How do you sync footage shot in 24p with audio recorded on a 25p camera?

H

Hutchman

Active member
Hey guys,

I live in PAL land and want to buy a gh2, but to get the maximum quality I can't shoot in 25p, but in 24p.

That's fine, but I only have recording devices (ie other cameras) like the DVX, but they're all PAL ie 25P.

So if I shoot on the gh2 24p and record my audio to my DVX at 25P, but I just want the audio not the video from it, will it sync up or is there something I have to do to sync it up properly?

THANKS
 
Hutchman said:
Hey guys,

I live in PAL land and want to buy a gh2, but to get the maximum quality I can't shoot in 25p, but in 24p.

That's fine, but I only have recording devices (ie other cameras) like the DVX, but they're all PAL ie 25P.

So if I shoot on the gh2 24p and record my audio to my DVX at 25P, but I just want the audio not the video from it, will it sync up or is there something I have to do to sync it up properly?

THANKS
Click to expand...

Set you camera to 48K audio sampling rate, if there's a setting option. And record. In your NLE unlock and deleted the video portion, and you should be left with, most likely, a stereo
audio pair. That should then be sync up with your 24p video as you would any other second system, with a mark from a clapper.

While the original video may be running at 24 fps, the audio is recorded at 48K (typically.), and so is really independent of the frame rate (other than perhaps using common timing circuits in the
camera...).

As with all things unknown... test... before a big shoot to verify you can perform this procedure flawlessly.
 
Why use a camera to record audio? IMHO that's a real kludge. Camera's have notoriously poor audio sections. Get an audio recorder, either buy or rent, and do the job properly. Always use the right tool for the job at hand.

j... is correct. Audio doesn't have a frame rate, it has a sample rate. So an audio file that was recorded for 1 second at 48kHz will play back in 1 sec if the playback sample rate is set to 48kHz, regardless of the frame rate of the timeline.
 
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Well, right tool aside (good advice BTW) audio is not recorded at a frame rate. So as long as you don't change the speed of your video your audio should be fine. You will have to strip the audio away from the video other wise it will be married to the video and it's frame rate and THAT could cause you to change speed.

But there is a catch. If your in PAL land are you planning to stay with 23.98 (24p - NTSC)? If you convert the 23.98 footage to 25 (PAL) it will change the speed and you will have a sync issue. Just changing the speed of the audio probably won't help since you are talking a quite noticeable change in speed (pitch). This last has nothing to do with what you record on so you should probably plan to shot at whatever frame rate you plan to finish in.
 
Steve House said:
Why use a camera to record audio? IMHO that's a real kludge. Camera's have notoriously poor audio sections. Get an audio recorder, either buy or rent, and do the job properly. Always use the right tool for the job at hand.

j... is correct. Audio doesn't have a frame rate, it has a sample rate. So an audio file that was recorded for 1 second at 48kHz will play back in 1 sec if the playback sample rate is set to 48kHz, regardless of the frame rate of the timeline.
Click to expand...

Before I got the H4 and the M-Audio devices, I had briefly considered using my DVX100 for a second system sound recording device... but 1) I hate tape... 2) I was able to sneak a few expenses under the WAR (Wife Accounting Radar), and was able to buy something that would be 1) better, for some value of better, 2) just easier to use.
 
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