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Questions tagged [sync]

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Offsets in HLS video segments

I am streaming video from a camera to a process that monitors the stream for specific events. I am able to connect to the camera, download the m3u8 playlist, fetch the individual AVI video segments ...
A_A's user avatar
  • 101
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0 answers
12 views

Galaxy A03s Not Recording at 30 FPS Constant - Mouth Movement and Audio Out of Sync

I have an unlocked Samsung Galaxy A03s [1]. Per the Samsung website, it's supposed to be specked at FHD (1920 x 1080)@30fps. Unfortunately, I almost never get it to actually record at 30fps constant. ...
Shawn Eary's user avatar
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0 answers
10 views

How to synchronize multiple Video Clips based on background music

I’m working on a dance video project where there are multiple clips of people dancing to the same song. I want to synchronize these clips so that they match the beats of the music. How can I achieve ...
Tschareck's user avatar
  • 530
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0 answers
46 views

Downloading an HLS stream: ONLY in sync when downloading with ffmpeg. Possible explanations?

I'm trying to download a livestream that is just a plain hls with no encryption. I usually use streamlink, but this site I'm trying to use recently doesn't output a correct video/audio synced output ...
R.JEON's user avatar
  • 1
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0 answers
85 views

Synchronize 2 IP camera RTSP Streams

So we have 2 IP camera RTSP streams that we are saving to disk. At some point we stop the recording on both streams and go back to N frames in each video. The problem that we are facing is that the ...
Marib Sultan's user avatar
0 votes
1 answer
47 views

Why can't I render these videos without audio being out of sync?

I've pulled out all guns to merge 13 episodes into one video, failing and staring at a brick wall. I've rendered on KDenlive in Linux and Davinci Resolve on Windows. I even screen recorded the whole ...
progonkpa's user avatar
  • 113
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0 answers
15 views

Can't understand the synchronise function for SMPTE/Vegas

I've tried to understand how to manage SMPTE sync in Vegas. For that, i've generated and recorded one SMPTE track in a dawn, then i've cut some part of it at various time, export it as wav file and ...
user42045's user avatar
1 vote
1 answer
39 views

2 video files, one has the audio with 15FPS, the other has the video with 5FPS, audio is out of sync

I'm trying to sync the audio and video of 2 different files, one is a 15 FPS webcam stream with audio and the other is a screen share with 5 FPS. This is an educational setting. I'm trying to do the ...
user5688333's user avatar
0 votes
1 answer
43 views

Syncing hard-coded text with audio

Perhaps too basic for this forum... but it might help someone in the future. I want to make translated lyric videos, with the lyrics hardcoded onto the video (English on top, my translation in my ...
maliebina's user avatar
  • 101
1 vote
1 answer
71 views

How to be sure of the FPS needed for any given export?

Sorry, my question is not very well put out but I have trouble understanding my own problem. I'm currently working on a music video project where I need to put green screened actors in a CGI scene. ...
the meedows's user avatar
3 votes
1 answer
2k 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 \ ...
xpt's user avatar
  • 195
2 votes
1 answer
99 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. ...
Andrew Straw's user avatar
1 vote
0 answers
602 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 -...
Stephen Rogers's user avatar
2 votes
1 answer
55 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?
antuK3n's user avatar
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0 votes
1 answer
377 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 ...
Uko's user avatar
  • 111
1 vote
1 answer
205 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 ...
user610620's user avatar
2 votes
3 answers
8k 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 ...
pkamb's user avatar
  • 127
1 vote
0 answers
15 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 ...
clankill3r's user avatar
1 vote
0 answers
125 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 ...
Greendrake's user avatar
0 votes
0 answers
552 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 ...
ameotoko's user avatar
0 votes
0 answers
71 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 ...
invider's user avatar
  • 101
0 votes
3 answers
1k 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 ...
L4ucky's user avatar
  • 1
1 vote
1 answer
118 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 ...
Jim DeLaHunt's user avatar
1 vote
1 answer
113 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. ...
3MP The Rook's user avatar
0 votes
1 answer
627 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 ...
sba923's user avatar
  • 101
1 vote
0 answers
244 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, ...
eybmv's user avatar
  • 11
-1 votes
1 answer
23 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 ...
nothingIsMere's user avatar
0 votes
1 answer
930 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 ...
emonigma's user avatar
  • 149
2 votes
2 answers
645 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 ...
Scott's user avatar
  • 133
0 votes
3 answers
617 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 ...
Jérémy's user avatar
  • 101
0 votes
1 answer
3k 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 ...
emonigma's user avatar
  • 149
0 votes
2 answers
1k 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 ...
anuswara's user avatar
2 votes
2 answers
2k 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 ...
AntumDeluge's user avatar
1 vote
0 answers
188 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 ...
Sandburg's user avatar
  • 111
1 vote
1 answer
472 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 ?
SebMa's user avatar
  • 175
1 vote
1 answer
7k 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 ...
Grzegorz Adam Hankiewicz's user avatar
4 votes
1 answer
6k 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 ...
iter's user avatar
  • 281
1 vote
1 answer
1k 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 ...
user3643's user avatar
  • 2,306
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 ...
nmu's user avatar
  • 230
1 vote
0 answers
343 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 ...
user3384674's user avatar
2 votes
3 answers
4k 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 ...
iter's user avatar
  • 281
19 votes
4 answers
60k 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 ...
shafi's user avatar
  • 343
0 votes
1 answer
517 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. ...
tycrek's user avatar
  • 129
2 votes
0 answers
900 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 ...
acker9's user avatar
  • 131
0 votes
1 answer
592 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 ...
markb's user avatar
  • 137
2 votes
0 answers
47 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 ...
evn's user avatar
  • 81
10 votes
1 answer
12k 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 ...
Alessandro Amato del Monte's user avatar
1 vote
2 answers
14k 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 "...
xyious's user avatar
  • 141
1 vote
1 answer
3k 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) ...
ninbura's user avatar
  • 121
3 votes
1 answer
846 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 ...
Cloud's user avatar
  • 133