20 milliseconds delay

Forum|Forum|2 years ago
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.

Editing

This topic has been closed for replies.

R

Richard M Knight

Community Expert

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

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?

Remote Index

Inspiring

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.

Hello F31911627hlee,

Thanks for the additional info you posted.

The behaviour you describe is, indeed, odd and I have no explanation for it. Clips should stay in the position they are placed in the timeline! It would be great to get an explanation of this behaviour from someone who knows.

However, it is important to realize that your video frames are changing only every 41.7 milliseconds. (At 23.976 seconds, 1 / 23.976 = 0.0417). This means that a change of 20 milliseconds is less than half the duration of a video frame, and it likely means that this change does not affect the video frame on which the sound occurs. There is a less than 50% chance that it does change the the video frame on which the sound occurs. Is this the case?

If so, I would do a larger change and move the sound another 20 milliseconds into the desired frame.

Again - it's strange that the sound is moving and that Premiere Pro is not keeping the sound where you place it. But you may be able to move the sound a bit a acheive a more stable sync relationship to the video frame which you are dealing with.

Hope that helps.

R.

F

F31911627hleeAuthor

Known Participant

https://ibb.co/3fR3hyL

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