I tried watching some tutorial online about audio syncing but all of them just drag the track around without doing much.īusyearthen wrote:I have 200+ videos where I need to add an audio track and sync it.

Other than that, I'm not sure where do begin. Now, do you have any tips? I know shirt+R is Cut. I will need to cust and adjust the audio from file A I guess to align them properly. The duration is different but I know there are some black screen here and there in file B. I could keep both files but why do that when I can cut 500mb of disk space per video by keeping only the audio? Also it will be easier long term. I don't mind re-encoding audio track though as I was planning on using ffmpeg 'loudnorm' algo on it anyway. Can I use kdenlive to 'stretch'/'adjust' this? Can I do this without re-encoding the video? I want to preserve quality as much as possible. I have 200+ videos where I need to add an audio track and sync it. If I 'Align audio to reference' on Audio B (Audio A being the reference), the beginning are aligned properly. I synced up the beginning but noticed after 5 minutes the audio A was out of sync by a couple of seconds. I downloaded Kdenlive and imported both videos. If I play 2 videos side by side, most of the time I can get them in sync, but if I only copy the audio, it's out of sync. They sounds ok but they get out of sync with the video A. The video they were attached to are sometimes 23.975 fps or 30 fps, which is different from video A. The sound from batch B appear to be too fast or too slow.

Use ffmpeg to extract audio and copy it (maybe with a delay) to the batch B videos. I need to merge batch A audio with batch B videos.

Mkvtoolnix gui 25fps to 23.976