Audio recording de-synchronized

[Danny Hays]

Are you recording the new audio track with the same sample rate that the video has? DV and HDV have 48k sample rate audio.

[Frederic Baumann]

Hi,

Thanks for your answer and for pointing this out.

So here are some info about my project:

Project properties for Audio : Stereo, 22050 Hz, 16 bits, resampling and stretching quality : Good

Recorded WAV files: 22050 Hz, 16 bit, Stereo.

Rendering: 128 Kbps, 22050 Hz, 16bit, Stereo, AAC

Would you have any idea to fix my problem?
Thanks in advance,
Frédéric

—
Want to learn on Sony Vegas Keyframes? Watch my video tutorial:
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French version:
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[John Rofrano]

It sounds like it might be a latency problem. What audio interface are you using? Does it have ASIO drivers? If it doesn’t have ASIO drivers you will not get a low latency recording and you will always have a delay from the time you think you recorded something to the time it actually got recorded. You can play around with buffer settings but the “real” fix is to invest in a good audio interface if you plan on recording real-time audio.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Frederic Baumann]

Hi John,

Thanks for your answer. I don’t know what is ASIO. I would guess Asynchronous S?? Input/Output.

And I don’t know how to know if I have ASIO or not. I had a look at the device manager of my PC, in the Audio, Video, Game controllers folder, but found nothing like ASIO.

My PC is a DELL Latitude E6400 laptop, and I am using the default sound card with the embedded microphone.

Later on, I plan to buy the Zoom H4n (to record audio along with my Canon EOS 7D). I have read it can also be used as a USB microphone. Do you think it would solve my latence problem described in this discussion?

Thanks,
Frédéric

—
Want to learn on Sony Vegas Keyframes? Watch my video tutorial:
https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.php

French version:
https://geo.creativecow.net/fr/a/12999

[Frederic Baumann]

Forgot one point. If the h4n does not make it, what would you recommend ? — knowing I am “on a budget”, as I believe you say in English.

Thanks again,
Frédéric

—
Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
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French version: https://geo.creativecow.net/fr/a/12999

[Frederic Baumann]

Sorry, me again. I have done something I should have done before writing the last 2 posts: looking for what ASIO is.

ASIO actually stands for Audio Stream Input/Output, and according to what I read, manages latency in a much more efficient way than the DirectAudio API does under Windows. I have found a free ASIO Driver, Asio4all (https://www.asio4all.com/). It seems to be the most commonly used, after the “KX” drivers, which only work for Sound Blaster cards.

It looks like I just have install it, and any ASIO-enabled application (including Vegas?) will use it to drive the audio peripherals like mikes and speakers.

I will install and test asap and will let you know what it gives – unless somebody else gives his feedback before here.

Frédéric

—
Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
https://library.creativecow.net/baumann_frederic/Sony-Vegas_event-pan-crop-tool/1

Or about Keyframes? https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.php

French version: https://geo.creativecow.net/fr/a/12999

[John Rofrano]

ASIO4ALL is the best approach since you are using a laptop without ASIO support. Sometimes it works and sometimes it doesn’t. Make sure in Vegas you go to Options | Preferences | Audio Devices and select the ASIO4ALL driver. Good luck,

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Frederic Baumann]

Hi, I have just installed the driver, and it seems to work fine:

– It appears and I can select it in the preferences
– I did a 30 second recording and even at the end there is no lag
– However, I cannot right now make a test with a video played while recording, which is the context in which I had the problem before. Maybe playing the video back loads the CPU in such a way that the sound gets lagged. So I cannot be certain that the problem is fixed right now, but it is in very good shape though.

I should be able to make the final test tomorrow or the day after, I will let you know.

Thanks very much once more John !!
Frédéric

—
Want to learn on Sony Vegas Event Pan/Crop tool? Watch my video tutorial:
https://library.creativecow.net/baumann_frederic/Sony-Vegas_event-pan-crop-tool/1

Or about Keyframes? https://library.creativecow.net/articles/baumann_frederic/Animating-with-Keyframes-in-Sony-Vegas.php

French version: https://geo.creativecow.net/fr/a/12999

[John Rofrano]

If you are narrating to the video, you can make the preview smaller to get better frame rates. Just resize it until you see the frames per second count stabilize at the frame rate of the video.

~jr

http://www.johnrofrano.com
http://www.vasst.com