I don't think it makes a difference but note that my usecase needed the … With this the audio was in sync. I tried concatenating them simply with: However, when I used the same cut (-ss 51:00 -t 60) on the original .dv it was in sync! @JojoLastiko, I am also facing audio and video sync issue, on slow internet speed. The audio is just being encoded/output via a continuous buffer, which will just dump out wherever it is up to you when you stop recording video frames - it is not uncommon for there to be more (or even less) audio in the file than is actually required for the corresponding video. Usually audio recording is just a continuous steam, with no concept of video frames. Thanks. As a follow-up on Video concatenation puts sound out of sync, I have 6 video clips where the audio is 200 ms shorter than the video.The last clip has a chair banging on the floor and serves to measure the total misalignment in the concatenation. Then I wanted to cut that file to a 1 minute segment starting at the 51st minute (-ss 51:00 -t 60), it was obviously still out of sync. > > I converted it to an MP4 using the command: > ffmpeg -i telecomcto.flv -c:v copy -c:a aac -strict -2 -b:a 64k -ar 44100 > -ac 1 telecomctotest.mp4 > > I have not figured out how to get the audio to be in sync with the video. I've realized that if I copy the .dv to any other container, the audio and video is obviously out of sync. Hi folks, I'm having a strange problem with audio/video playing out of sync on some videos I've converted with ffmpeg. I am trying to use ffmpeg and mencoder to slice a portion of my video out but the audio is always 2 seconds out of sync. For five minutes of recording i am getting last ~40 seconds video without audio and audio is playing little faster then original audio. If I use the -ss flag to cut off the beginning then the audio is out of sync (I also get the red message: Buffering several frames is not supported...) I found that if I convert the .wmv to .avi first (using FFMpeg as well) I don't get the audio sync problem when I convert the .avi to .flv ffmpeg -i bird.avs.MP4 -acodec copy -vcodec copy -ss 00:08:40 -t 00:01:00 test.mp4 mencoder -ss 00:08:40 -endpos 00:01:00 -oac copy -ovc copy bird.avs.MP4 -o test.mp4 Anyone knows how to deal with it please let us know. After trying a few random things, I managed to make the audio/video sync by changing the rate of the audio: ffmpeg -i witness.mov -af asetrate=48018 resampled.mkv The resampled.mkv has correct sync, but unfortunately the audio is shorter than the remaining video for a few seconds. The file I recorded is "out.ogg" and "ffmpeg -i out.ogg" shows that it's "off" Input #0, ogg, from 'out… Unfortunately when I viewed it, I saw that the video and audio were out of sync. > Hi I think your problem is caused because the flv file is variable *frame* rate. 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