How to Fix Audio Video Sync Problem in MP4?

User Query: "I have an MP4 file that I recorded using my camera. But it is running out of sync errors. How to overcome this problem easily? I mean I spent a lot of time recording a video and don’t want to waste more time!"

We can understand how terrible it would be when your favourite videos play with Sync issues! To understand why your MP4 is out of sync, first you need to understand that every MP4 file has an audio and a video track. These audio and video tracks are synced using the time stamps that are created while filming or creating a video. No worries, there are various methods to fix Audio/Video Sync Issues.

But before moving on with the solutions, let’s understand what Audio/Video Sync is and the reasons for the Audio/video sync issues in MP4.

What is Audio Video Sync?

Audio/Video Sync is the process of synchronizing or combining the audio and video data streams with each other. Audio/video synchronization can be done both manually and automatically.

What Causes Audio/Video Sync Problems?

Audio-video sync issues occur when the audio and video components of a media file do not stream and do not sync with time when the audio is ahead or behind the video. The most common causes of audio and visual sync difficulties are differences in particular time stamps. You will also experience sync problems if an audio or video track's portion or frame is broken.

For example, if a video frame is broken, the media player will skip that frame and begin playing from the next. The audio track, on the other hand, will not be skipped to the following frame.

Such situations will cause a delay in MP4 audio, resulting in a mismatch in time stamps and a sync fault. Hopefully, you are now aware of what causes audio and video to be out of sync.

Here are a few reasons that lead to audio video out-of-sync-issues

1. Using Incompatible Audio or Video Codecs:

Incompatible audio and video codecs will cause audio and video out of sync because of each codec uses a different algorithm for compressing audio and video. When audio and video use different codecs, the decoding process for each track may occur at a different speed, leading to a mismatch between the two tracks.

2. Playing MP4 Videos on an Incompatible Media Player:

Playing videos on an incompatible video player will cause audio and video out of sync because of different video players use different algorithms and settings for decoding the audio and video tracks of a media player. Different video players use different buffering techniques and processing capabilities, which might also affect the timing of audio video tracks.

3. MP4 Video Files Getting Corrupt:

Video files that get corrupted during the encoding process might cause audio-video sync issues because corruption will lead to errors in the data. Due to this decoder might not be able to synchronize the audio and video during playback.

4. Video files are encoded using variable bitrate:

Generally, video files are encoded using variable bitrate. If the variation in the bitrate is too large or unpredictable it can cause audio and video sync issues.

5. Editing the video file after the completion of encoding:

Editing the video file after the completion of encoding will cause audio/video sync issues. Because when a video is encoded, the audio and video tracks are compressed and combined into a single file, and if that file is subsequently edited in a way that changes the timing it will cause the audio video out of sync.

6. Media players with high bitrate cause the audio/video sync issue:

When a video file is played using a media player with high bitrate settings, it can cause the computer to struggle to process and playback the file. This can result in dropped frames or skipped audio, which can cause the audio and video out of sync.

Basic Troubleshooting to Fix Audio/Video Sync Issues

Here are some quick ways to fix audio/video sync issues

1. Adjust playback settings:

Many media players have settings that allow you to adjust the audio/video out of sync manually. Look for options that allow you to delay or advance the audio track by a few milliseconds, and try adjusting these settings until the audio and video are in sync.

2. Use different media players:

Try playing the same video file in a different media player to see if the sync issue persists. Some media players may handle certain video codecs or bitrates better than others, and switching to a different player may help resolve the issue.

3. Re-encode the video:

If the video file is out of sync due to a codec or encoding issue, you may need to re-encode the video using different settings. This can be done using video editing software or dedicated encoding software. Be sure to use settings that are appropriate for the type of video you are working with.

4. Manually adjust the audio track:

If the audio and video tracks are only slightly out of sync, you may be able to manually adjust the audio track in video editing software to restore sync. This involves shifting the audio track forward or backward by a few frames to match the timing of the video

5. Re-download or re-rip the video:

If the video file is corrupt or was not ripped properly, it may be necessary to download or rip the video again. This can be done using a different source or different ripping software.

