Here is a link to the videos I am using to try and solve this problem: https://www.dropbox.com/sh/a7ia4ssy1dqtupy/AABX-3MoO-QqSiKgQKkkkTOba?dl=0
Also at that link is the python script I use to measure the clips' durations. To recap: I want to concat videos, but blank footage between them, *and* know the *exact* in-time for each video. It would be super if there were a way to make the in-times on a rounded second, but my ffmpeg-fu is not that strong. Help greatly appreciated! On Tue, Nov 29, 2016 at 5:46 PM, Erik Blankinship <[email protected]> wrote: > I've concatenated some videos (with audio tracks) together using ffmpeg's > filter_complex. Between each video is a blank video (black with silent > audio). > > #the blank video > ffmpeg -f lavfi -i color=c=black:s={w}x{h}:d={duration} -f lavfi -i > aevalsrc=0:c=2:d={duration} {target_file} > #concat the videos > ffmpeg -i b.mp4 -i clip0.mp4 -i clip1.mp4 -i clip2.mp4 -i clip3.mp4 > -filter_complex '[1:0] [1:1] [0:0] [0:1] [2:0] [2:1] [0:0] [0:1] [3:0] [3:1] > [0:0] [0:1] [4:0] [4:1] concat=n=7:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' > argh.mp4 -report > > Once created, the resultant video looks great and sounds great! > > Now I need to know the exact time or frame the videos are inserted into > the output file. > > My attempts to sum up the durations of the clips which were used to make > the output movie often leaves me off by one frame. > > I got the durations for the clips using ffprobe and have tried using the > audio durations, video durations, and the "format" durations. However, > whichever of the clip durations I sum to determine the inpoint of the clip > in the concatenated video is off by ~1 frame for some of the last clips :-/ > > What is the right way to solve this problem? Is there a better way to > construct my video so that I can accurately find the inpoints in the > concatenated video? > > (If it is helpful I can post the videos somewhere). > _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
