getting the music video effect

Jaimebailon

Jaimebailon

Well-known member
so ive been trying to get the effect that music videos have when they are slowed down or sped up and the lips are in perfect sync i wanted to see if anybody knew the speed the songs have to be at for

24pa

30p

60i

-Jaime Bailon
 
I think the OP is asking how fast/slow should the audio/music be playing when recording in order to slow/speed up the footage to sync the talent's mouth with it all. Think of all the slow'motion J'Lo videos or Linkin Park's in the End. It's a good question, but I have no clue how it's done.
 
Not sure how this would be done on a DVX. I saw an MTV "making the video" a few years ago and they explained it a bit.

To slow down the action: During the shoot, speed the audio play-back up as well as the cameras frame rate. The musicians will be playing/lip syncing faster than normal. When in post, just slow the footage down.
 
Hi,
I saw some time ago a cool video demonstrating that effect. You can see that and many more on Digital Juice page. Direct link to that video should be here.
Anyway the episode is called "[FONT=Verdana, Arial, Helvetica, sans-serif]The Need for Speed" from [/FONT][FONT=Verdana, Arial, Helvetica, sans-serif]Perry Jenkins dated May 24th 2007.
They have good stuff :)
CIAO
CIPO

[/FONT]
 
Traditionally you would speed the music up to 150% or even 200%. Shooting film you would then shoot at 36fps or 48 fps respectively. As the DVX lacks var frame rates in this sense, you can slow the image down in post by either 50% or 100% to sync up the image to the music played back at the proper speed.
This should work.
 
Copy/Paste of Barry's post:

The problem with giving exact answers is that the frame rates aren't exact, so even if someone comes in with the magic formula it'll still have to be tested to be sure.

But, with that said, the basic formula is that you first want to determine your footage playback speed, and once you know that, it tells you how to modify the song. So (in theory) if you're wanting to shoot 48fps slow motion for a 24fps timeline, you'd be getting 2:1 slow motion, so you'd have to speed up the song so that it plays for exactly half as much time as normal.

So again, in theory, you'd take a four-minute song and speed it up so that it plays for exactly two minutes. Then you'd set the HVX into 24pN mode, set your frame rate to 48, and play the sped-up song and have your actor/singer lip-sync to the super-fast version of the song. Then when you play your footage back it'll be in 2:1 slow motion, and you'd marry that version of the footage to your original song, and they should now be in perfect sync.

But they won't be. Because there's theory, and there's this troubling thing called "reality," and the reality here is that the frame rates are not what they say they are. 24fps is not, for example, 24fps; it's 23.976. And 48fps is not 48, nor is it 47.952 (as you might think, if it's twice as fast as 23.976)! It isn't. It's actually 48.17. And 12fps isn't 11.988, it's 12.26. Except if you're on the PAL HVX, where it actually is 12.500, half of 25.000.

So you need to adapt the formula to comply to the actual frame rates. Fortunately the HVX does part of that work for you, by doing the 24pN (or 25pN) conversion in-camera, so we only have to concern ourselves with how much to speed up the song by.

I haven't tested these, but I'd guess they're accurate; if anyone tests them and finds them inaccurate please let us know.

For an NTSC/US HVX, using a 24p timebase, for the following frame rates, adjust the song speed to:

12 fps: make song last 1.956x longer by stretching it to 51.1% speed
18 fps: make song last 1.333x longer by stretching it to 75.0% speed
20 fps: make song last 1.226x longer by stretching it to 81.6% speed
22 fps: make song last 1.067x longer by stretching it to 93.7% speed
26 fps: make song last 0.907x as long as normal; play it at 110.25% speed
30 fps: make song last 0.800x as long as normal; play it at 125% speed
32 fps: make song last 0.747x as long as normal; play it at 133.87% speed
36 fps: make song last 0.672x as long as normal; play it at 148.81% speed
48 fps: make song last 0.498x as long as normal; play it at 200.80% speed
60 fps: make song last 0.400x as long as normal; play it at 250.00% speed

For an NTSC/US HVX, using a 30p timebase, for the following frame rates, adjust the song speed to:

12 fps: make song last 2.445x longer by stretching it to 40.91% speed
18 fps: make song last 1.667x longer by stretching it to 60.00% speed
20 fps: make song last 1.533x longer by stretching it to 65.23% speed
22 fps: make song last 1.333x longer by stretching it to 75.01% speed
24 fps: make song last 1.250x as long as normal; play it at 80.00% speed
26 fps: make song last 1.134x as long as normal; play it at 88.22% speed
32 fps: make song last 0.933x as long as normal; play it at 107.14% speed
36 fps: make song last 0.840x as long as normal; play it at 119.05% speed
48 fps: make song last 0.622x as long as normal; play it at 160.73% speed
60 fps: make song last 0.500x as long as normal; play it at 200.00% speed

For the Euro/PAL camera it's different; the timebase of PAL footage is 25.000 fps, so that makes it easier. But the other frame rates may vary, so it needs some calculation too.

For the PAL/EU/AUS/NZ cam, set the recording mode to 720/25pN, then set your frame rate to whichever your chosen fps is. Then adjust the speed of the song according to this table:

12 fps: make song last 2.000x as long as normal; play it at 50.00% speed
18 fps: make song last 1.400x as long as normal; play it at 71.44% speed
20 fps: make song last 1.266x as long as normal; play it at 78.96% speed
23 fps: make song last 1.080x as long as normal; play it at 92.60% speed
27 fps: make song last 0.920x as long as normal; play it at 108.68% speed
30 fps: make song last 0.840x as long as normal; play it at 119.04% speed
32 fps: make song last 0.778x as long as normal; play it at 128.56% speed
37 fps: make song last 0.680x as long as normal; play it at 147.04% speed
48 fps: make song last 0.520x as long as normal; play it at 192.32% speed
50 fps: make song last 0.500x as long as normal; play it at 200.00% speed
 
sped up song too fast

sped up song too fast

Hello everyone. Interesting post but I didn't find the answer to my own troubles.

I am shooting a music video on Monday, the artist wants that slow mo playback effect.

I have the choice between using the 5d and the sony ex3.

So I will go for the ex3 which can shoot in 60fps or 50fps.

Final output is 25fps (I'm in France).

I speeded up the song 200% so that I can do a 50% speed change and have my slow-mo twice longer than normal (per the chart in this post).

However, the song is now waaaay to fast for the artist to be able to sing it.

I would like to compromise and speed up the song to only 150%, so that I just change my 50fps clips speed to 75%.

Would that work? It would mean 32,5 frames to dispatch on a 25fps sequence.

I am not sure I wont get that horrible jitter I am trying to avoid or mess up lip sync.

Thanks for your help.
 
FWIW, I've done the opposite effect, which gives a comedic look. I pre-recorded dialogue and slowed it to half speed. Next, had actors lip-sync to the slow audio. In post, I doubled the speed of the video, an synced it with the original dialogue recording. This can also be used with music to make coreography look unusually snappy.
 
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