GH2 Syncing problem

[jimmiesner]

Normally i sync my GH2s in premiere with plural eyes. One of the cameras has no audio so i am trying to sync manually.

Problem is it seems to get out of sync quickly. I havent had this problem before and am actually pretty good at manually syncing. (Cameras are same frame rate) Im stumped though anyone else have this problem?

 

[stoneinapond]

Audio sample rate issue (44.1 vs 48)?

 

[jimmiesner]

No, it's all 48.

 

[Thomas Smet]

Are there dropped frames in the video? A few dropped frames can throw everything off.

 

[jimmiesner]

Ok, so i sped the clips without audio to 125% and they match up perfectly (no drift over an hour). Why would the GH2 losing audio cause this?

 

[Thomas Smet]

Are you sure the other camera didn't shoot 30p? Speeding up a 30p clip by 125% would give you 24p. If you are sure it was shot 24p perhaps your NLE is assuming it is 30p and shifting it.

What NLE are you using?

 

[Jim Simon]

Speeding up a 30p clip by 125% would give you 24p.

I think you got that backwards.

 

[DrDave]

Some hacks affect the audio sync. Some don't.

 

[jimmiesner]

Everything was shot in 24p, and the computer recognizes it as such. The hack I used is Cake. I'm curious if further testing with this hack (with a disabled mic) would reveal similiar results.

Jim