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Blackmamba427
Participant
December 29, 2019
Answered

Variable Frame Rate + Audio out of sync

  • December 29, 2019
  • 2 replies
  • 9333 views
Hi there,

I've been looking at this for hours now and it's driving me crazy. I've tried googling, but nothing has managed to fix it yet.

I've recorded a short 10 minute video from my webcam (.mp4) and imported it into Premier Pro. It says
"File Path: ...."
Type: MPEG Movie
File Size: 1.25 GB
Image Size: 1920 x 1080
Frame Rate: 29.59
Source Audio Format: 44100 Hz - compressed - Mono
Project Audio Format: 44100 Hz - 32 bit floating point - Mono
Total Duration: 00;10;06;07
Pixel Aspect Ratio: 1.0
Alpha: None
Video Codec Type: MP4/MOV H.264 4:2:0 (Full Range)
Variable Frame Rate Detected"
 
When I go to Export, I have the following selected:
Format: H.264
Preset: Match Source - High Bitrate
Output FPS: 29.97

Now I imagine that the audio is out of sync because the video is now being exported at 29.97, but the audio is still stuck at 29.59 - I can't find a way of exporting the video at 29.59. I exported it at 25fps and it was even worse than exporting at 29.97

I tried using Handbrake software to convert from Variable Frame Rate to Constant, but they didn't work. I tried changing sequence setting to 29.97 and exporting at 29.97, but that didn't work.
I tried changing the source file from .mp4 to .mov and installing quicktime as some suggested,but that didnt work.
I tried "Modify > Interpret Footage" and changing "Assume Frame Rate" to 29.97 - but that didn't work.
 
If anyone could please help me out on this, I would be eternally grateful. I've spent hours on this now and it's slowly making me go insane.

Also, in future, is there a way to ensure that my webcam recordings are recording at a consistent/constant frame rate? When I look at my recordings, they vary a lot, 29.46, 29.77, 29.63 and so on..
 
I am using a Logitech C920 for recording with.
 
Thank you!
 
This topic has been closed for replies.
Correct answer gerikp

I'm really surprised Handbrake didn't fix your problem with your VFR. I don't want to assume anything but are you sure you used the correct settings in Handbrake?

 

I just finished recording something recently and the SD card wasn't fast enough to keep up, and so there were a lot of dropped video frames that look like stuttering and the video and audio became out of sync. I just ended up trashing the files and have to redo it.

2 replies

S
SMcreative3644190
Inspiring
August 10, 2021

Handbrake is still the official Adobe answer to this? Just double checking, I've seen screenshots of a master tab under Effect Controls with "Preservre Audio Sync" as a setting. Also wasted a lot of time searching for it.

N
ninakirov
Inspiring
November 16, 2021

I've tried everything to fix out of sync audio from Facebook, fairly sure it was originally shot on an iPad and uploaded as part of a live FB stream. When I download it it has a VFR but no amout of converting through Handbrake (or anything else) will fix it. It looks ok when it's first through HB but by the time I render it through AE the audio is a fraction of a second out at the end of 18 mins.
The only solution I can think of is to slice it up into sections in the hope that the audio will drift less but it's hardly practical on multiple files. I've just askd the client to film a dupe at the same time as streaming so I can acess less processed footage.
I know converting to a CFR should work but for some reason it doesn't.

Very annoying.

gerikp
Community Expert
gerikpCommunity ExpertCorrect answer
Community Expert
December 29, 2019

I'm really surprised Handbrake didn't fix your problem with your VFR. I don't want to assume anything but are you sure you used the correct settings in Handbrake?

 

I just finished recording something recently and the SD card wasn't fast enough to keep up, and so there were a lot of dropped video frames that look like stuttering and the video and audio became out of sync. I just ended up trashing the files and have to redo it.

    B
    Blackmamba427Author
    Participant
    December 29, 2019

    Perhaps I wasn't using the correct settings. I followed a youtube tutorial, but only tried it once.


    Here is what I did;

    "File > Open single video file" 

    "Clicked on Video Tab, then changed Frame Rate to 29.97" 

    "Changed Peak Framerate to Constant Frame Rate"

    Preset remained at 1080p30 (Modified)

    Video Codec remained H.264 (x264)

    Quality remained at 24 RF 

    Encode 

     

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