Lip Syncing In Slow-motion - Formula

OK, so what would the formula be to shoot slow motion on a DVX100A at 60i? I'm shooting at 60i and slowing it down to 40% in Vegas in a 24P project. How much should the audio track be sped up to shoot?
 
24/60= 0.4 (40% speed)
60/24= 2.5 (2.5 times faster recording)

This works for any speed, just plug in the variables.
 
But you have to know what the actual speeds are. It's okay for 60, 24, and 30, but it doesn't work for any other speed because the actual speeds y don't match the nominal speed.
 
Hello, first time poster here.

I'm pitching a music video and I want to do the shooting in slow motion but at sync.

I've had a look about the web and I can see the specs for 24fps, 23.98 fps, and several others, but I want to shoot 60 fps on a 25fps editing timebase.

does anyone know what the calculation would be? I'm thinking the song needs cranking 240% with corrected pitch, but I'm really not sure and I can't risk getting this wrong.

Best



James
 
Hello, first time poster here.

I'm pitching a music video and I want to do the shooting in slow motion but at sync.

I've had a look about the web and I can see the specs for 24fps, 23.98
fps, and several others, but I want to shoot 60 fps on a 25fps editing
timebase.

does anyone know what the calculation would be? I'm thinking the song
needs cranking 240% with corrected pitch, but I'm really not sure and I
can't risk getting this wrong.

Best

James
 
Do the math, get sample values, and then test the shooting and post before you even get near the talent
 
Barry- I might be missing something, but on this post you have NTSC 48 fps: "make song last 0.498x as long as normal; play it at 200.80% speed" yet in your AF100 book
you have the 48 fps numbers as 0.504x and 198.28%- which is correct?
 
This post was only for the HVX200. The AF100 has different frame speeds, so the chart in the AF100 book is correct for an AF100.
 
How did you compensate for the extreme pitch change during playback. Is there a specific software or technique you need to do after speeding up the track?
 
I think you missed the point of the post. There is no pitch change to compensate for, because the goal is to use the audio as it was originally intended -- you speed up the audio and have the actor perform very quickly (sync'ing to the sped-up audio), and you film it in slow motion, such that when you play the slow-mo footage back, it exactly matches the original audio. You don't use the fast audio for anything other than as a reference point for the actor/singer to perform along to. You use the original audio at its original 100% rate in the actual edit.
 
You must log in or register to reply here.
Back
Top