5 Replies Latest reply on May 25, 2009 6:11 AM by Kroycom

    Video Audio Sync issue!

    bboyatomik Level 1

      Hi,

      For two days I shot a student film on the Panasonic HVX's P2 Cards, with separate sound recorded on an Eiderol, and currently editing in the native MXF files.

       

      On Day one, we shot 1080p 30 fps, and the timeline is syncing the audio just fine, the audio and video are obviously close equal size on timeline.  On Day two we shot on 720p and also 30fps, and now I found out it's like seven seconds behind right after the slate cue on set, obviously the audio timeline is much bigger than the video, unable to sync.

       

      Here's two MXF video files on both separate days

       

      Day 1

       

      Codec: DVCProHD 1080i30

      Resolution: 1280 x 1080

      Frame Type: Upper Field Interlaced

      Aspect 1.50

      Frame Rate: 29.970

       

       

      Day 2

       

      Codec: DVCProHD 720p60

      Resolution: 960 x 720

      Frame Type: Progressive

      Pixel Aspect 1.33

      Frame rate: 29.970

       

       

       

      I would appreciate some help, fairly new to CS4, I came from 2.0.

        • 1. Re: Video Audio Sync issue!
          Eddie Lotter Level 4

          Good work on the source clip details, but we need a few more details to get a more complete picture.

          Cheers
          Eddie

          • 2. Re: Video Audio Sync issue!
            Jim_Simon Level 8

            CS4 has a problem removing extra frames.  If you shot 720p/30 over 720p/60, I wonder if the issue is Premiere not removing the extra 30 frames.  Maybe try doing an Interpret Footage on those clips to force the 30 fps frame rate?

            • 3. Re: Video Audio Sync issue!
              bboyatomik Level 1

              Thanks anyways.

               

              I already the found the solution, or at least my solution.  I basically just slowed the video track on the timeine by 80%, and it syncs just fine, no drifts or anything, I tested it on a two minute shot, it syncs perfecty beginning to end. No obvious motion blur! What's funny is I did this last time, the only problem was I slowed it down by an odd number like 79.6%.  I'm sure my solution isn't technically the best thing, but I don't see any flaws how it looks after exporting it.

              • 4. Re: Video Audio Sync issue!
                the_wine_snob Level 9

                Great news!

                 

                Thank you for reporting your solution with your footage.

                 

                Hunt

                • 5. Re: Video Audio Sync issue!
                  Kroycom

                  Just a heads up: You didn't shoot 1080p you shot 1080i. That's 60 fields versus 30.

                  If you combine this with straight 720p footage, sequences/ timelines can get out of whack.

                  By the way, this can cause problems during export because AME will choose internally to deinterlace or not.

                  Well, you need both here.

                  BTW sync issues can also be caused if your Time Code is off or at a different type between your Edirol and the cams.

                   

                   

                  ------------------

                  Day 1

                   

                  Codec: DVCProHD 1080i30

                  Resolution: 1280 x 1080

                  Frame Type: Upper Field Interlaced

                  Aspect 1.50

                  Frame Rate: 29.970

                   

                   

                  Day 2

                   

                  Codec: DVCProHD 720p60

                  Resolution: 960 x 720

                  Frame Type: Progressive

                  Pixel Aspect 1.33

                  Frame rate: 29.970

                  ---------------