Questions tagged [sync]
Abbreviation for synchronization
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0answers
8 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 ...
-1
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0answers
16 views
Live multiple camera editing and capture for sports coaching
Use case:
Personal project to help a gymnastics studio develop a video system to review athlete movement.
Summary:
Capture feed from multiple cameras (ideally 4, front and back, left and right)
Have ...
0
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1answer
28 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 ?
0
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1answer
45 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 ...
1
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1answer
166 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 ...
1
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1answer
31 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 ...
1
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1answer
52 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 ...
0
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0answers
66 views
Encoding a MOV to MP4 with FFMPEG (pcm_s24le & h264 to acc & h264) results in different durations (due to audio priming?)
While encoding a QuickTime MOV file to MP4 where the original file has h264 video encoding and pcm_s24le audio decoding and the target has h264 video encoding and aac audio decoding results with ...
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0answers
61 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 ...
0
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0answers
56 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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2answers
3k 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 h264 video, the rtp packet doesnot have the timestamp, and we could observe audio video sync issue while playing ...
0
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1answer
20 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. ...
1
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0answers
112 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 ...
0
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1answer
92 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 ...
0
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0answers
10 views
recording and later synching both screen and speaker
My goal is to create educational videos that show a recording of my screen/mouse, and also show a small inset view in the corner of me speaking. My plan is:
Record the screen using a standard screen ...
0
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0answers
28 views
Fix a non constant desync?
I'm facing weird desync problems concerning two video inputs that are supposedly parallel.
The 1st input is a screen capture of an emulation.
2nd input is a video generated by the same emulator, but ...
1
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0answers
14 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 ...
0
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0answers
25 views
Adobe premiere pro cc lip sync - gets displaced overtime
I have a video recorded from camera, and the sound recorded from a good microphone separately. So I have a video file and an audio file in my project.
I mannually synced the clean audio to the video, ...
3
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1answer
1k 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 ...
1
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1answer
1k 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 "...
1
vote
1answer
654 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
68 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 ...
0
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1answer
475 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
406 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 ...
0
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1answer
219 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 ...
0
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0answers
144 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 ...
1
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3answers
60 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 ...
0
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0answers
572 views
ffmpeg won't sync audio after specifying rate
There are a thousand threads on audio sync problems but none of them had the solution for my case. I am recording videos on frame arrival as opposed to specifying a fixed rate. As a result I may get ...
0
votes
1answer
108 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 ...
0
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0answers
23 views
Synchronizing audio to video on a low-end notebook
is there any video software that will allow me to to synchronize externally recorded audio to video on a low-end computer? I do not plan on doing anything besides audio synchronization.
I know there ...
0
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0answers
42 views
How to fix virtualdubs audio resync pitch shift?
So, I recorded three camera angles yesterday for the first time with three instances of virtualdub. I didn't notice that there were some frames dropped until after about 2 hours of video were shot.
My ...
0
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4answers
955 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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0answers
36 views
How to burn a MKV to a DVD without audio sync issues using only open software
Using only open software, preferably something cross platform, I'd like to convert an MKV file I have for playback on a DVD on a standard player.
I've used software to do this before, but I keep ...
0
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1answer
36 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 ...
3
votes
1answer
3k 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 ...
0
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1answer
192 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
466 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 ...
1
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1answer
76 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
716 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
votes
2answers
423 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 ...
1
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0answers
760 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 ...
1
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1answer
398 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
votes
0answers
79 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
votes
3answers
99 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
140 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
45 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: ...
5
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1answer
571 views
Trying to sync audio in mpeg2 video whose video freezes first 8 seconds in playback
So I have a handful of old mpeg2 (.mpg) files with the following profiles as provided by ffmpeg (the timecodes on each are different):
Stream #0:0(eng): Video: mpeg4 (Advanced Simple Profile) (mp4v / ...
7
votes
3answers
701 views
What is the best way to plan and sync voiceover?
I'm working on an informational video which has some live action product shots, animation created in flash, a backgroud music track, and a voiceover track.
I've got total control over everything so I ...
10
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5answers
24k views
Losing audio/video sync in Adobe Premiere with mp4's
I have two videos to combine in Adobe Premiere. They play okay in a video player, but putting them into Adobe Premiere CS6 suddenly makes the audio unsynced with the video (even in the Source Monitor)....
3
votes
1answer
1k views
ffmpeg concatenation introduces video stutter but does not affect audio
I've gone through several different variants of this process and it always causes me problems. I've gotten it working sometimes but it doesn't seem to be consistent.
I have a video camera which ...
