"I'm using Handbrake for all my encoding. But like the title says, the audio is falling out of sync. For the first 3-5 seconds it's fine, then it starts falling behind the video. The longer you let the video play, the worse the problem gets. How can I play the video with perfect audio/video sync?" - Apple Support Communities
It's often the case that when you rip DVD or convert video with Handbrake, the output audio lagged several seconds or more behind video you played. If you happen to suffer from the same video/audio desynchrony in Handbrake, here we go. This guide will specify the reasons and solutions to solve Handbrake output audio and video out of sync problem.
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What Causes Handbrake Output Audio Not Match up with Video
Like many other programs, the A/V out of sync after DVD ripping error is not caused by Handbrake itself. Instead, such issue is resulted from the following cases:
1. The decoder/media player.
The media players such as Windows Media Player, VLC and QuickTime player sometimes have a hiccup. Take QuickTime for instance. It may have timescale issues when bringing MPEG source into Avid or Final Cut Pro, which may make audio go out of sync with video.
2. Encoding video with intense features.
If you are working on a slow computer with low configuration but encoding video with high refs, CABAC Entropy coding, 8*8 transform, Pyramidal B-Frames, etc, your audio and video will be synced in a wrong way.
3. Restart your computer system.
The intensive use of CPU can lead your system go abnormal. So the processes like video encoding, editing or downloading will not go smooth. This is where the audio/video out of sync happens.
4. Be careful of Xvix.
When you are encoding an MPEG-2 content, be selective in the codecs. For the older ASP codecs like DivX and Xvid, and the previous .avi container, you are not suggested to choose them as they are usually considered as the crime culprit of audio/video sync issues.
How to Solve Handbrake Video/Audio out of Sync Problem
Solution 1: Adjust the Framerate (FPS) in Handbrake
To keep your output video synchronous with audio in Handbrake, make sure the output framerate setting matches the source file's framerate. This Handbrake rip DVD tutorial will show you to make perfect sync between audio and video.
Download Handbrake and open it; click "Source" to import the file that has an A/V syncing issue. Click the drop-down menu Framerate (FPS) to select an appropriate frame rate for your video. Then hit "Preview" button to check whether the syncing problem is fixed. If so, you can go on the encoding process with Handbrake. Or else, try another frame rate till the problem is solved.
Solution 2: Backward or Forward Audio to Keep Pace with Video Using Player
Choose some media player like VLC with backward or forward functions to keep audio and video synchronized.
Solution 3: Handbrake Alternative to Convert DVD and Video with Consistent Sound and Image
Actually, there is an easy way to both rip DVD, convert video and solve the audio video out of sync issue easily. You just need a Handbrake alternative, called MacX Video Converter Pro, to fulfill your needs. Every single encode on this Handbrake alternative will not have any delay between the audio and video. This video converter for Mac works excellently as a video downloader, converter, recorder, editor and slideshow maker to let you download and convert videos to MKV, AVI, FLV, MOV, MP4, etc for iPhone XS/XR/X/8/7/6/6+/5S/5C, iPad Mini 3/Air 2, Samsung Galaxy S9, etc with perfect audio and video sync. Please check its windows version if you are using Handbrake on your Windows 10/8/7.