Re: Adding Audio over Original

Maverick wrote on 2/29/2004, 11:04 AM
Hi

For my parent's 50th DVD I am creating I have decided that, during the dancing, I don't really like the sound audio that originates from the camera of the music. As I have all the music that was played on CD I wondered about the benefits of using this instead and synchronising itusing the wave form.

There is very little spoken during this but some laufghter and such can be heard. Has anyone done the above and have any tips on how I can have the music from CD sound predominent but not lose the atmosphere from teh camera's audio. I am using 5.1 surround.

Cheers.

Comments

GaryKleiner wrote on 2/29/2004, 11:43 AM
You just have to find the right mix of the nat sound (from the camera) and the CD track by playing with their relative volumes.

You probably want to add just a bit from then CD to "sweeten" the orginal audio.

Gary
Maverick wrote on 2/29/2004, 11:50 AM
What I don't want is that effect you often get on the soaps where someone has a stereo on in the background but it's obvious the sound isn't comming from that. On the other hand I want to improve the poorer qulaity of the mamera audio.
ibliss wrote on 2/29/2004, 11:50 AM
As well as volumes, I'd strongly advise playing with the EQ on the camera's audio to help it sit 'behind' the real CD audio. With out hearing the two audio tracks it's difficult to give specific advice, but as an example you could take out a lot of the low end from the camera audio to avoid muddy bass whilst still leaving party abience and voices audible.
Maverick wrote on 2/29/2004, 1:32 PM
It seems I can't exactly line up the beat of the audio from the camera with the CD. I have zoomed in as far as I can go and each audio track will only move by one frame (PAL 25fps) at a time. This means that the two tracks are out by around 1/3rd of a frame. I cannot actually hear the delay but wondered whether there is a way of moving an event by much smaller amouns than 1 frame.

Cheers
Maverick wrote on 2/29/2004, 1:35 PM
Oops. Silly me. Turned of Quantize to frame and problem solved.

Thanls anyway:-)
Maverick wrote on 3/2/2004, 5:49 PM
Thought I'd let you all know how the audio overlay is working out...

It hasn't been easy to sync the audio totally as it seems that, even though both peices of music can start at the same time it appears that the audio from the camera can run slightly slower at times than the ripped CD stuff. I suppose this is more likely to be a fault with the DJ's turntable rather than at my end as other stuff I have tried seems to sync perfectly.

As I am working in 5.1 I decided not to use the LFE channel for the camera audio rather than use the EQ to filter out the lower frequencies.

I have also used the surround panner to move the camera audio which includes the atmospheric stuff like pople talking, singing, etc. to the rear leaving the CD audio nearer the front.

The final effect is pretty good, if I say so myself.

I think a little tweaking on the volumees to get it just right is still needed.

Out of interest, where the LFE is concerened, does each audio track have to have it's own related LFE track?

To make this clearer, I have used two audio tracks so I have better control over the fades between music tracks where they overlap but want to use just one LFE and let autocrossfades take care of things. Would this work properly. It seems to but I want to be sure.

Cheers all.