Video Production

Questions tagged [sync]

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Abbreviation for synchronization

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Auto-combine and sync video of one file, with audio of another

⌘ On Mac, How do I automatically combine 2 files with similar video data, using: 1 file with good video, 1 with good audio, and have them auto-sync via matching video frames? 📄 Provided files Say I ...
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2answers
259 views

What causes audio sync drift when digitizing VHS?

In the process of digitizing family VHS tapes, amateur video producers often encounter audio drift or skew where the audio track becomes out of sync with the video: It slowly dawned on me that the ...
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0answers
12 views

Seeking for advice with dealing with out of sync audio

I have a bunch of videos from games caputured with NVidia's Share. They are trimmed using VLC. I have one video that is 1 minute and 38 seconds long (a lot longer then the others). If I play it in VLC ...
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42 views

How to compare the audio/video synchronization in video clips?

I have two video clips of the same music video. Both are made of the same video and audio tracks but of different sources and quality. One of them is a rip from an officially released media, so the ...
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11 views

Variable audio drift from screen captured VR project in Unity

I'm new to video editing, and I need to sync up the audio and video from two different sources for a Virtual Reality game. Basically, I have the VR itself running in Unity on one computer, with the ...
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106 views

Audio and video out of sync after hstack/amerge

I am using ffmpeg to combine two videos in one side-by-side. This is a recorded 1:1 video-call (WebRTC); each stream recorded separately by the media server. I've come up with this command, which ...
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0answers
13 views

Post-production editing audio/video out of sync

I am trying to add two videos using ffmpeg and the output video/audio is out of sync (and fast forwarded). Goal is to put intro.mp4 before the original file clip.flv My approach is to Change the ...
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3answers
82 views

How to solve audio/video sync issue on my mp4 screenrecording?

I'm relatively new to video editing and struggling to solve a problem whereas the video (i.e my lips) is out of sync with the audio (i.e my voice). The beginning of the video is fine but by the end ...
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1answer
47 views

How to automate sync of 80-120 audio clips recorded at home on mobile phones?

I want to produce a virtual choir recording of an amateur choir. I want to give 80-120 members of the choir an accompaniment/click track of some kind. They will record themselves, on their mobile ...
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1answer
19 views

syncing slideshow with music

So im currently creating a music oriented slideshow with a bundle of images that needs to be changed each beat of the music. Problem is, the music is 129 bpm which results in 2.15 beats per second. ...
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24 views

How do I synchronize 3 different videos playing through 3 projectors?

I am looking for help to find a software or device to play three different videos with three different screens/projectors in sync. Previously, I used 3 media players (devices) and played 3 different ...
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28 views

help trying to sync audio to a video

am trying to add the audio file that was extracted with Pazera Free Audio Extractor from the mkv files of source #1 to a video source #2 but i cant get it to sync. does anybody here know how to fix ...
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1answer
286 views

Fixing audio/video out of sync when editing recorded broadcast

I have recorded broadcast-ed material using a DVB-T tuner. That produces several TS files per recording (most likely to keep filesize within FAT32 limitations). I have concatenated each recording ...
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0answers
135 views

Adobe Encoder Desyncs Video/Audio (MTS to MP4)

I've been trying to transcode an MTS (recorded on a Panasonic) to MP4 with Adobe Media Encoder. The audio/video has consistently gone out of sync. I've matched the source, gone over all the settings, ...
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1answer
16 views

Absolute Beginner Looking to Produce a Primitive Music Video

I am a total beginner to video. I don't even know what kind of camera I'll be using. (I'll have to borrow one.) I am just looking for an overview of what the general process will look like. I have ...
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1answer
341 views

FFMPEG is not trimming the audio to the length of the video

As a follow-up on Video concatenation puts sound out of sync, I have 6 video clips where the audio is 200 ms shorter than the video. The last clip has a chair banging on the floor and serves to ...
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2answers
344 views

Sync picture in picture clips in Davinci Resolve

I'm trying to transition from Lightworks to Davinci Resolve. My question here is about the right way to sync 2 video clips and show them simultaneously. In my case I have a video of a sporting event ...
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3answers
258 views

Decrease FPS of too-high FPS video or increase FPS of too-low FPS video?

