Dana 29. 8. 2015. 01:40 osoba "Jesper Taxbøl" <jes...@taxboel.dk> napisala je: > > Hi Guys, > > I am trying to sync two videos recorded simultaniously from a stereo setup. > > I am extracting their audio (mono) and find their offset, which I can > easily find in Audacity. With the offset in hand I cut off the start of > the earliest video, so they start at the same time. I use the -ss flag for > this. > > ffmpeg -ss 0.75 -i A.mp4 -acodec copy -vcodec copy cut_A.mp4 > > > Hereafter I assemble them side by side into one video using a complex > filter. > > I am however having trouble with their syncronization in the end product. > > I am therefore wondering if the -ss flag is the right way to do this or if > I can achieve syncronization between the videos a different way? >
You can use trim filter to trim to exact frame, but you cannot use it with -c copy. > I suspect the -ss method is affected by where there are keyframes in the > video as I constantly get it wrong more than a second. > > All ideas are welcome. > > Kind regards > > Jesper > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
