Audio from SDI capture seems wrong?

farss wrote on 6/29/2005, 3:28 PM

OK, got Vegas to capture DB very nicely but the audio track is 16/48K. I'm reliably told that the DB tapes have audio at 24/48K. Furthermore the resulting audio track seems quite a bit down in level compared to what's on the tape as read by the decks meters. Normally I don't trust the meters on decks too much but given the apparent discrepancy in bit depth I'm getting nervous.
Bob.

Comments

winrockpost wrote on 6/29/2005, 4:02 PM

Farss, i wish i could help, watching your posts closely on the black magic card, cause I been putting off my purchase simply because I couldnt find much feedback , other than one vegas user.

Could the audio problem be related to the vegas meters versus the deck meters, analog/digital thing.

farss wrote on 6/29/2005, 4:37 PM

I'm not with the system at the moment but I don't think so, I'm reading the absolute levels from the file. I did capture a test tape but that was via the J30s downconvert to 1394. The reference tones read -20.0dBFS on the Vegas meters and you cannot ask for better than that. I'll try capturing the test tape via SDI and see what I get.
As a matter of interest the test tape was created straight from a TPG in 16:9 and recorded directly to DB, despite the downconvert to DV25 it looks AWESOME, we can still correctly resolve the finest graticle. This doesn't tell us anything about color sampling, just resolution but it does show that the biggest issue with DV as an acquistion format is the quality of lenses and CCDs and not the format. Bear in mind this is all PAL though and it is a static image that's mostly B&W.
I've captured a program as 4.2.2 from a 2nd generation production tape and I'm going to burn it to a DVD, I'll see how it looks, I suspect it's going to look impressive, which it should given the money that went into shooting it.
Bob.