Latest post Sat, Jun 17 2006 9:25 PM by RTG23. 4 replies.
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  • Sat, Jun 17 2006 9:47 AM

    • RTG23
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    • Joined on Thu, Oct 13 2005
    • Los Angeles
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    Sync 48k Sound Track to 24p Project?

    I'm working on a music video shot on a panasonic camera at 24p standard.  I'm working on a Mac G5 Dual Processor 10.4.2 OS, 2 g Ram.  AXP 4.8.2.  with original Mojo.  I originally digitized into 30i project before I realized it was shot 24p in panasonic camera.  Picture looks fine in AXP, but band performance has to sync to 48k music track that I import.  My problem is that picture (band performance) slips out of sync with music track because of pulldown issues often discussed in other posts.  If I re-digitize into a 24p project, will this fix my problem?  Will my picture sync to my music track without any further settings changes?  And what will that mean to me in terms of resolution?  If I digitize component or composite, will I be able to do 1:1 resolution?  Or am I stuck with 28:1?  I have less than 6 days to complete this music video, which has 3 hours of footage for a 4 and a half minute video.  So there's a lot of work to do in short time, and I have to re-dig (I think?).  I know this relates to previous posts but I couldn't find any targeting the issue of syncing an imported music track to digitized 24p footage.  Any ideas for me?  Can I make my current 30i project work?  Any workarounds to make my music track sync to 24p footage digitized into 30i project?

    Thanks in advance,

    Rick
    Power Mac G5 Dual 2.0 GHz 2 gig ram OS 10.4.2 250 Gig Internal HD Avid Xpress Pro 4.8.1 Q.T. 7.0.3 [view my complete system specs]
  • Sat, Jun 17 2006 5:38 PM In reply to

    • RTG23
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    • Joined on Thu, Oct 13 2005
    • Los Angeles
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    Re: Sync 48k Sound Track to 24p Project?

    I was hoping to see some replies to my question when I logged on this morning.  Just to be clear, I'm having trouble syncing the music track to the singer singing to playback on set.  After sleeping on it, I'm wondering if working in a 23.976 project would do anything for me?  Does anybody out there have experience with 24p footage for a music video, working on AXP 4.8.2 Mac with mojo?  Please help me Obi Wan, you're my only hope.

    Thanx,

    Rick
    Power Mac G5 Dual 2.0 GHz 2 gig ram OS 10.4.2 250 Gig Internal HD Avid Xpress Pro 4.8.1 Q.T. 7.0.3 [view my complete system specs]
  • Sat, Jun 17 2006 8:02 PM In reply to

    • eladen
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    • Alameda, Ca
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    Re: Sync 48k Sound Track to 24p Project?

    Which Panasonic camera? If it is the DVX100 (A or B) That camera shoots at 23.98 And you should be in sync either at 29.97 or 23.98 project. If you shot with a varicam. there may be a setting to shoot true 24P but I am not sure. If it is shot at true 24P then you will need to pull down the audio file. I think someone posted a utility for doing this on this forum. You may want to do a search.

    Unfortunately with the mac version of AXP you are stuck with 28:1 if you used the standard pull down. This should change as soon as AXP 5.5 comes out (supposedly next week)
    MAC OSX10.4.7 Quicktime Pro 7.1 Dual 2gig 2 Gigs Ram Gfroce FX 5200 AXPRO 5.5.2 Mojo [view my complete system specs]
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  • Sat, Jun 17 2006 8:31 PM In reply to

    Re: Sync 48k Sound Track to 24p Project?

    Ok your syncing problem most likely has nothing to do with general pulldown per se. Please do not confuse the 3:2 cadence with  speed pulldown. This only happens in film to video transfers where the film is actually shot @ 24fps. The dvx100 does not shoot at 24fps. It's 23.97 in all it's "24" modes. There IS NO speed change.  In theory audio running in realtime should be in sync with video running in real time. So there is no reason to alter the speed of the audio. You only alter the speed of your audio when the speed of the picture is altered.

     BUT!!!!
    The dvx100 with is known to have issues with audio sync because of the processing that occurs in introducing the 3:2 cadence. Since the error is cause by processing delays going to a 23.97 project doesn't get rid of the delay. It's still there. The problem is really that the delay, while reported to be 2 frames sometimes seems to vary but it should be fixed for a continuous shot. Did you slate every take? also let's not ignore the fact that not everyone is a perfect lipsyncer.
    I would capture each take seperately, find the best av sync point on each take then group all the pic clips by the selected best sync point.
  • Sat, Jun 17 2006 9:25 PM In reply to

    • RTG23
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    • Joined on Thu, Oct 13 2005
    • Los Angeles
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    Re: Sync 48k Sound Track to 24p Project?

    Thanks for your replies.  You both offered great information.  Fortunately I figured out what the problem was, and for once it had nothing to do with the avid or project settings.  Turns out that on the 1st take, the camera operator had the wrong settings selected.  And of course, I began syncing with take 1.  Who knows why, but I decided to try another take, and finding sync was a piece of cake.  And did not slip at all.  I called the DP and apparently the camera operator must have realized his mistake and changed the settings for the rest of the shoot without the DP having known that there would be a problem with take 1.  Fortunately there was more than one take of that set up so it'll all work out. 

    Thanks again for your informative responses.

     

    Rick

     

    Power Mac G5 Dual 2.0 GHz 2 gig ram OS 10.4.2 250 Gig Internal HD Avid Xpress Pro 4.8.1 Q.T. 7.0.3 [view my complete system specs]
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