live video capture to vegas with 48k audio issues!

will-3 wrote on 3/25/2008, 4:55 PM
We just shot some video and captured it directly to Vegas 5 on an XP PC.

We used a Sony PD150 cam and had the audio mode on the cam set to fs48k... as opposed to fs32k.

Video fine... Audio has lits of click & glitch sounds...

We also captured on tape in the cam.

How can we fix this?

Can we save the live capture in the PC by making some changes in the Vegas audio settings?

If we recapture from the tap in the cam... the audio is on the tape at fs48k so will we have the same problem... or should we change some settings in Vegas then recapure from the tape?

We had changed this because Adobe Visual Communicator wants 488 or it records bad audio... didn't think it would be an issue in Vegas.

Thanks for all the help folks. You all have been very helpful!!!

Comments

Cheno wrote on 3/25/2008, 5:08 PM
Is the audio bad on the tape???

In the past, with Vegas 5 / 6 (don't see it with 7 or 8) I'd have weird issues on capturing in which the audio when capturing, sounded like it was distorted, same as you're describing. Not sure what it was but usually a reboot of the computer or even just Vegas took care of the problem and that it was something in live playback, but actual recording was fine.

farss wrote on 3/25/2008, 6:34 PM
Somewhat confused here.
DV Audio is 16bit 48Khz sampling OR 12 bit 32Khz sampling. Avoid the latter, it and Vegas aren't really the best of friends.

Your problem with clicks sounds like sample rate errors. What is your project audio set to, I think by default Vegas has it set to 44.1KHz, I could be wrong but you should check this.

Also are you capturing all the the A/V through firewire??
You're not feeding the audio into a sound card separately are you?

Bob.
will-3 wrote on 3/25/2008, 7:11 PM
Bob, we are capturing both audio and video direct to the PC via the Firewire. No other application was running.

We had captured live before but the cam was set to 32khz... as described in my begining post on this thread.

I just checked the live captured AVI file... clicking File - Properties
and I see the Audio is set to 44khz. Changing it to 48khz for the already captured AVI file didn't help so...

I have changed the Vegas 5 project settings for audio to 48khz. It was already at 16 bits so I left that alone.

Now I'm trying to the capture the clip directly from tape in the cam... the video was shot with 48khz audio setting in the cam... now I have Vegas 5 set to 48khz audio for the project... but still no workie...

Audio stutters and breaks and clicks...

Thanks for any more tips from anyone kind enough to offer a suggestion.

We really don't want to have to schedule a reshoot if we can avoid it.

Oh, When played in the cam the video and audio are fine.

Thanks.


Thanks for the help everybody 1
TGS wrote on 3/25/2008, 11:33 PM
My original PC, a P4, 2.4Ghz, with an Audigy Soundblaster, you could hardly understand the audio as it was captured. It was as you describe, Stutters, breaks and clicks. It sounded good on playback.
On my newer AMD 4200 2 x 64, using built in RealTek soundcard, it sounds good during capture and playback.
farss wrote on 3/26/2008, 12:12 AM
You'll probably find that as you capture, the audio sounds really bad, don't dispair. Just capture a short section first to see if I'm right here.
Once captured drop it onto the Vegas T/L. You should see Vegas build a proxy file for the audio. Now when you play it back it should be just fine.

Why does the audio sound bad as you capture?
Because coming down the firewire cable is 12/32K. Your sound card probably doesn't handle that and Vegas has better things to do than resample the audio while it's capturing. Once you finish capturing and put it on the T/L Vegas has plenty of time and will build a proxy.

Bob.
will-3 wrote on 3/26/2008, 5:35 AM
First we took the tape to another computer with Vegas on it and it captured both the video and audio fine... no problems... it seems.

This computer we have been using... the one giving us problems now... was capturing live from the cam to Vegas 5 fine until we did a Disk Defrag... (Windows XP system)

I think we are going to uninstall and reinstall Vegas on that system.

I don't know if this had anything to do with it but maybe when windows moved all the file segmets around it lost something... who knows.

I'll report back so the group knows the resolution to the problem... just in case anyone else has the same problem.

Anyone else had problems after a defrag?

baysidebas wrote on 3/26/2008, 5:55 AM
I've encountered such symptoms in the audio when other processes were vying for CPU cycles and disc access on a slower pc. Make sure that you don't have a background disc defrag operation or anti virus scan running while you're working the audio. Even on a fast pc they can bog down the system. Use the task manager to give you a picture of activity on your pc.
will-3 wrote on 3/26/2008, 6:40 AM
That is a good comment. In fact we brought up task manager to look at cpu usage... and it was running 80 to 90 %...

I discovered that I could move the mouse and create audio problems... as moving the mouse demanded some of the processor time.

This PC is a 2.19 GHz machine... only 512 of ram but it is running XP and has captured live from cam to Vegas fine until yesterday.

I'll report back on progress... other comments & suggestions are welcome.

Thanks.
will-3 wrote on 3/26/2008, 7:09 AM
We removed then reinstalled Vegas and that seems to have fixed the problem... capturing live from cam to Vegas and the audio & video seem fine... and we have the audio set at 48k.

We also closed the HP Update Agent application by turning it off in the Task Manager window... this was running before the reinstall of Vegas and the system was working fine... so I don't think this was the problem... I think something happened when we defrag'd the hard disk.

Whatever... it's working now !!!

This all created another question... unrelated...

When we reinstalled Vegas 5 we got a popup about accecpting the license agreement for Windows Transitions or something... we closed it too quickly and are not sure we 'accecpted the terms" or whatever... now we can't get that window to open again so we are not sure if we failed to activate some extra stuff in Vegas... maybe some freebee add-in's or something from Windows... Can anyone tell us how to get this option back up on the screen so we can see what it was... it occured right after we went through the registration screen for Vegas... and now we are wondering if we missed something. Thanks.
baysidebas wrote on 3/26/2008, 9:04 AM
Since defragging involves copying files, it is possible, even though unlikely, that a bit got flipped in the process, and borked up your Vegas files.
will-3 wrote on 3/27/2008, 7:31 AM
Must be true as Vegas seems to be working fine since we re-installed it.

Never had a defrag problem before... but maybe this was the first time.
Catwell wrote on 3/27/2008, 10:26 AM
I have the same problem at work although I am capturing with Scenalyzer. All I have to do to fix it is to turn off the anti virus. I don't like to do this so Instead I disable the network which disconnects my machine with the master AV program. We run a company wide AV with constant updates. I didn't have this problem before we installed the latest AV version.
will-3 wrote on 3/27/2008, 1:33 PM
Well, I did turn off the HP Automatic Updater application... which I saw running as an application in the Windows Task Manager window... I did that right after I reinstalled Vegas... but before I shot a test...

Next time I rebooth the machine (if ever :) I'll shoot a test with the updater still running in the background.

We don't have the computer on the network for the reason you mentioned and others... we just copy the work to a USB drive and take it to the workstation for editigng. $99 bucks at the office supply place got us a pocket sized 160 gb USB hard disk... great for moving video around from computer to computer... and doesn't clog up the network.