24p in Magic Bullet Synching issues...

UncleBenji1977

UncleBenji1977

Well-known member
Ok, I'm still on my quest to make use of my non 24p cameras. Magic Bullet works very well in converting 60i into 24p except for one major issue. I import into premiere to find that the audio is out of synch. Is there a method to correct this? What's the best method? Thanks!
 
When you bring the footage back into premiere, is your timeline set to 24fps now?
 
Straight out of the manual:

To slow down your audio to match the 23.976 video, use an audio editing program to make the soundtrack 104.2709% of its original length, or a stretch factor of 2.042709. For programs that think in terms of speed, such as the Pitch n’ Time 2.0 plug-in for ProTools, the magic number is 95.904095904%. After Effects itself will do a remarkably good job of this stretch if you follow these instructions: Import your audio separately from your video. Place it in your 23.976fps comp. With your footage selected, reveal the tab for Stretch (or select Time Stretch... from the Layer Menu) and enter 104.2709%. Now from the Layer Menu select Enable Time Remapping. This last step is very important as it triggers After Effects to use a very high quality audio re-sampling technique.
 
Why wouldn't you just bring in the audio as a seperate element? If you clip is 5 seconds long, your audio is 5 seconds long. It shouldn't matter what the frame rate is. 60 fps , 235 fps, 12 fps, it shouldn't matter if all you are doing is altering the frame rate. The overall length of the video will remain the same, and the overal length of the audio will be the same.

Or, am I missing something incredibly obvious that will make me wanna hit my head with a brick?
 
Yeah. I used to think that Rapier, but in truth the deinterlacing actually does extent the clip causing the audio to bounce out of synch. I even tried dragging the audio in as a seperate element. Now, like I said before, DVFilm Maker does it automatically and does this quickly. I may have to break down and get that. I just wanted to find a solution with the NLE's I have now... Mainly Premiere and After FX. I haven't tried some of things mentioned here today, but I will when I leave work... Which is, right now. Adios!
 
Ok, tried to doing this in After FX. Didn't work. It actually caused the audio to repeat everything and it sounded like they were in a cave, but only it wasn't a cave. It was a robot's mouth! Craziness!
 
That's because in order to resample the time, you are going to have audio artifacts which will sound like time based effects like Echo/Delay, Chorus, Flange, and so on.

Send me the clip and I'll retime it for you. Just make sure you give me the EXACT time you need, to the frame, millisecond whatever. I'll send you back two or three mp3s and you can listen for yourself and decide which one sounds best.
 
I'll have to send it later. I'm at the office now, and it may be sometime. But honestly, I really would like to learn how to do this myself. I appreciate you wanting to help, but I guess I'm just missing some specifics when doing this.
 
UncleBenji1977 said:
I appreciate you wanting to help, but I guess I'm just missing some specifics when doing this.
Click to expand...


Not really, I just was lucky enough to start out doing small sound projects for 3D effect mini-movie makers online and learned quite a bit of the sound editing/design process. I am no Dave Fisk, and don't know the pre-end of it, but I can wrangle sound effects design pretty well, and have good working knowledge of lots of the more poular platforms for sound editing.

See if you can get a copy of Sound Forge. I personally like it the best for real sound twisting.

I can walk you through it, no problem.
 
Personally, I never render the sound when im going to bullet a shot, I bring it back into the editor afterward and do the sound mix. I've never had a problem with the audio being out of synch after I've adjusted the frame rate. Just a thought.

Mind you, it depends on the kind of footage you are editing. The stuff I was editing required a lot of mixing afterward. I do a lot of greenscreen shooting so most of the footage is dialogue only.
 
You must log in or register to reply here.
Back
Top