Foreword: Fix the issue of audio delay today. Let's find how to sync audio and video in 3 ways, with renowned free audio sync software - FlexClip, Blender, or FLV player.
When you edit a video or watch a video, noticeable audio delay (or audio offsetting) is troublesome and very uncomfortable. Let's study the issues of audio delay and find the solutions.
Part 1. Two Reasons for Audio Delay
a) The video content is created with an unsynced soundtrack (Video source is delayed): Either audio is slower, or animation is delayed.
b) For a streaming video, its reasons are more complicated: Besides the possibility of source delay, it can also cause by unsynced transmission - cache not-synchronization or slow network, or cause by display device failing to render video and audio simultaneously.
The article focuses on solving the issue of source delay (original), but also you can apply it to the delay of download video.
Part 2. How to Sync Audio and Video with Free Audio Sync Software? (A, B, C Solutions Included)
A. FlexClip Sync Audio Solution:
For short video contents (less than 1 min), a simpler solution is to use FlexClip video editor, along with an online video to MP3 tool, and sync audio and video accordingly.
The Tools Used:
- *Convert video to MP3 online free (Officially): https://audio.online-convert.com/convert-to-mp3
- *Free edit video and audio for synchronization (Officially): https://www.flexclip.com/
Side Note: If you want to sync video larger than 1 minute, this approach may not be very efficient, since currently, it focuses on and optimizes in dealing with short clips.
How to Use FlexClip to Sync Audio and Video for Free Online?
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Step One, Convert unsynced video to MP3 file.
1)Hit [Choose Files] in "Drop File Here" and select your video file.
2)Press [Start conversion] and download your soundtrack in MP3 format.
Step Two, Fix audio delay issue for free, by synchronizing audio and video.
Image board: How to sync short delayed video for free in FlexClip?
1)Open FlexClip video editor, register a free account, and create a new project.
2)Upload the video to a storyboard: [+Storyboard] > [Add Video] > [Browse My Files].
3)Mute the storyboard.
4)Upload the download MP3: Go music icon > [+ Add Music] > [Browse My Files].
5)Sync video and audio by dragging the mouse in "hand" icon: Hit "scissor" icon to trim soundtrack. In the windows of soundtrack trimming, mouse dragging of "double arrow" will change the beginning point; and "hand" icon mouse will drag & move the soundtrack.
6)Check if video and audio are synced, then trim the soundtrack. With a click of "play" icon, you can see if audio and video are still out of sync. The button of [Trim Music] is to finalize your audio synchronization.
Note: The click of [Trim Music] will not really trim your original (selected/uploaded/downloaded) audio file, but only copy out a part of audio content for your video production.
B. Blender Sync Audio Solution:
If the problematic video length is over 1 min, you will need an audio sync software to adjust audio efficiently. Blender can be an effective solution to sync audio and video for free.
The Tools Used:
- *Free desktop 3D & video editing software (Officially): https://www.blender.org/
How to Sync Delayed Audio in Blender Studio?
Image board: How to sync delayed video and output it to MP4?
1)Open Blender, Switch to "Video editing" interface.
2)Drag and drop your delayed video into the video sequence editor.
3)Right-click the dark green track, keystroke "G", then you can move & correct the audio track. "Alt" + "A" to preview the fix of audio delay.
4)Switch to "Properties" interface, and output synced video to MP4.
Here are the Blender video output steps:
- ->Switch "Display" pull-down list from "Image Editor" to "Keep UI".
- ->Find "Frame Rate", click "Custom (29.87fps)" in black and choose "24fps".
- ->Find "Output", change the default path from "/tmp\" to "/tmp\syncedvideo.mp4".
- ->Find "PNG" pull-down list, change it to "FFmpeg video".
- ->Keystroke "Ctrl + F12" to render (download) the MP4 synced video file.
Related Reading: How to Edit Video with Blender Video Editing Software, Step by Step?
C.FLV Audio Sync Solution (Only Fix for Video Playing):
If you only want to watch a delayed video but play it in sync (regardless of the video length), then there is no need to edit and sync the source and FLV happens to one of the best solutions.
The Tools Used:
- *Free FLV video player (Officially): https://www.videolan.org/vlc/index.html
How to Make Use of free FLV media player to Sync Audio and Video for Free?
1) Open FLV video player.
2) Drag and drop audio delaying video into the interface.
3) Hit [Tools] > [Track Synchronization].
Image board: Track Synchronization in FLV player.
4) Input a number in the blanket of Audio track synchronization. It will either hasten the audio or delay the audio.
Image board: Set audio delay time in FLV player.
Note: Once more, VLC player will only sync video play in VLC player, but it cannot sync the video content for saving. Nor can it output a synced video file.
Part 3. Wrapping Up
Among the 3 free audio offset solutions, online FlexClip audio sync approach is the simplest to resolve audio delays and produce a synced MP4 in video length less than 1 min. FLV video player is the most straightforward way to play a delayed video nicely. Ultimately, Blender is the most complex method to solve all video delay problems, once and for all.