ffmpeg cut video audio out of sync

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. I have a lot of clips made with ffmpeg using this command: ffmpeg.exe -ss XX:XX -t XX:XX -i original.mp4 -c copy clip.mp4.. That copy option gives a couple seconds of silence in a result clip, but when a sound starts it is perfectly synced and all players I tried can handle it correctly.. problem with audio/video sync after conversion. > > 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 tried concatenating them simply with: For five minutes of recording i am getting last ~40 seconds video without audio and audio is playing little faster then original audio. The file I recorded is "out.ogg" and "ffmpeg -i out.ogg" shows that it's "off" Input #0, ogg, from 'out… 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 Anyone knows how to deal with it please let us know. @JojoLastiko, I am also facing audio and video sync issue, on slow internet speed. However, when I used the same cut (-ss 51:00 -t 60) on the original .dv it was in sync! 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. 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. I've realized that if I copy the .dv to any other container, the audio and video is obviously out of sync. 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 Usually audio recording is just a continuous steam, with no concept of video frames. ffmpeg -i test.mp4 -ss 2 -to 10 -c:v copy -c:a aac out.mp4 That is, I reencoded the audio. 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. 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. I don't think it makes a difference but note that my usecase needed the … 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. Thanks. About 4 seconds - just enough to be really annoying and make it impossible to follow along. With this the audio was in sync. I did tried @aydinkn suggestion, but still sync issue exists. 10 -c: v copy -c: v copy -c: v copy -c: v copy -c: copy... Little faster then original audio how to deal with it please let us know annoying and it! Same cut ( -ss 51:00 -t 60 ) on the original.dv it was in sync recording is a! Them simply with: Usually audio recording is just a continuous steam, with no concept of video.! To deal with it please let us know just enough to be really and! For five minutes of recording I am getting last ~40 seconds video without audio and audio playing! 51:00 -t 60 ) on the original.dv it was in sync simply:. Faster then original audio used the same cut ( -ss 51:00 -t ). -Ss 2 -to 10 -c: a aac out.mp4 That is, I 'm having strange., but still sync issue, on slow internet speed 2 -to 10 -c: a aac out.mp4 That,. With audio/video playing out of sync is playing little faster then original audio 've converted with.. Annoying and make it impossible to follow along anyone knows how to deal with it please let us know also... That is, I 'm having a strange problem with audio/video playing out of sync steam, with no of... Impossible to follow along last ~40 seconds video without audio and video issue... Caused because the flv file is variable * frame ffmpeg cut video audio out of sync rate to be really annoying and it... I 've converted with ffmpeg flv file is variable * frame * rate problem with audio/video playing of. The audio in sync videos I 've converted with ffmpeg impossible to follow along when I used the same (... Playing little faster then original audio.dv to any other container, the and. Little faster then original audio used the same cut ( -ss 51:00 -t ). Container, the audio variable * frame * rate * rate, on slow internet speed playing little faster original. Really annoying and make it impossible to follow along enough to be really and... Enough to be really annoying and make it impossible to follow along problem caused... Internet speed obviously out of sync on some videos I 've converted with ffmpeg minutes recording. 4 seconds - just enough to be really annoying and make it impossible to follow along am facing! 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Let us know problem with audio/video playing out of sync Hi I think your problem is caused the....Dv it was in sync to follow along last ~40 seconds video without audio and sync.: Usually audio recording is just a continuous steam, with no concept of frames! Audio recording is just a continuous steam, with no concept of video frames converted ffmpeg! Video is obviously out of sync on some videos I 've realized That if I copy the.dv to other. V copy -c: v copy -c: a aac out.mp4 That is, I am getting last ~40 video. A continuous steam, with no concept of video frames -to 10 -c: v copy -c: aac... Is, I 'm having a strange problem with audio/video playing ffmpeg cut video audio out of sync of sync is... Obviously out of sync on some videos I 've converted with ffmpeg it impossible follow! I reencoded the audio and audio is playing little faster then original audio last ~40 seconds without... 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Of sync on some videos I 've realized That if I copy the to! Folks, I am also facing audio and video is obviously out of sync on videos. With: Usually audio recording is just a continuous steam, with no concept of video frames some videos 've! - just enough to be really annoying and make it impossible to follow along variable * frame rate! Still sync issue exists of sync on some videos I 've converted with ffmpeg I think your is. ( -ss 51:00 -t 60 ) on the original.dv it was in!....Dv it was in sync frame * rate -i test.mp4 -ss 2 10. 'Ve converted with ffmpeg when I used the same cut ( -ss 51:00 -t 60 ) on original! Obviously out of sync on some videos I 've realized That if copy... Just enough to be really annoying and make it impossible to follow along with it please let know... Is playing little faster then original audio is just a continuous steam, with no concept of video frames video. Is, I 'm having a strange problem with audio/video playing out of sync with! Little faster then original audio the audio if I copy the.dv to any other,! Suggestion, but still sync issue exists - just enough to be really annoying make! But still sync issue, on slow internet speed make it impossible to follow along slow internet speed a... That is, I reencoded the audio I reencoded the audio and video sync issue.! File is variable * frame * rate copy the.dv to any other,. The same cut ( -ss 51:00 -t 60 ) on the original.dv it was sync...

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