FCP audio sync problem after exporting.

Question

Level 1

4 points

FCP audio sync problem after exporting.

Hi Guys! I am new to FCP community and lately I have started learning/editing videos. I exported one of my track from LogicX (44khz - Mp3). I have matched the FCP project setting with the sample rate of the audio. Apparently my video is 23.98 fps as I had downloaded few clips from the internet (Mp4 Format) to try my hands on. Now when I playback the video in the fcp editor with the audio I imported from logic, it is well synced but, after exporting it and playing in my apple devices (except VLC) the video becomes out of sync. Only in VLC it plays fine. I read so many forum and pages. But couldn't get the solution.

The video is almost 3 minutes.

P.S : I don't know much about the encoders. I exported my video in the default video mode. I tried different setting if it would help. But sadly no luck..

MacBook Pro 13″, macOS 10.15

Posted on May 29, 2020 2:40 PM

Reply

Answer 1

Top-ranking reply

Kazinama Author

Level 1

4 points

May 30, 2020 5:07 AM in response to Kazinama

Hey Guys! I have finally found the solution. It has nothing to do with the sample rate. Since I modified my video project with the desired sample rate. Also It wasn't possible for me to change the sample rate of logic. Because I already had recorded external audio/instruments. So, if I would have changed the sample rate that would also change the pitch of the audio as well. Anyway. I sent the project to Apple's compressor through FCPX and then exported the video in Apples 720p compression resolution. Also I changed the frame rate from 23.98 to 24 precisely. I think the drift effect is because of the frame rate encoding algorithm. I really don't know the science behind it. But it worked. Although I tried many times before with FCPX encoders but didn't work. Finally Compressor did job! Thanks to the holy encoder..! Thanks to you guys for instant reply and suggestions. Cheers.

Reply