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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#:~:text=If%20you%20need%20to%20delay%20audio%20by%203.84,2012%20will%20suffice.%20Explanation%20-itsoffset%203.84%20-i%20%22movie.mp4%22
Add audio (with an offset) to video with FFMPEG - Stack ...
https://stackoverflow.com/questions/7426179/add-audio-with-an-offset-to-video-with-ffmpeg
I couldn't get audio to offset properly either, and some searching suggests that -itsoffset is currently broken. You could try and get/compile an old version of ffmpeg before it broke (which doesn't sound like much fun). Alternately, you could pad your audio with the necessary silence using something like sox and then combine:
Add audio (with an offset) to video with FFMPEG
https://ask4knowledgebase.com/questions/7426179/add-audio--with-an-offset--to-video-with-ffmpeg
Using FFMPEG, how can I add the the audio to the video but specify a 500 seconds audio offset (So that they sync up)? EDIT: Down the bottom of this page it suggests how to specify an offset. $ ffmpeg -i video_source -itsoffet delay -i audio_source -map 0:x -map 1:y ..... However, when I apply this, it still starts the audio from the start.
FFMPEG Offset Audio – Uly.me
https://uly.me/ffmpeg-offset-audio/
FFMPEG Offset Audio. by Ulysses · Jun 19, 2020. If your audio is out of sync, you can fix using ffmpeg. ffmpeg -i source.mp4 \ -i livestream.mp4 \ -map 0: 0 -map 1: 1 \ -acodec copy \ -vcodec copy \ -itsoffset 0.100 \ output.mp4.
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/
The “itsoffset” in the above example is placed before file 1 (remember that linux counts from 0, so 0 is the first and 1 is the second), so when the mapping happens, it says “Take the video of file 0 and the audio of file 1, leave the video of file 0 alone and apply the offset to the audio of file 1 and merge them into a new output file”.
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
Using the capabilities of map option.You first need to find the index of the desired audio stream in the input file using any of these commands: ffprobe.exe "input_file.mp4" or ffmpeg.exe -i "input_file.mp4" Let's suppose that the index of the audio stream to be delayed is 2 (i.e. the third stream) and that the delayed input is the second one (as in my example).
ffmpeg - Trim audio file using start and stop times - Unix ...
https://unix.stackexchange.com/questions/182602/trim-audio-file-using-start-and-stop-times
ffmpeg seems to have a new option -to in the documentation:-to position (input/output) Stop writing the output or reading the input at position.position must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual.-to and -t are mutually exclusive and -t has priority.
Useful FFmpeg Commands for Working with Audio and Video ...
https://www.labnol.org/internet/useful-ffmpeg-commands/28490/
You can change the speed of your video using the setpts (set presentation time stamp) filter of FFmpeg. This command will make the video 8x (1/8) faster or use setpts=4*PTS to make the video 4x slower. ffmpeg -i input.mp4 -filter:v "setpts=0.125*PTS" output.mp4 20. Speed up or Slow down the audio
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