32K Audio Captured Instead Of 48K

Ron Lucas wrote on 3/15/2002, 7:45 AM
More info on my problem with 32K audio being captured instead of 48K...

I have two computers (1 Dell and 1 Compaq). The Dell has an Adaptec 1394 card and the Compaq has a built in 1394 port. I have two Canon XL1s cameras both configured for 16bit audio which means 48K audio too. On both computers, if I use VV3a's capture utility, all of my video clips show up with 32K for the audio properties when they should be 48K.

Next, I downloaded and installed the demo for Scenalyzer (www.scenalyzer.com). This is a capture utility similar to the one in VV3a. On both computers, the same footage I captured using VV3a's capture utility comes in a 48K using Scenalyzer.

So, it appears to me there is not a problem with my cameras or my computer setup. It seems that if one capture utility (Scenalyzer) can capture correctly, then something must be wrong with VV3a's capture utility. I know everyone does have have this problem, but I have heard from some other people who do have this same problem.

I don't know if the audio captured using VV3a is really 32K or 48K. Maybe the problem it is just in the header information VV3a's capture utility puts on the file and can be an easy fix.

Sonic Foundry, do you have any suggestions?

Thanks,
Ron

Comments

SonyEPM wrote on 3/15/2002, 9:52 AM
We're keeping an eye on this. It seems to be a Canon only thing. I was seeing this same 16/32 thing as you (with a GL-1) a couple of months ago, but despite many attempts, I cannot get it to happen again on the exact same machine.

Once we get a solid repro in house, we'll post the fix. In the interim, I hope you can work with the files- they seem to sound ok, no?

Ron Lucas wrote on 3/15/2002, 10:34 AM
I think the audio may be ok. I haven't spent time comparing the footage captured with VV3a vs Scenalyzer. I'll try to do that this weekend. The reason I've discovered this is because some of my clips captured do not have the same length for video and audio. This seems to be causing a problem when I drag the end point of a video clip and the audio does not move with it. Some of my video clips have the same video and audio length properties and they work fine. But many clips I capture with VV3a have different video and audio length properties. It all cases, the video length is a bit shorter than the audio. They are not off by much, and the video and audio stay in sync, but the end points don't line up.

The only way I can get around the problem is to move the end point of the audio portion of the clip back to line up with the video. Then, all of a sudden, when I start dragging the end point of the video, the audio will lock with it.

I never noticed this before the 3.0a patch, but then again, I haven't capture much video before either.

Ron
haydenj wrote on 3/16/2002, 9:16 AM
Ron, as you know that I am having the same issue on my Canon Zr20 camcorder it will cature at 32kHz 16bit instead of 48kHz 16 bit. This happens on the older version of 3.0 as well with the newer version 3.0a of Vegas Video . One time I was able to capture 48kHz 16bit on one tape but I was not able to repeat this feat. I did try another capture program I found on the web AVIO and it was able to capture at 48kHz 16bit. The AVIO program while it did work ran like a slug which tells me that there may be some communication issues. I am using a Intel 850GB motherboard with a 1.5gHz P4. The firewire card has a standard TI controller. This is a different firewire card from yours. I did some searches on the web and found that 32kHz 16bit is common with camcorders if you are using LP instead of SP on the camcorder but this is not my issue. Since I do record classical music on tape with a external mics since the built-in mics on the ZR20 are not very good I would like this issue to be resolved. I will run a few more tests to see if I can pinpoint what the problem is.
SonyEPM wrote on 3/18/2002, 10:05 AM
Is the audio pitch of these 16/32 files incorrect (sounds like mickey mouse, or the devil)? If it sounds ok pitch-wise, it should be fine for editing.

We are aware of this capture problem and will try to get in a fix in a future update.
Cheesehole wrote on 3/19/2002, 12:19 AM
>We are aware of this capture problem and will try to get in a fix in a future update.

I have just captured footage from my Canon GL-1 and the audio is showing 32K instead of 48K. I tried to capture again, and it came across at 48K. hope it gets fixed... thanks.
Ron Lucas wrote on 3/19/2002, 8:53 AM
When my video clips do not have the video and audio length the same (the audio is always a bit longer), the audio sounds fine until the very last second or two of the clip when it slows down and sounds like the devil! Other than the end of the audio clips in this case, pitch is ok. I can't tell if the audio is truly 32K or 48K even though VV30a says 32K.

Any ideas on why my imported clips are coming in with the video and audio lengths not the same? Not all of them, but most of them. Again, the audio is always a bit longer. And I can't grab the end point of the video portion of the clip and move it left while keeping the audio 'locked' with it. I must move the end point of the audio portion of the clip left a bit to line up with the video first, then I can begin to move either the video or audio portion of the clip and they stay locked together.

Thanks,
Ron
haydenj wrote on 3/19/2002, 2:50 PM
On my Canon ZR20 when I capture short clips I can get 48k 16bit audio to show up, sometimes. On longer clips just the 32kHz 16bit under audio will show up. The pitch will usually be fine.