Questions tagged [sync]

Abbreviation for synchronization

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15 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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0answers
13 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
25 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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41 views

Syncing audios of two same videos of different framerates

I have two video files: High quality video / English voiceover Lower quality video / My language voiceover These 2 files contains same video, but has different times (one is usually 5% slower or ...
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0answers
17 views

Problem editing AVCHD in Shotcut - Windows

I'm editing a video in ShotCut, and it was stored in a AVCHD folder. I opened each MTS file and paste them next to each other. The problem is that there is like one second delay between each file. My ...
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2 views

Synchronize multiple video files and direct them to discrete monitors

I’d like to take 3 video files of a similar event (different perspectives) and play them simultaneously yet direct the videos to discrete monitors. Is that possible? Any guidance?
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3answers
30 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
75 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
195 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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0answers
8 views

Audio subtly out of sync with video - how to fix?

I have an MKV file that has an issue with the audio - it subtly lags behind the video. They start in sync, and then over the course of the whole clip they drift out of sync. My first idea was that ...
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0answers
8 views

Sync Audio - Varying Stretches and Shrinks

We have a 3 webcam setup, and a desk microphone. Each camera is recorded separately, and in post we are trying to show all 3 cameras at the same time, but use the audio from the desk mic for the ...
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0answers
196 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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7 views

How can I synchronise multiple tracks in Premiere Pro CS6?

I am recording an event using multiple digital sources: a camcorder (obviously with audio too), a recorder attached to the lapel microphone, another recorder with ambient microphone etc. There is a ...
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0answers
54 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
115 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
2k 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
985 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
37 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
590 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
86 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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1answer
380 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 ...
3
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3answers
10k 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
23 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
221 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
188 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
31 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 ...
3
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1answer
3k 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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1answer
3k 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
1k 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) ...
3
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1answer
108 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
633 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
612 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
385 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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0answers
212 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
83 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
155 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
2k 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
39 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 ...
4
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1answer
5k 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
222 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
1k 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
102 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 ...
1
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4answers
849 views

Sync several movie clips with one audio file

Have several video clips from DSLR with terrible sound, and one audio file from zoom. It was a bend concert. Zoom was recording all the time but clips are separated, as there were breaks from song to ...
2
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2answers
490 views

How is 29.97 timecode generated over a full day without frame errors?

A quick primer:American television was originally broadcast at 30 frames per second. In order to accommodate color information without losing backward-compatibility with B&W televisions, the ...
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0answers
891 views

Audio drift after uploading to YouTube?

I recorded myself playing some games and then uploaded the videos to youtube. I noticed that after youtube finished all processing and made multiple resolutions available that the audio and video ...
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1answer
497 views

how to synchronize text to the video timecode?

I am wondering how to add text which is updated along the time code of the video. Concretely, I have a gopro footage and a file of some performances values (speed, heart rate, cadence,...) that I ...
3
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0answers
87 views

Video and Telemetrics not in sync

I've recorded a video with Raspberry Pis Camera Module. On top of that I've recorded GPS data including the GPS Timestamp and made my own data file. Using Dashware I've tried to get the video and ...
3
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3answers
121 views

Is 0.0036% time inaccuracy on a consumer-grade camcorder expected?

I did an experiment on our church's camcorder (Sony Handycam HDR-CX380) recently to test whether it was the source of a time inaccuracy between our video recordings and PC audio recordings of sermons (...
2
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1answer
200 views

Identifying source of audio drift between camcorder and recording PC

I'm recording our church's sermons using a standard consumer-grade camcorder (Handycam HDR-CX380). Depending on mixer circumstances (our church moves around a lot), I'll either run a line from our ...
2
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1answer
53 views

Why is my Sony Alpha 6000 not synchronzing with other recorders?

Using a Canon 70D and a couple stand-alone audio recorders, I have no trouble matching footage between the different devices. With the Sony Alpha 6000, I can't line them up on the Premiere timeline: ...