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F31911627hlee
Known Participant
August 27, 2023
Question

20 milliseconds delay

  • August 27, 2023
  • 2 replies
  • 7125 views

Hi, friends. I use Premiere to synchronize audio and video (.avi) and I love this software, but there's a thing bothering me. I noted the sometimes a frame suffers a time variation of 20 milliseconds. The difference is always 20 milliseconds! For example: Before to repair the audio synchronization, I select a frame that begins at 00:03:11:43200. After I synchronize that and several others parts, I return to "frame 00:03:11:43200" in order to see it again, but, now, the same frame begins at 00:03:11:41200! I would like to know why it happens and if is there a way to avoid that variation, since it destroys the confidence on lipsync. Should I use mp4 intead avi?

[url=https://ibb.co/3fR3hyL][img]https://i.ibb.co/3fR3hyL/Adobe-Premiere-Sy.jpg[/img][/url]

Thank you very much in advance.

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    2 replies

    R
    Community Expert
    Richard M KnightCommunity Expert
    Community Expert
    August 27, 2023

    It looks like you are working with Audio units, there is a good chance Premiere is going to the nearest viseo frame.

      F
      F31911627hleeAuthor
      Known Participant
      August 27, 2023

      I don't understand it. When I revisit  the same frame several times as I continue fixing other parts, it can return to normal or no. I would like to know a way to stop it, since I can't be sure about the timing. If I set some audio 5 miliseconds after the mouth opens, for example, and the same frame now starts 20 miliseconds earlier, sound will be produced 15 miliseconds before the mouth opening. And, sometimes, it returns to original timing when I revisit it. I have no confidence to do the job anymore. Do you have any solution?

      F
      F31911627hleeAuthor
      Known Participant
      August 28, 2023

      I'm having trouble following your description.

       

      This speaks to R Neil Haugen's point: in the timeline you have video clips and audio clips. The smallest unit of video is one frame. When you enable audio units in your timeline, the smallest unit for audio is either audio samples or milliseconds, as you choose.

       

      Thus, when you say "I pick the first frame where the mouth opens" - you are referring to a video frame. This will have a start time (in either timecode frames or audio units). And it will have a duration (of one frame or 0.0417 seconds). I presume you are referring to start time when you say "pick a frame" (though this is unclear).

       

      When you say you "put the audio exactly 1 frame after" you are saying that you placed the audio 1 video frame later - or I don't understand what you are saying. Remember - in your timeline, a video frame has a duration of 41.7 milliseconds.

       

      I don't think you are being precise with your language here and it is making it diffucult to understand your description of what is happening.

       

      R.


      Well, I think I don't understand it at all. I have a video and a audio. I select milliseconds instead audio samples. Forget frames language, please. Even I don't do anything, I see that character mouth opens at 00:04:38.194. I close Premiere. When I open it again e select the same scene. Character mouth now opens at 00:04:38.154. I didn't nothing. I just think character mouth should open at 00:04:38.194. But this time changes depending on the time I open the software.

      F
      F31911627hleeAuthor
      Known Participant
      August 27, 2023

      https://ibb.co/3fR3hyL

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