How to Fix Audio Video Sync Problem in MP4?

Fix Audio Video Sync Issues in MP4 with the help of the below methods and you can try this method to fix AVI video Out of Sync issues as well. If you feel that your MP4 video is corrupt we suggest you go with the 4th method to avoid further corruption.

Method 1: Fix Audio and Video Out of Sync Issue using VLC

VLC media player is a free media player software that helps in fixing most of the video problems including audio video synch issue on MP4. To fix delayed audio on a video issues make use of the VLC media player. However, this is a temporary fix to solve the issue as VLC cannot permanently fix audio and video sync problem. Following are the instructions to fix video sync errors.

• Open the video using the VLC media player, and go to Tools > Adjustment and Effects > Synchronization > Audio Track Synchronization.



• Within the synchronization dialogue box you will find an audio track synchronization tool from which you can adjust the audio track time frame. Adjust the time frame as required and click on close.

Method 2: Fix Audio/Video Sync Problems using Adobe Premier

You can use Adobe premier to Fix the Audio/Video Sync Issue MP4 Using Adobe Premier. Follow the steps to fix the Audio/Video Sync problem in Mp4.

• Place your MP4 Audio and Video files in the timeline on top of one another
• Highlight the audio and video Now, right-click and choose Synchronize from the dropdown.
• Select the MP4 Audio and select the track that you want to Synchronize
• Select the link to link the clips
• Adobe premiere will sync your audio and video once you click on the link

Method 3: Fix Audio/video Delay Using Windows Media Player

If you are facing an Audio video out-of-sync issue in a windows media player, you can fix it wot the help of the below steps:

• Open Windows Media Player and Click on tools
• Select Options
• Go to Performance Tab and turn on Drop frames to keep audio and video synchronized
• Now, Click Ok

If the above-mentioned method doesn’t help you fix the sync error, then you need to rely on best professional tool to repair damaged video files.

How to fix audio video out of sync on windows and mac?

Here are the solutions to fix audio/video sync issues on windows and mac:

Run Audio troubleshooter

If you are facing audio/video out of sync on windows or mac, it may be because of audio problems.

Follow the below steps to Run an Audio troubleshooter:

• Go to Settings
• Click on Update and Security and select Troubleshoot
• Select Playing Audio and click on Run the troubleshooter

Check speaker properties

Sometimes speaker settings will cause your computer audio to stop while playing a video.

Here are the steps to set the speaker settings

• Open Control Panel
• Select Small icons from View by
• Click on sound
• Choose the device and Click on Properties
• Open Advanced tab
• Under Exclusive Mode, uncheck the Give exclusive mode applications priority

Update Audio Drivers

Follow the below-mentioned steps to Update Audio Drivers:

• Open Device Manager
• Click on the Sound, video, and game controllers option
• Open the speaker driver
• Select the Driver and click on Update Driver

Method 4: A Permanent Fix to MP4 Audio Video Sync Issue

Remo Repair MOV can precisely locate the damaged audio or video frame and fix it. Not only that, with the ability to fix complex errors such as corrupted video files, a video file that cannot be played and broken a video file header, MP4 video not showing, Remo is a perfect tool for mainstream and upcoming content creators.

Follow the simple steps and resolve sync issues on the MP4 video files, even if it caused due to accessing them with incompatible players, incorrect file conversion, etc.

Step 1: Download and install the free version of Remo Video Repair Software.

Step 2: Click on the Repair button - It will begin the repair process.

Step 3: You can view the repaired video using the Preview

Hopefully, by now the audio-video sync issue or any other issue has been resolved. Play the repaired video(s) in any media player.

Quick Tips to Avoid Audio/Video Sync issue:

• Out of sync issues are generally associated with videos that are downloaded from websites that are not trusted; therefore, avoid downloading files from pirated and other untrustworthy sites
• Choose appropriate players for playing the videos