Export to Betacam via Decklink

Krzysztof wrote on 8/5/2005, 3:58 AM
Hi everybody!

Sorry for my poor english, but it's not my native language. :)

I'm new on this forum, but I worked with Vegas for a couple of years.
Now I've got some problem and maybe somebody can help me.
My work is postproduction (dubbing etc.).
When I was working with digital recorder (JVC HR-DVS2) via IEEE-1394DV card, every thing goes OK (capturing, printing to tape, view in external monitor). Sound was synchronized to video.
Two months ago I was buying a analog Betacam deck (UVW-1800) and Decklink SP card. Now I'm using them. In "external view mode" (from timeline) via Decklink syc. audio to video is more or less correct.
Sometimes.
More or less 6 frames (!).

But, when I'm printing..

Audio is totally unsynchro - 2 seconds early then video.

OK, let's try another way.
Because I'm working with sound only, I don't need to print bouth (audio and video), just it's enough to insert audio to video already existing on tape. I see that Vegas can use "edit mode". Wow, excellent!

But..

In "edit mode" (via Decklink of course) Vegas is inserting VIDEO only.
I don't see any reason for this. Who needs to insert video to audio???

At last, something about new driver to Decklink (ver. 5.1).
Blackmagic says that Decklink now can capture and playback AVI DV files.
It's not true. At least Control Deck can't do it. Control Deck send to recorder video in Blackmagic Quicktime format only. Any avi like DV, Sony YUV codec or else is not supported.

So, all I want to do is to export my final work to analog Betacam tape.
Maybe I do something wrong..
Maybe somebody can fix this problem? Thanks for every help!

Comments

farss wrote on 8/5/2005, 4:17 AM
Firstly remarkably enough you might get better help from the BMD forum over at COW.
If audio is 2 secs early so long as it's a fixed amount no panic, just offset the audio in Vegas by that amount. Also I think you can somewhere specify an offset.
As far as I know the only BMD drivers tested to work with Vegas is 4.8.1, 5.1 might be better or not, would be nice for the Sony team to keep those of us trying to work at the bleeding edge informed.
All that aside though if all you need to do is layoff your audio back to SP why not take a simpler approach?
I'm no expert on things analogue Beta as that kind of passed me by however I think the 1800 will restripe audio for you, you never need deal with the video side. You can capture it using any device such as the ADVC 100, qulaity doesn't matter as it's never going back to tape!
Have the deck also burn in time code as you capture, that way you know exactly where you are without doubt.
Now to get your audio back to tape you need to get TC out of Vegas to slave the deck, there's a converter that'll convert MTC to VTC or LTC that the deck can slave to. Then you take the audio from a decent soundcard into the analogue inputs of the deck. Job done without having to handle the vision that's on the tape.
Hope I've managed to understand your problem fully, if not some of my advice could be way off.
Bob.