Questions tagged [sync]
Abbreviation for synchronization
89
questions
0
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0answers
16 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 ...
0
votes
2answers
57 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
...
0
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0answers
6 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 ...
0
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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 ...
1
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0answers
99 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 ...
0
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0answers
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 ...
1
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0answers
43 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 ...
0
votes
1answer
75 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
754 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
vote
1answer
694 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
36 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
vote
1answer
311 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 ...
1
vote
0answers
70 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 ...
1
vote
1answer
210 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
votes
3answers
7k 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 ...
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
173 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
votes
1answer
137 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 ...
1
vote
0answers
22 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
votes
1answer
2k 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
vote
1answer
2k 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
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1answer
867 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
votes
1answer
91 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
votes
1answer
571 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 ...
1
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0answers
497 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
votes
1answer
326 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
votes
0answers
187 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
vote
3answers
74 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
votes
1answer
137 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
votes
4answers
1k 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 ...
0
votes
1answer
38 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
4k 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
votes
1answer
207 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 ...
1
vote
1answer
714 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
vote
1answer
91 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
vote
4answers
783 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
475 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
vote
0answers
836 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
vote
1answer
454 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
85 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
117 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
votes
1answer
168 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
votes
1answer
51 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
votes
1answer
608 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
751 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
votes
5answers
29k 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)....
4
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 ...
4
votes
1answer
116 views
Recording video's with two cameras?
I have started to make some videos and I want to add a second camera to get a different angle.
The main camera I have is a Nikon D7200.
I am looking at a secondary camera, but I am hesitant because ...
4
votes
2answers
75 views
Premiere CC 2015 and DVD conversion audio sync issue
Years ago, I transferred a video tape of a live band performance to DVD (using a Sony VHS/DVD RW machine that I no longer own). Yesterday, I edited an 8-minute clip from the DVD. The audio/video sync ...
3
votes
1answer
1k views
How to sync the dubbed audio to original video?
I have English movie Die hard in English having total length for example 1hour 30minute original time and dubbed movie length 1hour 28minute.how to equalize both audio.apparently it is impossible. how ...