I created two videos of the same scene with two different cameras. The issue however is that camera 1 captured everything in 23.85 fps and camera 2 everything in 24 fps. Since I need to synchronise ...
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1answer
859 views

Video concatenation puts sound out of sync

I have several MOV files from a DSLR camera. I concatenate them with directions from this thread: ffmpeg -safe 0 -f concat -i files_to_combine -vcodec copy -acodec copy temp.MOV where ...
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2answers
596 views

Concatenating in sync MP4 (H264+PCM instead of AAC) from a Sony 2018 Camera

I downloaded these files (at max resolution 4K, that is important), in this order: https://vimeo.com/195782736 https://vimeo.com/196725716 https://vimeo.com/195776765 https://vimeo.com/196651176 ...
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1answer
738 views

FFmpeg: Align Video & Audio of Desktop Capture

I am using FFmpeg's built-in gdigrab & dshow to record the display & audio of my system. I am encoding to uncompressed H.264/AVC video & uncompressed PCM/WAV audio. I had been having two ...
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82 views

How to sync drifting audio(s)?

One audio source is the camera, (its sound is more for reference 'cause the distance is approximately 10 meters from the source). The second audio source is a mixing table getting mics. The total ...
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1answer
278 views

Lossless A/V delay with ffmpeg

I downloaded this video but its' audio has approximately a 600ms advance compared to its' audio. How can I fix that in a lossless manner (i.e -c copy) with ffmpeg ?
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1answer
5k views

Long video ffmpeg transcode makes audio go out of sync

I have recorded a 50 minute video, edited it in Hitfilm Express to censor/blur people, and exported it in Hitfilm's high resolution format, generating an 80GB file. When I try to transcode this file ...
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1answer
2k views

Add timecode information to file

I'm writing a program that interprets LTC timestamps from audio channels in video files. The goal is to remove the LTC track and replace it with some kind of native timestamps directly in the video ...
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1answer
72 views

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

If I have an interview or lecture style video and the audio is out of sync, by how much can it be out of sync before the average person would easily notice? I'm currently trying to create an HTML5 ...
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1answer
2k views

How do you batch merge many clips in a premiere pro timeline?

I'm sure there are other use cases for this as well, but the major one that I can think of is creating a bin out of the synced sequence pluraleyes creates. When pluraleyes syncs your footage with ...
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0answers
125 views

project 3 separate videos synchronized

For an art installation I need to set up a synchronized projection of 3 separate videos: hardware 1 PC with Windows 7 NVIDIA GeForce GTX 980 with 4 simultaneous outputs 3 projectors 1920 x 1080 (I ...
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2answers
1k views

Audio/video sync software for Linux (preferably open source)

I'm looking for a program that can synchronize audio and video from separate files. PluralEyes does this. I'm looking for something that runs on Linux and preferably is open source. I imagine a CLI ...
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3answers
21k views

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

I am using below command to push the video to Wowza server, since we are pushing raw H.264 video, the RTP packet does not have the timestamp, and we could observe audio video sync issue while playing ...
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1answer
57 views

How long should video clips be to be in sync with a 90 BPM song?

I am making a home vacation video set to music. The song I selected has a BPM of 90. I want the video clips to match the beat, so for example, every time you hear the beat a new video clip begins. ...
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0answers
381 views

Is there a container format in ffmpeg that supports non-monotonous timestamps?

