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Delay audio for a few seconds at the start of audio files ...
https://stackoverflow.com/questions/9643348/delay-audio-for-a-few-seconds-at-the-start-of-audio-files-using-ffmpeg
I have been trying to get lots of wav files delayed by 2 seconds at the start using ffmpeg. And so far, even though I have read the manual, I was not able to get it working. Here is my command: for %%A in (*.wav) do (ffmpeg -i "%%A" -itsoffset 00:00:02 "%%~NA"1.wav ) And nothing is being changed. Files are simply getting copied.
How to add offset or delay to audio file with ffmpeg?
https://stackoverflow.com/questions/52446539/how-to-add-offset-or-delay-to-audio-file-with-ffmpeg
It works in command: ffmpeg -vn -i 1.mp3 -i 2.mp3 -filter_complex "[a]adelay=2000|2000[a];[a][b]amix=inputs=2:dropout_transition=0" -q:a 1 -acodec libmp3lame -y amix_test.mp3, but when I try ffmpeg -i 3.mp3 -af adelay=100000|100000 delayed.mp3 it says At least one output file must be specified maybe you can say how specify output?
delay-audio-with-ffmpeg.sh · GitHub
https://gist.github.com/adrienjoly/e5b2db9c9a61f454ed08f56c32999f17
delay-audio-with-ffmpeg.sh. Raw. delay-audio-with-ffmpeg.sh. # use this command to add 5-seconds delay to the audio track of a video. #. ffmpeg -i input.mp4 -itsoffset 5 -i input.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy delayed.mp4. Raw.
Insert Audio Delay With ffmpeg - VideoHelp Forum
https://forum.videohelp.com/threads/346293-Insert-Audio-Delay-With-ffmpeg
To delay the audio: ffmpeg -i test.avi -itsoffset 0.216 -i test.avi -map 0:0 -map 1:1 -vcodec libx264 -r 25 -b:v 1268k -s 512x368 -acodec copy audio_delayed.mp4 To delay the video: ffmpeg -i test.avi -itsoffset 0.216 -i test.avi -map 1:0 -map 0:1 -vcodec libx264 -r 25 -b:v 1268k -s 512x368 -acodec copy video_delayed.mp4 Caveats;
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 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.
FFmpeg adding unwanted audio delay? : ffmpeg
https://www.reddit.com/r/ffmpeg/comments/rs2ddh/ffmpeg_adding_unwanted_audio_delay/
ffmpeg -i input.mp4 -i input.ac3 -map 0:v -map 1:a -c copy output.mp4 When I opened both my initial audio (input.ac3) and my final video (output.mp4) in Adobe Premiere and looked at the audio waveforms, I realized the the video had a 32ms audio delay compared to the original audio. I was able to replicate this with another set of files.
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.
FFmpeg Filters Documentation
https://ffmpeg.org/ffmpeg-filters.html
Set a delay, in seconds. The input audio is analyzed immediately, but audio is delayed before being fed to the volume adjuster. Specifying a delay approximately equal to the attack/decay times allows the filter to effectively operate in predictive rather than reactive mode. It defaults to 0. 8.72.1 Examples
video - FFMPEG audio out of sync when transcoding ...
https://superuser.com/questions/1042988/ffmpeg-audio-out-of-sync-when-transcoding-demuxing-from-dv
Here are three wildcard attempts at solving this issue: Method 1a Use system time as timestamps. ffmpeg -use_wallclock_as_timestamps 1 -i input.dv \ -c:v libx264 -b:v 4000k -c:a aac -b:a 128k -fflags +genpts method1.ts. Method 1b Use resampler with flag set to inject silence when input audio timestamps have gaps.
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