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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

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    Richard M Knight
    Adobe 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.

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      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

      You need to understand working both in audio units and frames.

       

      If your timeline is set for displaying audio units, you have control down to the millisecond, for sliding/adjusting audio tracks. And audio tracks only.

       

      With the timeline time display set for audio units, you can micro-adjust sound tracks in tiny amounts.

       

      Video tracks can never be changed by less than a full frame. Which is why the default working order for timelines is their video framerate. You can't move a video frame a partial frame either way.

       

      So for say 23.976 timelines, each frame has a time length of 1/23.976th of a second. Which is 0.0417 seconds. And can't be subdivided.

       

      48fps would be about 0.0208 seconds, so ... are you working with clips on a timeline of 48fps?


      Yo. I'm working on such files:

      Frame rate mode : Constant
      Frame rate : 23.976 (24000/1001) FPS
      Color space : YUV
      Chroma subsampling : 4:2:0
      Bit depth : 8 bits
      I think I was not able to convey my problem or I really don't understand what you are talking about. My problem is the timing of a same scene is changing. Characters mouth opens at 00:03:11:43200, I moce audio to fix the lipsync and after some time, when I revisit this scene, the mouth is opening at 00:03:11:41200. And, some time after that, when I turn to revisit it, mouth opens at 00:03:11:43200 again! Isn't a way to be sure mouth opens at 00:03:11:41200 and always will open at 00:03:11:41200?  I wonder if I change timeline from "audio samples" to miliseconds, it will enough... Thank you very much.

       

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      F31911627hleeAuthor
      Known Participant
      August 27, 2023

      https://ibb.co/3fR3hyL

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