Questions tagged [sync]
Abbreviation for synchronization
112
questions
0
votes
1answer
31 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 \
...
0
votes
0answers
20 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) ...
2
votes
1answer
26 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. ...
0
votes
0answers
34 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 ...
0
votes
0answers
20 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 ...
0
votes
0answers
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
1
vote
0answers
32 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 -...
2
votes
1answer
20 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?
0
votes
1answer
27 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 ...
0
votes
0answers
9 views
Audio/Video "Drift" on Mac (even when recording them using separate apps)
I have an older version of Screenflow (ver 6.x) and I find that it's getting so that my videos are falling out of sync with the audio (only noticed this lately, not sure if it is tied to newer ...
1
vote
1answer
58 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
...
0
votes
0answers
13 views
Auto-combine and sync video of one file, with audio of another
⌘ On Mac, How do I automatically combine 2 files with similar video data, using:
1 file with good video,
1 with good audio,
and have them auto-sync via matching video frames?
📄 Provided files
Say I ...
2
votes
2answers
2k 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 ...
1
vote
0answers
13 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 ...
0
votes
0answers
87 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 ...
0
votes
0answers
248 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 ...
0
votes
0answers
17 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 ...
0
votes
3answers
730 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 ...
1
vote
1answer
75 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 ...
1
vote
1answer
21 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. ...
0
votes
1answer
457 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 ...
1
vote
0answers
179 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, ...
-1
votes
1answer
17 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 ...
0
votes
1answer
630 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 ...
2
votes
2answers
472 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 ...
0
votes
3answers
509 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 ...
0
votes
1answer
1k 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
793 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
...
2
votes
2answers
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 ...
1
vote
0answers
116 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
325 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 ?
1
vote
1answer
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 ...
3
votes
1answer
3k 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
vote
1answer
189 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
2k 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
140 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
2answers
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 ...
13
votes
3answers
30k 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
votes
1answer
111 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
vote
0answers
520 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
429 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 ...
2
votes
0answers
40 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 ...
8
votes
1answer
7k 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
2answers
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 "...
1
vote
1answer
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) ...
3
votes
1answer
259 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
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 ...
1
vote
0answers
948 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
940 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
327 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 ...
