problem: echo using Video for Windows 720 x 480

[gharney]

Hello All,

I am wondering if you could help me with the following problem;

Premiere v 6x on Windows 2000 Pro.

Steps:

-Recorded 30 second clip from VHS to avi.
-Checked quality of AVI and found no problems.
-Opened up Premiere. New project and selected NTSC 720 x 480 Video For Windows.
-Imported AVI.
-Dragged to timeline.

When I play the clip there is an echo that is delayed by about 1-2 seconds.

If I bring up the audio mixer and mute the first channel, the echo goes away. However any audio effects are lost.

I do not have the echo problem when using NTSC 720 x 480 Quicktime.

I would be very grateful for any suggestions / help.

Thanks!
-Giles

 

[EdwardMartinIII]

Try interleaving your audio by 2 seconds.

What are all your project settings?

Because it works fine under some project settings, but not others, the problem is almost certainly in your settings.

Cheers,


Edward

"Cut a hole in the door. Hang a flap. Criminy, why didn't I think of this earlier?!" -- inventor of the cat door

 

[gharney]

Thanks for the reply Edward.

I will check the settings per your suggestion.

However the client has stated that prior to going to Windows 2000, everything worked using the steps I mentioned previously without any work arounds. Knowing them, they are going to say why do they need to do something extra.

I will check the settings though... If you have any additional suggestions I am all ears.

Thanks!

-Giles

 

[gharney]

Hi Edward,

Additional info;

OS is W2k Pro patched to SP3 (the latest) and has Direct X 9.

Video was captured to AVI using Rex Video version 2.63. There is a canopus external box that is between the VCR and PC.

The properties of the AVI are;

Audio Format: PCM
Avg Data Rate: 192 kb/s
Sample Rate: 48kHz
Sample Size: 16 bit
Channels: 2 (Stereo)

Video:
720 x 480 Pixels
Play Length: 43.944
Frame Count: 1317
Frame Rate: 29.971 frames / sec
Video Sample Size: 24bit
Video Compression: DVRex

After I start up Premiere I do;

File / New Project and select "NTSC 720 x 480 Video For Windows"

When "NTSC 720 x 480 Video For Windows" is selected the following settings are displayed;

Video Settings:
Compressor: Canopus DVRex Codec
Pixel Aspect Radio: D1/DV NTSC (0.9)
Frame Rate: 29.97
Depth: Millions, Quality 100%

Audio Settings:
Rate: 44100
Format: 16 - stereo
Compressor: Uncompressed

Rendering Options
Field Setting: Upper Field First

From there I do;

File / Import / File and select the AVI and click open.
I then drag the clip to Video 1A in the time line.

When I press play I get the echo.

Some additional findings;
Changing the interleave does not help.

If I were to open up Windows volume control and mute the Line In the echo is gone but the audio is off sync by about 1-2 seconds.

Likewise, if I were to disconnect the cable coming out of PCI canopus card that is going into the line in, the echo is gone but the audio is still not in sync.

Keeping in mind that this problem does not occur (even with line in unmuted or cable still plugged in) when using NTSC 720 x 480 Quicktime. (an option the client does not want to use).

Please let me know if I need clarify anything else...

Thanks again!

-Giles

 

[EdwardMartinIII]

(and people ask my why I don't upgrade my system in the middle of a project... )

I used to be able to run a mile in about seven minutes and there's no reason why I can't now -- except for that hide-a-bed accident that tore off my legs. But that shouldn't be an issue, right?

Changing the OS changes things and it may not be realistic to expect that certain applications won't occasionally require different settings to work in the same way. It is even possible that their previous settings only worked due to an error that the OS upgrade corrected!

Now, considering this OS change: If the box was a prefab of some kind (for example, a Compaq Presario 7994, which ships with Win98SE), it is entirely possible that the OS upgrade broke something that previously worked. My Microsoft Engineer friend, who has more than a decade of experience loading and tweaking Microsoft operating systems, still rolls her eyes and sighs heavily when I bring up the upgrading-her-Presario-to-Win2k story, which took her close to four months to finally get most everything working as well as before (the last thing she figured out was -- you guessed it -- the multimedia stuff, which was particularly recalcitrant).

My point, of course, is that changing the OS might be the problem.

But it might not. It certainly behooves you to pretend it isn't and look for settings that work, but you need to be aware, and your client should also be made aware, of that potential issue.

So, your clip settings...

Set your Project Settings to exactly the same as the clip settings, to the best of your ability. I mean everything, from audio rate to codec. Everything that is different is a potential for error.

Does the clip play in other (non-Quicktime) applications?

Have you tried other AVI compressors? Does this happen with all AVI codecs?

Cheers,


Edward

"Cut a hole in the door. Hang a flap. Criminy, why didn't I think of this earlier?!" -- inventor of the cat door