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F31911627hlee
Known Participant
August 27, 2023
Question

20 milliseconds delay

  • August 27, 2023
  • 2 replies
  • 7132 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 29, 2023

      Hello F31911627hlee,

       

      re: Linking

      The linking function is limited in certain ways, for example you can only link one video clip with one audio clip in serial (you can link several audio clips in parallel on different tracks, but not several one after the other, serially, on one track). Do a search for more explanation of this function if it is not clear.

       

      re: Sync

      I have a number of questions and suggestions to clarify:

       

      1. I'd be interested to know why you're using audio units not frames.

      2. How are you identifying points of interest in your sound - are you doing so visually / using the waveform or by listening / scrub?

       

      These are my suggestions:

      3. With "show audio time units" de-selected, find your reference video frame (you've described it as the first "mouth open" frame). Make a cut at the start of this frame in the video and the start of the next frame in the video. Make sure "show through edits" is enabled in your timeline. You should now see 1 frame of video clearly in the timeline - with a cut at the start and end of 1 frame.

      4. With 'show audio time units' selected again, and "samples" not "milliseconds" selected, scrub and find the very first sample and find the precise start of the sound you are trying to sync. Make a cut at the start of this sound in the audio. You should now see a cut in the audio at the very beginning of the sound you are interested in syncing.

      5. Align the cut in the audio with the cut in the video.

      6. Test closing and opening the project. Observe if the "movement" you have been seeing is happening. If so, describe precisely where the cuts were when you place them in sync, and where they are after moving.

       

      R.


      Hi, Remote Index. Thank you for supporting me.

      Originally, I worked based on "audio samples". When I select "show audio time units", looks timeline is more sensitive. For example, I can listen exactly when the following speech "contaminarion noise" begins.

      I never changed to "miliseconds" before open this thread, but it looks still more sensitive than "audio samples".

      Talking about this scene, for example, girl's mouth opened at 00:04:38:09340. "following speech noise contamination" begins at 00:04:38:10333 and audio wave begins around 00:04:38:12628. I was totally satisfied with this arrangement. Adjusting based on "audio samples" is wonderful. I really don't understand why the time on video is changing.

      And, after I linked audio and video as R Neil Haugen said, but this event turned to happen again. There was an alteration of "20-units of audio sample". The same happened with miliseconds metrics. Without this disturbing fact, I think Premiere is wonderful for audio sync.

      https://ibb.co/pxX02w9

      [Using miliseconds metrics, girl's mouth opened at 00:04:38.194. "following speech noise contamination" begins around 00:04:38.206 and audio wave begins at 00:04:38.262. ]

      When I say "following speech noise contamination", I mean the noise from following wave sound that we can hear before it.

      When I open the software again, mouth opens at 00:04:38:07338 in video. It means "following speech noise contamination" and audio wave will spend more time to be produced.

      F
      F31911627hleeAuthor
      Known Participant
      August 27, 2023

      https://ibb.co/3fR3hyL

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