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Lip Movement vs. Slate?
Hello,
Thank you to those who helped with my previous question.
So I am now syncing up audio / video clips in the timeline, working with an assistant.
Something I would like to understand better is this: does syncing clips ALWAYS begin as soon as the slate touches down? Or are there times where the audio needs to be adjusted by a frame (or two or three) to match the actor’s lip movement?
Is it purely a technical issue of syncing the slate, or does one always have to “eyeball” it by looking at the lip movement? (I have heard that sound does not have any delay unless it travels more than 47 feet…)
Thank you.
Diane -
13 Replies
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What format are you working in?
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The whole point of the slate is to give you a sync point. So to not use it and instead wait until sometime after seems rather odd. Don’t trust your audio recording device?
Shane
GETTING ORGANIZED WITH FINAL CUT PRO DVD…don’t miss it.
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Well, in that case your audio engineer can slip sync by half a frame…or you can do it in FCP too.
Shane
GETTING ORGANIZED WITH FINAL CUT PRO DVD…don’t miss it.
Read my blog, Little Frog in High Def -
more info is needed. Are you syncing video to a separate audio recording? Or is one camera used as the master audio? How are you monitoring video and audio? Is your timeline fully rendered, if it is kicking into RT playback it does so my dropping frames and quality not good if you are checking sync.
But as the others if you have a slate that is always the best thing to sync cameras and audio.
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Hi,
DVCProHD (P2 .mxf) that was automatically ingested as .mov during capture / HD 720×24 / Final Cut Pro latest version(Boom Audio in separate files/folder)
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Not sure; sometimes the slate sync point /audio seems to split across two frames —
and sometimes the syncing looks slightly off as the actors speak, even if the syncing on the slate seems right on -
[Diane Angel] ” I have heard that sound does not have any delay unless it travels more than 47 feet…”
As the speed of sound is 1125 feet per second it travels approximately 47 ft during 1/24th of a second. So if you are shooting at 24fps and the distance from slate to mic is less than 47 ft the sound of the slate should theoretically match to the frame where the slate is closed. But, as the slate may be closed at any time during the exposure of the frame or even between exposures there is always a possibility that a frame before or after may look more in sync.
Also if your talent is farther away than 47 ft and your slate is closer then you could have the situation where it is more visually pleasing to have the sound offset by a frame even though it would be technically incorrect. In the real world you would see a person talking 1/24th of a second out of sync if they were 47ft from you. But your brain probably wouldn’t notice it.
But the general rule is that you shoud sync on the frame where the slate is closed. Two or tree frames off seem a bit much. Assuming that your equipment is working correctly, both for recording and the editing setup where you play back and check the synced sound.
Stephan
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Shift by half a frame? May I ask how to do that?
Thank you -
Thank you!
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How are you monitoring? If you are monitoring your audio via a firewire device or some other device and monitoring picture in the FCP Canvas then your picture and audio will appear to be @ 4 frames due to a playback offset that is default in FCP.
To correct, monitor Picture and Audio through the same pipeline. If Firewire D to A, then monitor both via that. If through a PCI capture card, monitor both to that.
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