Questions tagged [sync]

Abbreviation for synchronization

Filter by
Sorted by
Tagged with
0 votes
0 answers
8 views

Is it possible to play an audio and a video file simultaneously in full screen mode and synchronize them?

I'm wondering if it's possible to play an audio and a video file simultaneously in full screen mode and synchronize them. I need a temporarily solution in order to avoid to create a new file (this is ...
user avatar
0 votes
0 answers
24 views

Flowframes: Re-Sync Audio to Video

i'm using Flowframes for interpolating Videos which works pretty well. Unfortunately, the rendered video will have the audio slightly delayed. I tried fixing it with virtualdub, but didn't work. Is ...
user avatar
  • 101
0 votes
0 answers
13 views

Estimating PTS offset to synchronize live audio and video

I have a live video and live audio input, however due to the camera and microphone they may incur variable amounts of latency before I receive the input for encoding. Unfortunately, the latency is ...
user avatar
  • 101
0 votes
1 answer
330 views

ffmpeg to cut subtitle file in sync with the cut video

I managed to cut the video and keep subtitle in sync by embedding the subtitles in the video: $ ffmpeg -i sample-mp4-file.mp4 -hide_banner \ -vf subtitles=subtitles.srt -ss 0:30:00 -t 1:33:31 \ ...
user avatar
  • 115
0 votes
0 answers
34 views

Video/audio unsynced after transcoding live rtmp video translation

Currently, I'm trying to create a live streaming service for internal purposes of my company; The scenario of work is pretty simple: We are receiving the RTMP stream from the user(over the internet) ...
user avatar
2 votes
1 answer
39 views

Is there a standard for multi-camera, high-speed video?

I develop an application to record from multiple high-speed (e.g. 200 fps) cameras simultaneously. Typically, the frame rate of these cameras is constant but this is not necessarily the case. ...
user avatar
0 votes
0 answers
84 views

ffmpeg -c copy vs -copyts vs -copytb etc & similar options? What's the overlap, differences, significances, pros cons, how, why & when TO/ NOT TO use?

ffmpeg -c copy vs -copyts vs -copytb etc & similar options? What's the overlap, differences, significances, pros cons, how, why & when TO or NOT TO use? ---------------------------- I am new ...
user avatar
  • 149
0 votes
0 answers
28 views

How can I record video over an existing video in an "overdub" fashion, keeping them perfectly in sync?

I am trying to figure out if there some way to for me to "overdub" video. What I mean by that is, I want to be able to record a video of me playing an instrument. Then I want to play back ...
user avatar
  • 1
0 votes
0 answers
13 views

Any software to record camera, audio interface and screen and sync them all at the same time? [duplicate]

This would basically save us all from the need for editing and stuff
user avatar
1 vote
0 answers
107 views

How to sync audio with kmsgrab video stream?

I am trying to sync audio from the pulse stereo output with the video from kmsgrab. If I use the video stream as stream one the video is choppy. The command that works best a the moment is: ffmpeg -...
user avatar
2 votes
1 answer
22 views

How to combine multiple audio tracks without sounding blasted?

Was going to make a combination of 9 covers of people singing the same song. I have it synced already and it is on sync, problem is its just sound like literal ear ache when played. How to fix?
user avatar
  • 21
0 votes
1 answer
74 views

Some parts have audio out of sync after a master export

I have a project in Final Cut Pro X, that plays as I expect in the Final Cut, but when I export in to h264 there is a part where audio is playing slightly in before the video. Such part is present on ...
user avatar
  • 111
1 vote
1 answer
89 views

How to automatedly synchronize video recording with pre-recorded music track?

When they film music videos ---ones that require the artist to lip sync in cooordination with a pre-recorded song--- do they synchronize the moment that the cameraman hits the record button on the ...
user avatar
2 votes
3 answers
3k 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 ...
user avatar
  • 127
1 vote
0 answers
14 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 ...
user avatar
1 vote
0 answers
102 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 ...
user avatar
0 votes
0 answers
330 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 ...
user avatar
0 votes
0 answers
21 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 ...
user avatar
0 votes
3 answers
896 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 ...
user avatar
  • 1
1 vote
1 answer
79 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 ...
user avatar
1 vote
1 answer
32 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. ...
user avatar
0 votes
1 answer
500 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 ...
user avatar
  • 101
1 vote
0 answers
189 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, ...
user avatar
  • 11
-1 votes
1 answer
21 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 ...
user avatar
0 votes
1 answer
719 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 ...
user avatar
2 votes
2 answers
519 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 ...
user avatar
  • 133
0 votes
3 answers
545 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 ...
user avatar
  • 101
0 votes
1 answer
2k 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 ...
user avatar
0 votes
2 answers
856 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 ...
user avatar
2 votes
2 answers
1k 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 ...
user avatar
1 vote
0 answers
129 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 ...
user avatar
  • 111
0 votes
1 answer
355 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 ?
user avatar
  • 155
1 vote
1 answer
6k 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 ...
user avatar
3 votes
1 answer
4k 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 ...
user avatar
  • 231
1 vote
1 answer
320 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 ...
user avatar
  • 1,999
1 vote
1 answer
3k 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 ...
user avatar
  • 230
1 vote
0 answers
162 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 ...
user avatar
1 vote
2 answers
2k 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 ...
user avatar
  • 231
13 votes
4 answers
37k 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 ...
user avatar
  • 163
0 votes
1 answer
161 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. ...
user avatar
  • 129
1 vote
0 answers
591 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 ...
user avatar
  • 121
0 votes
1 answer
463 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 ...
user avatar
  • 137
2 votes
0 answers
41 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 ...
user avatar
  • 81
8 votes
1 answer
8k 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 ...
user avatar
1 vote
2 answers
13k 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 "...
user avatar
  • 141
1 vote
1 answer
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) ...
user avatar
  • 121
3 votes
1 answer
347 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 ...
user avatar
  • 133
0 votes
1 answer
1k 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 ...
user avatar
  • 103
1 vote
0 answers
1k 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 ...
user avatar
  • 11
0 votes
1 answer
965 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 ...
user avatar