2 Replies Latest reply on May 11, 2009 2:13 PM by Dag Norum

    audio + video sync goes slightly off on export

    usmcmarine

      how can i fix this?  in my preview window when i watch the video ive made i get it all sync'd to the exact milisecond that my video is made more powerful by changes in the audio, but when i export it (uncompressed avi btw) to a movie file the sync goes off by a few miliseconds.

       

      is there some way to avoid this?  its happened to me a couple times now, after a freaking long *** week of editing things exactly the way i want them, the project goes to hell and i have to move everything over by miliseconds and guess and check export style till its adequate.

       

      im using adobe premiere pro cs3 btw.

       

      anything i can do?

       

      edit: adding in a couple details that mite be important.

       

      source files are 2 mp4 files that didnt want to import directly to premiere so i converted them using SUPER to avi's, and now they import just fine.

      and one m4v file which worked rite away.

       

      my computer hardware shouldnt be an issue, it handles Crysis nicely and is top drawer stuff.

       

      im kind of an amateur at Premiere so I figured it might just be me overlooking something important and easy for u guys to pick up on.

        • 1. Re: audio + video sync goes slightly off on export
          the_wine_snob Level 9

          I have seen the same thing, when using converted MPEG-2 files (converted to DV-AVI Type II in DigitalMedia Converter). Everything was perfect in PrPro, and even when I Imported the edited DV-AVI's into Encore. When Burned to DVD, several scenes had OOS issues. I "fixed" these over and over in PrPro, but could NOT get them to Burn properly - regardless. I chalked it up to the original source files, and/or DMC's conversion. However, it's conversions from all sorts of crap are usually 100%, with no OOS problems. These just gave me fits, and I finally had to tell the client, that unless we could get to the original source files, what you see is "as good as it gets."

           

          In my case, I even tried to "guesstamate" the OOS, as I could not see/hear it in PrPro and Encore. Just flat did not work. Most Clips were perfect, but some would flat not sync, regardless. Lot of work, and wasted time, and never seemed to even get closer to sync in these few Clips. Why? Have no clue, as all the rest (same footage, format, CODEC, etc.) synced up fine. Very frustrating, but that can be the nature of the beast, when working with non DV-AVI material sometimes.

           

          Good luck on this, and sorry that I do not have an answer for you. Though too late for my Project, if you ever do get it nailed down with some fix, or workaround, please post. I'm curious.

           

          Hunt

          • 2. Re: audio + video sync goes slightly off on export
            Dag Norum Level 2

            usmcmarine,

             

            >"get it all sync'd to the exact milisecond"

             

            How on earth somebody is able to that is a big wonder of mine (except for if they use 1000 fps though).

             

            Anyway, there's more between heaven and earth than anywhere else, so...

             

            I have also have had some cases of "funny" un-sync'ed cases, well, actually not that "funny" if I think about the source footage.

            My solution has been to treat video and audio separate, one conversion of the video (to uncomressed avi or mov) with one program, and the conversion of the audio with another program (PS! Never used Super for anything btw), and then joined audio and video up again in Premiere.

             

            It mite be rite, and it has solved my problems, but it could as well be wrong for your footage, but maybe worth a try.

             

            Dag

             

            PPS! Judging sync inside Premier is one thing I don't do too much, except for visually (waveform compared to picture, not playback).