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conversion - Synchronizing audio and video using MP4Box ...
https://superuser.com/questions/35896/synchronizing-audio-and-video-using-mp4box-ffmpeg-to-concatenate-files
For correct synchronization you have to write the MP4Box command as follows: MP4Box -add file1.mp4 -cat file2.mp4 -new output_file.mp4. instead of using -cat use -add before the first video. The remaining options are correct and you can put -new before the output video parameter. Share.
Audio Sync issues using various MP4Box tools - VideoHelp
https://forum.videohelp.com/threads/362735-Audio-Sync-issues-using-various-MP4Box-tools
Audio Sync issues using various MP4Box tools + Reply to Thread. Results 1 to 7 of 7 Audio Sync issues using various MP4Box tools. Thread Tools. Show Printable Version; ... trying to put an FLV file in an MP4 container i extracted using FLVExtract i have tried yamb and mymp4box and each time audio is out of sync
Audio gradually goes out of sync when playing files ...
https://github.com/gpac/gpac/issues/287
I use MP4Box on Ubuntu 12.04 64-bits to repackage TS files into MP4 files like this: $ MP4Box -add in.ts out.mp4. A problem occurs with files obtained from a specific source. After being repackaged, the audio gradually goes out of sync. At the beginning audio is in sync, but after 5-10 minutes it's out of sync by one second.
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.
mp4box man page - gpac - General Commands | ManKier
https://www.mankier.com/1/mp4box
mp4box - Man Page. GPAC command-line media packager. Examples (TL;DR) Display information about an existing MP4 file: mp4box -info filename Add an SRT subtitle file into an MP4 file: mp4box -add input_subs.srt:lang=eng -add input.mp4 output.mp4 Combine audio from one file and video from another: mp4box -add input1.mp4#audio -add input2.mp4#video output.mp4 …
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
The sync will depend on how well you do this. • Reduce the volume to zero of the required part of the top (video audio) track by editing that track in Audacity. • Export this new mix as an .m4a file from Audacity (Follow the ffmpeg instructions in Audacity if necessary) • Open MP4BoxGUI and select 'Demux'.
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