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mp4box man page - gpac - General Commands | ManKier
https://www.mankier.com/1/mp4box#:~:text=Combine%20audio%20from%20one%20file%20and%20video%20from,conversion%2C%20splitting%2C%20hinting%2C%20dumping%2C%20DASH-ing%2C%20encryption%20and%20others.
conversion - Synchronizing audio and video using MP4Box ...
https://superuser.com/questions/35896/synchronizing-audio-and-video-using-mp4box-ffmpeg-to-concatenate-files
MP4Box -cat file1.mp4 -cat file2.mp4 output_file.mp4 This works and the output file is playable, but on playback in Quicktime or VLC the second video's audio starts too soon, making the entire second part of the concatenated file out of sync.
MP4box moves the video stream by 67ms causing AV …
https://github.com/gpac/gpac/issues/648
Before running mp4box, I demux the audio and video streams using ffmpeg and use MP4Box to dash the streams separately. MP4Box does not change the pts and dts of audio stream but sometimes, MP4Box adds the 67ms offset to the video stream. When it does, there is an AV sync issue when I put the audio and video MPDs together.
[all variants] Remuxing with MP4Box, audio video out of …
https://ubuntuforums.org/showthread.php?t=2027758
I have an .mkv video file containing H264 video and AC-3 audio, which I wanted to remux for playback on a playstation 3. I extracted the tracks using mkvextract, converted the audio to AAC using FFmpeg, and remuxed it to .MP4 using MP4Box. Now the audio and video are out of sync, and it gets worse as it goes on, so remuxing it with MP4Box with an audio delay …
replacing (and syncing) an audio track of an MP4 video ...
https://forum.videohelp.com/threads/381715-replacing-(and-syncing)-an-audio-track-of-an-MP4-video-file
Never had any problems with sync doing that. Mp4Box does not convert anything, so the video must be as the original - it can only be the edited audio that's wrong. Don't forget to use the video audio track as the 'master' length. So the added 'new' audio track must be shorter so that it's the original audio track ...
Video/audio out of sync during play · Issue #996 · gpac ...
https://github.com/gpac/gpac/issues/996
Adding the repetitions of the loop on MP4Box as -dash-live the delay increases (only on safari) and becomes noticeble after some repetitions (audio before video). Resample audio stream to match the timestamp during concat process with aresample ffmpeg audio filter fix the issue. Now it is in sync with all common browsers!
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