I have recorded over-the-air digital TV broadcasts from my own antenna. Due to reception blips, the MPEG-TS file can have corrupted packets, and thus corrupted timestamps, in the middle of a ...
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1answer
326 views

SDI loop through with LTC embedder

I was wondering if there’s a converter out there that would take a HD-SDI in, as well as a LTC in, and an SDI out. We currently have video feeds with no timecode embedded and was trying to loop ...
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0answers
38 views

Synchronize Video / Audio with different numbers of audio channels

I have a main video recording and audio recordings from 2 phone-based lav mic's. One subject's lav recording has 2 audio channels and the other has 1. (The video also has 1 audio channel) I can ...
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1answer
6k views

Remove flickering due to artificial light with ffmpeg

I have video footage shot at shutter speeds of 1/30s under artificial light here in Europe where the AC is 50Hz. Flicker occurs -- obviously I should have used 1/25s or 1/50s but I didn't, and want to ...
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2answers
9k views

OBS Studio: desktop audio falls out of sync

I have an interesting problem: When I stream to Twitch (or record), my desktop audio goes out of sync with the video over time. The microphone is perfectly synced the whole time. Both OBS Studio and "...
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1answer
2k views

Syncing Multiple Audio Streams With One Video Stream (FFMPEG)

I'll try and keep this as simple as possible, and thanks for any help. I have two PC's one that I'm gaming on, one that I'm recording on. I also have two RME audio cards (one in each respective PC) ...
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1answer
153 views

Subtitles do not match spoken dialogue. Why?

I have been watching a lot of shows on Netflix lately in French, (please note the original language is English, so it is dubbed) with French subtitles. I find that the subtitles rarely match what is ...
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1answer
971 views

ffprobe/ffplay/ffmpeg command for checking audio/video sync

I'm working on a script that live streams 3 hours of video to several servers. Is there a command (or tool... maybe using something else like wireshark?) that I could run on each of the streams to ...
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0answers
823 views

How can I mux video and audio from separate sources that're at different frame rates?

I'm having trouble muxing the video from one source with the audio from another because the audio drifts over time. As I mentioned in the title, the sources are at different frame rates, the video's ...
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1answer
770 views

Imported video getting out-of-sync audio in Adobe Premiere

I have an MKV video with a few out-of-sync points caused, probably, by a 3rd-party program, used to remove some commercials from it directly from the MKV. So watched the video several times in VLC ...
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293 views

Is there command line software that syncs two audio tracks

I have a bunch of separately recorded audio and video tracks that I need to sync. By sync (synch?) I mean align the two tracks so that the audio matches as closely as possible. The two tracks are ...
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3answers
98 views

5 channel video installation

For my graduation project (a spatial documentary installation), I need to find a system to play 5 different video's simultaniously, all connected to a projector. So I have 5 projectors and 5 seperate ...
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1answer
170 views

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

I have this audio filterchain (for repetitive short part of the original audio): [1:a] atrim=start=2.52:end=1:38.0, aloop=100:7700 [audio] When I used it without video, i. e. in the ffmpeg command I ...
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4answers
4k views

Syncing audio and video from different sources

We recorded a video of a talk and its audio on separate devices (camcorder and phone). Both are relatively new an the camera indeed does nice full HD video. My problem is that they both seem out of ...
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1answer
42 views

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

I am an electronic musician. For artistic purposes, I want to be able to record a video signal to a .wav file and replay that signal into a TV as video. It seems like it should be simple--if I ...
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1answer
7k views

ffmpeg concat introduces a/v sync problem

I have one 2-hour video file and want to add a 10-second title sequence to its start. The long file has perfect a/v sync from start to finish. However, when I use ffmpeg -f concat -i mylist.txt -c ...
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1answer
294 views

Resynchronizing audio in a variable framerate video with missing timing data

I was recording a moderately long (20-30 minute) video when suddenly my camera died, resulting in a corrupt file. I was able to repair the file by following the steps in How to open and repair an m4v ...
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1answer
5k views

Audio goes a frame or two out of sync after export premier pro

i've finished my film and i'm trying to export my film in 1080p 23.976 fps , using h.264 audio acc 44.100 khz and 192 bit rate . when i export my full film my audio is slightly out of sync/time with ...
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1answer
123 views

Rolling shutter strobe pattern

I'm trying to implement a vision-based "lidar" system as described here: https://hackaday.com/2016/04/04/smartphone-and-ir-line-laser-measure-distance/ the idea is to capture video at 30fps and pulse ...

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