Exporting to mp4 desyncs the sound...

Richard-Merriman wrote on 12/23/2024, 1:10 PM

When the edited video plays in movie studio 2023 platinum the sound is perfect. After I export to mp4 and it plays in windows media player, the sound is behind by several seconds. This just started. It worked fine last time. The video import is a cell phone video with sound. I only put a intro music and title text. My first time doing intro music.

Comments

johnebaker wrote on 12/24/2024, 2:31 AM

@Richard-Merriman

. . . . The video import is a cell phone video with sound. . . . .

The most common cause of the issue is not the program or export, but the cell phone video being Variable Frame Rate (VFR).

Many video editors do not handle VFR video correctly.

The video needs converting before importing to Constant Frame rate (CFR) using a converter such as Handbrake or AviDemux.

See @AAProds tutorial here on how to do this with AviDemux

John EB
Forum Moderator

Richard-Merriman wrote on 12/24/2024, 3:21 AM

I changed the output frame rate from 29.8-ish to 30 fps, and it fixed it.

johnebaker wrote on 12/24/2024, 3:42 PM

@Richard-Merriman

. . . . I changed the output frame rate from 29.8-ish to 30 fps . . . .

I assume when you imported the video, you got a message that the video is 29.8 ish fps and the project was set to 29.970, or 30 fps, and clicked Adjust is this correct?

The standard NTSC frame rate is 29.97 fps, the value above suggests to me that is the average frame rate value and the actual range of framerate variance is within ± 2 fps of that target framerate of 30 fps, ie it is varying between 28 - 32 fps.

You can check this with a program called MediaInfo and analysing the phone video clip - see this tutorial on how to get the data. In the video section of the analysis you should see something like this:

Frame rate mode : Variable
Frame rate : 30.096 FPS
Minimum frame rate : 29.970 FPS
Maximum frame rate : 30.272 FPS
Real frame rate : 30.000 FPS

The 'Real' framerate is the actual frame rate set for recording.

As you can see the actual 'Frame rate' value, which is the average achieved, was slightly higher and minimum/maximum range is very narrow.

HTH

John EB