Fix Audio/Video Delay/Sync WITHOUT RE-ENCODING - Easy Tutorial Windows/macOS/Linux

Fix video WITHOUT RE-ENCODING! Cameras, phones, software and people can cause video files to be opened incorrectly by video editing apps, making audio and video non-synchronized while the sound waveform indicates otherwise. Premiere Pro, Shotcut, Kdenlive, Final Cut X Pro - none are safe. But it's easy to solve, all you have to do is split the video file into video-only MP4 and audio-only WAV files to repair the problem. Then import both into your video editor and align them to correct the problem.

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[juraj_b]

Your title is misleading but led me to the ffmpeg path - no need to export each, sync and then export in the video editor. If you want to move the audio by 1 second, use this command

ffmpeg.exe -i "movie.mp4" -itsoffset 1.00 -i "movie.mp4" -map 0:v -map 1:a -c copy "movie-audio-delayed.mp4"

[Kyrelel]

Fix video WITHOUT RE-ENCODING!
Step 1 Split audio and video
Step 2 Re-encode :/

[carw]

THANK YOU!! You just saved me some precious hours of re-encoding a couple of 4K videos!

[YumanoidPontifex]

hmm it's not really "WITHOUT RE-ENCODING" if the video editor you use to mux them in the end can only export by encoding, so a bit misleading in the title.

[GinzaninGamer]

I use shotcut, and my audio keeps messing up in the video. It never happened before when I used clip champ, and need some help on how to fix this problem. It goes off balance, and messes up in parts of the video I never done anything wrong to it too it's weird.

[tennoshenaniganizer]

Okay, you completely lost me at the 0:55 mark. What do you mean same folder? How do we open a terminal? It feels like you left out steps for those of us that don't do coding. And what if we're trying to put multiple videos together into one long video? The problem I'm having is the audio desyncing when i export from shotcut into my folders. The audio is fine before shotcut, but shotcut is what's distorting it.

EDIT: Okay, so investigating further, it seems the video is a few frame behind and ends up lagging behind the audio, but that ONLY happens after i put the file into Shotcut for editing. Before i do that, the video sync is perfect. I dont understand.

[zakhoskins]

Good tutorial. Slightly different issue for me here. I've had some issues concatenating together .flv videos that have been split up into separate files. I've mainly been using libav based tools instead of ffmpeg since I run Mint, and I've also tried both mencoder and avidemux. Avidemux almost lets me do what I want. I can get the video concatenated together just fine, but at a certain point in the amalgamated output file, the audio will cut out every time. The audio that's in the corresponding separate .flv plays just fine, but for some reason when it's combined together with other files it cuts out.

Whenever I load the first FLV, avidemux complains that H.264 needs to be opened in safe mode, which I choose. And when I use mencoder like so:

mencoder -forceidx -of lavf -oac mp3lame -ovc copy -o output.flv file1.flv file2.flv file3.flv file4.flv file5.flv

mencoder complains that:

"All video files must have identical fps, resolution, and codec for -ovc copy."

I'm not using mencoder and avidemux in tandem; just trying to solve it with two different approaches. I believe mencoder actually uses ffmpeg or libav (depending on what you have installed) under the hood. Obviously there's something wrong here with the audio being at a different rate for one file vs the others. However, this is where I have no clue what to do. How do I get the audio to be the same in all the files so everything syncs up right and avidemux will concatenate it together correctly in the output file?

[Wording]

Hey, I've tried importing a WAV file, exported from Audacity, but it is not letting me put the WAV file into ShotCut

[thegrantedgamer]

I have a different issue. In the editing I time the music perfectly with the video, and after I export it the music is off by a bit. Very annoying, can you help?

[MustafaSaadi_]

thats stupid my dude u already encoded the audio to wav

[AngelsModz]

Welll great I wish I would have known I needed a video fixinf program also befor I got to near the end, thanks alot. At the begining maybe say you need a program and this other stuff