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Synchronize audio and video with FFmpeg - Geeky Hacker
https://www.geekyhacker.com/2020/05/17/synchronize-audio-and-video-with-ffmpeg/#:~:text=Synchronize%20audio%20and%20video%20with%20FFmpeg%201%20Fixing,we%20pass%203%20to%20-itsoffset.%20...%204%20Source
FFMPEG Fix Audio Sync – Uly.me
https://uly.me/ffmpeg-fix-audio-sync/
If you have a video with audio sync issues, you can easily fix it using ffmpeg. It takes 2 inputs: the filename and delay: 0.100 is 100 ms or 0.1 seconds. Output file has -fixed appended to it. It’s fast. Only takes 2-3 seconds to process a 1.5 hour recording. Here’s the script.
Can FFmpeg Sync Audio And Video? Solved!
https://videoconverter.wondershare.com/sync-audio/ffmpeg-sync-audio-and-video.html
When audio is ahead of the video, the -async option, when provided as -async 1, automatically corrects the start of the audio stream. Follow this syntax to sync the audio with the video. ffmpeg -async 1 -i input.mpg <encoding options> 3. Manually Correcting Time-Shift
Fixing audio sync with ffmpeg - Alien Pastures
https://alien.slackbook.org/blog/fixing-audio-sync-with-ffmpeg/
We now have the information to write a ffmpeg commandline which takes audio and video streams from the same file and re-assembles the movie with the audio stream delayed by 0.2 seconds. The resulting synchronized movie is called “synced.avi” and the conversion takes seconds, rather than minutes:
video - FFMPEG audio out of sync when transcoding ...
https://superuser.com/questions/1042988/ffmpeg-audio-out-of-sync-when-transcoding-demuxing-from-dv
FFMPEG audio out of sync when transcoding (demuxing) from DV. Ask Question Asked 5 years, 11 months ago. Active 1 year, 11 months ago. Viewed 30k times 3 4. I've been stuck with this problem for months. I have over 50 DV tapes (from and old Sony camcorder) to be converted to a more modern, usable format (most likely H264).
Audio Video Sync With ffmpeg - Stack Overflow
https://stackoverflow.com/questions/13902507/audio-video-sync-with-ffmpeg
ffmpeg -i input.avi -vn -ac 2 -ar 48000 -ab 448k -f mp3 audio.mp3. Then you need to divide the whole length of the video file (in seconds) by the actual length of the video stream (the time when the video stops and you can just hear the audio). You should get a number a little above 1 (1.12 or something like that).
Correcting for audio/video sync issues with the ffmpeg ...
https://wjwoodrow.wordpress.com/2013/02/04/correcting-for-audiovideo-sync-issues-with-the-ffmpeg-programs-itsoffset-switch/
Correcting for audio/video sync issues with the ffmpeg program’s ITSOFFSET switch Posted on February 4, 2013 The ffmpeg program has numerous “switches” that help to adjust and convert audio and video files.
Correcting for audio/video sync issues with the ffmpeg ...
https://tdngan.wordpress.com/2015/10/13/correcting-for-audiovideo-sync-issues-with-the-ffmpeg-programs-itsoffset-switch-2/
The delay is only .15 seconds. CASE 2: Video happens before audio (aka “need to delay video stream 0”): ffmpeg -i clip.mp4 -itsoffset 0.150 -i clip.mp4 -vcodec copy -acodec copy -map 0:1 -map 1:0 output.mp4. The “itsoffset” in the above example is placed before file 1.
conversion - In ffmpeg, how to delay only the audio of a ...
https://superuser.com/questions/982342/in-ffmpeg-how-to-delay-only-the-audio-of-a-mp4-video-without-converting-the-au
If you need to delay audio by 3.84 seconds, use a command like this: ffmpeg.exe -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 0:v -map 1:a -c copy "movie-audio-delayed.mp4" Make sure, that your ffmpeg build is not too old, newer than 2012 will suffice.
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