The problem that the audio waveform and video screen do not match

Report · Jun 22, 2023

Dear developers,

I'm having trouble matching audio waveforms with video frames in my editing work. Specifically:

Generally, I think a rumbling waveform corresponds to a word (valley → crest → valley). So I used to listen to the audio waveform directly and make a rough cut of the material, cutting out some of the repetitive and redundant words in the lines, such as "emm, Wow, Well".

But recently I found that in one of my video clips, the waveform and the picture do not match up (the waveform does not match up, but the audio does). For example, in this Gif, the mouse pointer/time indicator is in the right place. At this moment, the person in the picture is saying a word. By definition, the audio track should be cresting or near the crest at this point. But when the timeline is not scaled up enough, the audio waveform is collapsed and undulating. But if I zoom in on the timeline, the peaks pop up again.

Please tell me if this is a bug, or if it is caused by the waveform unit scale of PR, or something else. If I don't want to change my editing style, is there any way to avoid this kind of problem? I would appreciate your answer. I am very rambling, so please forgive me.

Report · Jun 24, 2023

When I zoom in on the timeline to a certain point, the audio track gets "refreshed" and the audio waveform changes. The waveform before the refresh does not match the actual sound. If I export the audio track separately and then import it, I can also see that the waveform and length is different from the original video.

Report · Jun 26, 2023

This is probably caused by the PEK files on disk being stale or incorrect. Have you recently re-linked the media for this project?

The quickest way to fix this is to delete the Media Cache and let it rebuild with the current media.