and 2 to be captured simultaneously. The reason DVStorm can do it is because it uses proprietary hardware. Since SF insists on being hardware agnostic, it's not likely we'll see the ability to capture both stereo 1 and 2 in one swoop, but there's no reason Vegas can't support the option to choose one or the other.

I asked about this option months ago on this forum and didn't receive any responses. Glad to see a thread about it. I use Canon XL1s cameras, and currently capture stereo 2 via my soundcard. It's satisfactory, but I know I'm losing fidelity and would much prefer a firewire option.

Any word SF? Am I correct about the 1394 specifications?

Luxo
jetdv wrote on 4/17/2002, 9:37 AM
Yes, that's all I'm asking for: the ability to capture EITHER stereo track. I don't need to capture BOTH at the same time - just the option to choose which one I need. We always record our wireless mics on Stereo 2 so that Stereo 1 can still be used for the on-camera mic. With Vegas, I currently have NO WAY to capture my wireless mics. We need the option to choose which stereo channel is desired.
HPV wrote on 4/17/2002, 8:50 PM
I guess a workaround would be to go analog in to your soundcard. Set output on camera via menu.

Craig H.
Control_Z wrote on 4/17/2002, 9:09 PM
>We always record our wireless mics on Stereo 2 so that Stereo 1 can still be used

Mix, mix, mix. Why leave it for post to mix this audio? Especially if there's a problem like a loose connector or interference. The shooters need good headphones and need to mix it all live to 1&2.

No argument with backup audio, but you can't record to the same miniDV and call it a backup. A good backup would be something like minidisc.

P.S. It's never been *my* understanding that the DV binary stream doesn't contain all the data available. If all 4 channels are there, then it's just a matter of decoding it properly. Our Storm doesn't get a different signal than the same machine via OHCI.
jetdv wrote on 4/18/2002, 9:33 AM
We don't want to mix live. Mixing live leaves too much room for error. I prefer the cameraperson to run the camera and only worry about framing and focusing. The sound gets mixed in post from the wireless system and two on-camera mics. Besides, you don't really know what kind of sound you will get from the various sources. Sometimes I take music from one of the on-camera mics. Sometimes it sounds better coming from the wireless. If I were to mix it live, I would not have as much flexibility in getting the RIGHT mix.

As stated before, I'm not asking the program to capture all 4 tracks at one time. I just want the option to be able to capture either (and, yes, I realize I may have to double capture some sections if I want the "other" track). I also don't want to capture the other tracks via a sound card. That just seems a little rediculous when the sound track is coming in over the firewire anyway.

Cinestream is a perfect example of how the stereo track options SHOULD work. Scenalyzer will also capture either stereo track but I can't selectively choose segments for each channel. For example, I will capture the on-camera mic until the bride & groom have entered, then I will capture the wireless mic for the bulk of the ceremony, and then switch back to the on-camera mic as the bridal party leaves. That is the reason why the stereo channel needs to be selectable on batch entries.
jetdv wrote on 4/29/2002, 11:28 AM
How about a comment from a sonic employee on the possibility of adding the ability to capture stereo 2?