Capturing... What In The World Went So Wrong???

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 1:13 am

This was my first capturing session; it was a disaster!!!

I am capturing from a Canon Elura 65 DV Camcorder...

I set the capture options as follows:

Fomat For Capture - DV

Went with all of the UVS defaults...

Used the "Split By Scene" function...

Capturing a one hour video with different scenes...

The results were...

The video was perfect... No problems

The audio was the strangest thing I have heard...

First, the audio was about two times fater than the video, the audio file was finished before the clips reached the middle portion. It sounded almost like a 45rpm played at 78rpm! (Remember Records)

Second, when eyeing the video and audio files, the audio file was about 1/3 the size of the audio file...

What in the world went wrong???

Any help... PLEASE!!!

THoff · Post by **THoff** » Fri Mar 25, 2005 1:29 am

I suspect that your audio was recorded at 12-bit instead of the standard 16-bit DV audio resolution.

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 1:38 am

Audio was set at 16 bit...

Made sure of that because I was recording myself singing...

THoff · Post by **THoff** » Fri Mar 25, 2005 2:28 am

When you say it was set for 16-bit audio, can you confirm that that setting was in effect at the time the video was filmed, or did you switch to 16-bit audio after filming but prior to the transfer expecting to get a 16-bit audio DV file?

Try capturing a short segment of video from that tape using WinDV and try playing the resulting AVI file using Windows Media Player. If that plays correctly, launch UVS, select the file in the File Open dialog, and inspect the file's audio and video properties and double-check that the information shown indicates 16-bit audio.

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 2:39 am

Hi THoff,

Thanks for your replies and your help.

I can confirm I taped in 16 bit, because I just got my Canon Elura,
and changed the audio setting just prior to taping. The Elura defaults
to 12 bit audio with windscreen. I changed the settign to 16 bit audio,
no windscreen. The confirmed setting was on the LCD while taping,
so I would think it recorded in 16 bit audio.

Will have to try you suggestion with the files...

I am baffled by this...

kebrinton · Post by **kebrinton** » Fri Mar 25, 2005 5:22 am

Okay. And you were capturing as Type 1, not as Type 2 which splits audio from video tracks -- right?

That would be my next question.

maddrummer3301 · Post by **maddrummer3301** » Fri Mar 25, 2005 5:48 am

Hi,
Many times if you start capturing from the absolute beginning of the tape
the program writes the audio stream information incorrectly.

Right click on the video. If it's playing twice as fast somehow ulead
is sampling it at 48khz but it's in the file at a lower rate.
It sounds like the audio in your Dv.avi file is 32khz and ulead is
sampling it at 48khz. This will cause the chipmunks to come out.
If you start from the absolute beginning of the tape from a new session
record a short segment and check the audio properties. They should be
16 bit 48khz. If you recorded the tape as 16bit that is the only correct
setting that should be read. If the file displays 16bit 32khz then that is
incorrect. Or, 12bit 48khz would also be incorrect.

I usually have to run the tape approx 10seconds into the video, then
hit the record icon. Otherwise the wrong audio properties are encoded
in the file.
This is a function of your camcorder. The dv stream defaults to 32khz
and transmitts that before tranmitting the actualy video. Ulead reads that
incorrect data and stays with it.
Similar to recording a dv.avi in 32khz then the next linked recording is
48khz on the tape. If you ever do that watch out. You will have to
split the dv.avi to record it properly unless the program can pick that up
and start another dv.avi file with the different audio spec's.

I have fixed some avi files by exporting the audio and re-sampling to
48khz, then re-importing the audio back into the video editor.

Hope this helps,

MD

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 9:42 am

First, in reply to kebrinton, I used Type 2 when Capturing my video...

MadDrummer has however solved my problem! Thank you!
You have hit the proverbial nail on the head! THoff was also right in there with the correct diagnosis too!

When seriously checking my recorded video, and thinking back to the taping session, I do remember that the very first take, about 30 seconds of the tape, was recorded with the 12bit audio option. Only in the second scene did I change the audio to 16 bit! I started my capture session from the very beginning of my tape! Now I know that UVS had set the capture settings for 12 bit audio! I would have never figured this out on my own! Thank you so much Maddrummer, for your very accurate reading of my problem, and for solving it for me!

THoff also eluded to the same problem, by suggesting that my audio was recorded in 12 bit mode.

This group has some of the most helpful folks I've encountered on the net, and I am grateful to all for your help in solving this problem for me.

In closing this out, does that mean that it is NOT possible to use 12bit audio when editing in UVS 8?

jchunter · Post by **jchunter** » Fri Mar 25, 2005 2:28 pm

Ray,
I hate to be a nag on this point but the Recommended Procedure (top post) was written to help users avoid problems such as you are experiencing (e.g., it recommends capturing in Type I DV). There are many more pitfalls on the way to a perfect DVD, so I suggest you follow it to the letter - at least at first.

)
John

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 6:38 pm

Hi jchunter

Thanks for pointing that out to me...

I must confess, in all honesty, I did NOT read that post.
I have read it now, on your reccomendation, and will do
as you suggest, to "follow it to the letter..."

That is some good advice, and advice is what I need.
Had I of read that post I could have saved myself a lot of frustration.

Thanks for your note...

Post by **Ken Berry** » Fri Mar 25, 2005 9:54 pm

As to your question about 12 bit, I am here to tell you that you can in fact still use video filmed in 12 bit. I did so with absolutely no problems in producing a usable VCD or SVCD back in the bad old days when I first started editing my own videos (and didn't have a DVD burner). It was only after joining this forum that I realised a couple of years ago that I needed to change my camera setting to 16 bit.

But essentially, the only difference is that 16 bit/48 MHz gives you much better quality.

Ray Musicbear · Post by **Ray Musicbear** » Fri Mar 25, 2005 10:10 pm

Thanks for your reply, Ken.

I too have a couple of videos I shot in 12 bit, I was thinking of maybe doing some editing on them in UVS. The only reason I shot them in 12 bit was because I wanted to add some narration to the tracks later, and that is the only way I could add narration, according to my old camcorder's manual. Now, since I've met UVS, I know I can do that in the program too!

Thanks to your post, I feel more confident in going ahead with the
editing process.

Thanks again.

THoff · Post by **THoff** » Fri Mar 25, 2005 10:41 pm

The other thing worth mentioning is that using 12-bit audio instead of 16-bit audio saves you absolutely no space on your camcorder's tape, since the total storage set aside for audio is fixed.

Camcorders use 12-bit audio to create a separate voiceover track, or in some cases in conjunction with a special microphone for four-channel (surround) sound.

I rarely use voiceovers/narration, but I think doing it during editing is a better time to do it -- you have more control over the environment (no background noise, hopefully), and you can review the video and make notes (providing a better narration). Last but not least, many camcorders turn off the internal mike during the narration, so you lose the audio of the event you are filming while you are pressing the microphone button, even while you are taking a breath.