Comments

Sol M. wrote on 4/20/2003, 3:44 AM
Basically, when shooting the MV, they play the music that the performer needs to lipsync to at a faster than normal rate. For instance, if you're going to cut the speed of video in half, the music at the time of shooting would be played 2x normal speed.
Finatic13 wrote on 4/20/2003, 4:19 AM
thanks, the most effective are always the simplest i guess
next question is, can this be reproduced in Vegas if the footage has alreadt been recorded as normal?
thanks
si
Terry25 wrote on 4/20/2003, 5:53 AM
No.

But you could consider cutting it up into small pieces(like every second or two) and then morphing these bits into each other. It would take awhile to complete but it would slow the motion, make it look weird and still keep it in sync (assuming you lock it down as you cut). Or you could make two copies of the clip, slow one down and make a mask to fit around the mouths from the normal speed one. Might be a bit cheesy though.

On a related bit, there's a funny moment in a Radiohead documentary (I think its called Meeting People is easy) where they show a clip of them making a video that does just what your talking about. Its a one shot video has the lead singer in a deep diver mask that slowly fills up with water. When the water covers his nose they speed up the music he's lip synching to Even so by the time the song is over he's gasping for air and looks like he's about to faint. They do several takes.
Finatic13 wrote on 4/20/2003, 6:01 AM
i vaguely remember that video will watch out for it when i see it again.
regards
si
Sol M. wrote on 4/20/2003, 10:39 PM
As Terry25 said, you can't slow down footage and expect it still sync-up.
So it depends how good you want the video to look. One of the main characteristics that differentiates an amerateur MV and a "pro" MV is whether it "looks like they're really singing".

I've seen many many bad MV for local artists, and almost none sync-up correctly. Slow mo may be a cool effect, but the detrimental effects of doing so may outway the advantages.
SonyDennis wrote on 4/20/2003, 11:48 PM
You might try the "undersample rate" video event property to see if it does what you want.
///d@
stormstereo wrote on 4/21/2003, 4:05 AM
I copied the Q & A-text frome somewhere else. And speeding up audio with exact control is easy in Sound Forge. Then burn it to a playback CD for the video shoot. Then slow down your recorded video by percent in Vegas, making sure you use the formula below. Done.
Best/Tommy

Q: Hello everyone. A friend and I are shooting a music video for a local group. We want to do an effect where everything is in slow motion, but the audio is all normal speed, and the lip synch matches the audio. We've been doing some experiments where we have sped up the audio and recorded ourselves lip singing to this sped up up audio. When we import the footage, we replace the sped up audio with the normal speed audio and we slow down the video to match it up. This seems to schieve the effect we want. My question is: How do I know how much I need to slow down the video to match the audio. Example: We speed up the audio 60%, and record ourselves. How much do we have to slow down the footage in order for it to match the NORMAL speed audio. Right now we are guessing, but there should be a mathmatical way of figuring it out precisely. Any help will be appreciated. Sorry for the long post!

A: You're right - there is a mathematical formula. :-) You need to calculate the
'inverse' of the increase. If you speeded up the audio by 60%, then you are currently at 160% of 'normal' speed. The corresponding adjustment to slow down is 100%/160%, or 62.5%. You can check this mathematically: 160% * 62.5% = 100%. Many people make the mistake of saying that if you were originally 60% faster, then the correction is to go 60% slower - ie 40%. As you can see from the above, this is not correct. Use the formula above and you should be OK.

Just to be clear, the new playback rate needs to be set to 62.5%.

Mark