Handrake does a good job when converting video or rip non-protected DVD disc, however, one of the annoying issue that people often encounter is that Handbrake output video and audio is out of sync just as the condition in the below parts：
"I'm using AnyDVD and Handbrake to rip my DVDs. I've been playing around with one DVD in which the resulting MP4 has the audio out of sync by around 500ms for Main or High profiles. From testing I've found the audio is synced if the output file is MKV, or Baseline profile is used. I've muxing the audio separately and reboxing the MKV to MP4 with no success. I am using the constant frame rate setting also. I was wondering if anyone could help me out. Thanks."
Reasons that cause Handbrake video audio out of sync issue
A audio and video out of sync condition can be illustrated as when your preview a video in a video displaying window, you hear the audio before seeing the corresponding action on screen. The Handbrake video audio sync issue can also caused due to the following reasons:
1. Media Player Problem
Some media players such as Windows Media Player and QuickTime player will have video lagging issues. Therfore, just try other more powerful media players like VLC, KMPlayer, etc.
2. Play video with Handbrake on a processor intensive computer
Some old computer may lacks the configuration to playback high definition video which can easily result in "HandBrake audio falls behind video" issue.
3. Original Video is Out-of-sync
Don's ask how to fix Handbrake audio out of sync problem, the A/V of your original video itself may be already out-of-sync.
HandBrake designates "Variable Framerate" as default setting when you encode videos or rip DVDs. In fact, it may probably cause HandBrake audio sync issue. Select certain "Constant Framerate" to fix Handbrake audio video out of sync.
How to Fix Handbrake Video Audio out of Sync Issue?
Solution 1: Forward or backward to Keep Pace with Video Using Player
Try some media player like VLC to backward or forward to keep audio and video synchronized.
Solution 2: Adjust framerates in Handbrake.
Click the "Video" tab under "Output Settings." Select the "Framerate (FPS)" drop-down menu and choose a different frame rate for your video. Fixing an issue like this will require some trial-and-error work. Click "Preview" to view a preview of your file as it will be outputted using the current settings. If the audio and video syncing issue is fixed, you can proceed with the encode using HandBrake. If the issue is not fixed, select a different frame rate from the drop-down menu and try again.
Solution 3: Handbrake alternative to rip DVD and convert video with no video/audio sync issue
Above listed solutions still can't solve Handbrake video/audio out of sync issue or you are looking for a more advanced video dvd conversion tool to eliminiate this head-scratching issue? A best Handbrake alternative - Pavtube Video Converter Ultimate for Windows/Mac is highly recommended to you. The program adopts advanced audio and video sync technology to fix all video/audio sync problems so that you can enjoy smooth video with no interruption. This powerful media conversion tool has full support for commercial DVD disc and digital video/audio file formats with various different file formats. You can convert DVD and rip video to any of your desired file formats and also devices and program preset profile formats.