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11 votes

Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly

The usual solution for this situation: -fflags +genpts It should eliminate the warning, but there's no guarantee your sync issues will be solved.
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9 votes
Accepted

ffmpeg concat introduces a/v sync problem

Run ffmpeg -i titlefile.mp4 -vf setdar=16/9 -video_track_timescale 29971 -ac 1 newtitle.mp4 and then run concat with the new title video. Modern containers like MP4 have Presentation TimeStamps, ...
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  • 30.2k
6 votes

Remove flickering due to artificial light with ffmpeg

The following worked well for me, based on the same ideas http://www.premiumbeat.com/blog/quick-trick-for-de-flickering-your-video-shots/ https://superuser.com/questions/1025794/merge-two-videos-...
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  • 61
5 votes

Sync separate audio to video+bad-camera-audio, free NLE recommendations

I tried kdenlive, so I'll post my findings about it as an answer. It didn't quite do the job, so I'm not going to mark this as the accepted solution. kdenlive easily imports my clips in mjpeg+pcm, ...
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  • 2,628
5 votes
Accepted

By how much can video and audio be out of sync?

There are, in fact, several standards on audio/video or lip sync. The problem is, they can't all agree on what the acceptable error is. What is well understood is that if the audio lags the video it ...
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4 votes

Recording video's with two cameras?

I've had my fair share of matching. C100 with 5D MK III, 5D MK III with 7D, 7D with C100, 7D with a Sony Camcorder. It's all a matter of getting two cameras that are similar in terms of resolution ...
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  • 799
4 votes
Accepted

What is the best way to plan and sync voiceover?

In addition to @Mulvya answer I will suggest to use not Flash, but After Effects for animation, if possible. Then you will be able to make Dynamic Link to your AE project. Than will be easier to jump ...
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  • 1,729
4 votes

Sync several movie clips with one audio file

This sounds like a perfect candidate for using multi-camera editing. You can automagically synch all the clips using their audio, and turn them into a multicam source, which lets you edit from the ...
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  • 13.4k
3 votes

How can I record audio & video synced with another audio file?

You are over thinking it. Edit a quick beep in before the audio starts on the song, play the song aloud while you are recording the drums. Hit one of your drums so that you can see and hear it ...
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  • 19.2k
3 votes
Accepted

Sync Video to Audio in SonyVegasPro13 with multiple anchors

Short Answer Split your Video track into separate Events; Adjust the Events individually by dragging them along the timeline and stretching/expanding them; Overlap the adjacent Events so that there ...
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3 votes

How do I match the audio and video streams in my video file with the audio I recorded separately?

You could try processing the audio first to get it to the same speed as the video playback. Using (for example) Audacity you can apply a speed change of -0.1% (1000/1001) which is very likely the ...
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  • 4,654
3 votes

Low cost frame synchronized (genlocked) 3D stereo camera

You probably will not achieve a 100% perfect result with your setup. That you got them synced to a 1FPS accuracy is pretty amazing actually. Professional stereo setups use frame locking in hardware ...
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  • 7,099
3 votes

What is the best way to plan and sync voiceover?

If the audio is primary and the visuals convey or complement the narration, then record the audio first. Use the audio timings to guide the pacing of your animations - if some demo takes longer than ...
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  • 30.2k
3 votes
Accepted

Is it possible to capture video signal waveform as audio for video replay?

The short answer to your question is "no". The sample rate of video is typically measured in MHz or GHz. If you have a 1080p24 signal at 8 bits per pixel, the actual frame is 2750 x 1125 pixels (...
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3 votes
Accepted

Syncing audio and video from different sources

This is a rather common problem. The issue is NOT sample-rate. And the issue is NOT frame-rate, either. Most modern editing software (or file-manipulation software) is capable of easily resolving ...
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3 votes
Accepted

Audio without video is OK, but WITH video it is delayed

You've to reset the timestamps: [1:a]atrim=start=2.52:end=1:38.0,aloop=100:7700,asetpts=N/SR/TB[audio]
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  • 30.2k
3 votes
Accepted

OBS Studio: desktop audio falls out of sync

So with everything I've tried I'm not sure if I messed anything up, but.... Turning off "Use device timestamps" in the properties of "desktop audio" fixed the problem.
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  • 141
3 votes

What causes audio sync drift when digitizing VHS?

Audio drift can have a couple of causes, dropped frames (which a TBC can help with), and unstable clocks, where the audio isn't recorded at quite the precise rate it should be, causing drift, as ...
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2 votes

Does the Sampling Rate affect the syncing process to a video source?

You can tell which one gets out of synch like this: Set up your camera and your phone like you usually do. Put a clock that shows seconds right in front of the camera. Then, even though this sounds ...
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  • 1,589
2 votes

Sync separate audio to video+bad-camera-audio, free NLE recommendations

Try Blender's Video Editing. If Video and audio where recorded at the same time it will be easy to sync them, just be sure your video frame rate is correctly set in Blender and that you check synced ...
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  • 297
2 votes

Syncing Shogun Footage with PluralEyes?

I am on Premiere CC 2015, which has its own PluralEyes equivalent for synchronizing audio under the "Merge" function. (I think it was also on CC 2014 but I am not sure what version originated audio ...
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  • 21
2 votes
Accepted

link multiple audio tracks to one video track in Premiere CC

You can link multiple clips as you would link two clips. First, put all the audio and video tracks you want in your timeline and arrange them using the timecodes, manual adjustments or however you ...
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  • 5,382
2 votes

Negative SMPTE timecode drop-frame handling?

I know this is a very old Q, but it should be pointed out that a 'negative timecode' makes no sense. The SMPTE frame before 00:00:00:00 is 23:59:59:29. The namespace for drop frame (and non-drop) ...
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  • 4,654
2 votes

Millisecond stopwatch for visual stereo video synchronization measurement

You can only sync video to an accuracy of a frame, or somewhere in the area of 15-40 mSec depending on frame rate. So as long as whatever you're shooting can update and refresh at least that quickly, ...
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  • 4,654
2 votes

GoPro Dual HERO 3D stereo system only compatible with HERO3+ Black Edition units?

I probably could have done a quick google search before asking. HERO3+ Black Edition may be the only currently selling supported unit, but I found that following historical products are compatible ...
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  • 210
2 votes
Accepted

Premiere CC 2015 and DVD conversion audio sync issue

Based on your comment feedback, and as I suspected, it looks as if the main audio has 'slipped under' the new title video. An easy way to avoid this is to marry the titles with a silent audio track.
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  • 4,654
2 votes

Premiere CC 2015 and DVD conversion audio sync issue

Make sure your video has the same fps as the original video, usually it's 25/29fps. It could also be the format that you're exporting it to.
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2 votes

How to sync the dubbed audio to original video?

I've had the same problem where the video and audio were compressed separately and came out with as two different lengths. Even just a half second difference will mean that the audio at the end of ...
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2 votes
Accepted

How to sync motion and music in After Effects

Depends on how much time stretch is key to synchronize the shot. In order to increase the speed of the whole layer use the Time Stretch feature (Right Click the Layer > Time > Time Stretch) Note: ...
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  • 2,269
2 votes

Losing audio/video sync in Adobe Premiere with mp4's

I had the same issue on Windows 10 with a Variable Frame Rate (VFR) video recorded using Shadowplay. Here's how I fixed it without requiring to convert the video using Handbrake or any other converter:...
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