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  • How can I get consistent start times and durations when cutting a video using ffmpeg ?

    21 juillet 2017, par danvk

    I’m trying to slice up a 20 minute video into several 1 minute chunks following this approach, but getting remarkably strange results.

    I first tried writing a loop with -ss after -i.

    for m in $(seq 0 20); ffmpeg -i video.mov -ss $((60 * $m)) -t 60 -vcodec copy video.$m.1min.mov

    I get a mess of different “start” times and video durations :

    $ for f in *.1min.mov; do echo $f $(ffprobe $f 2>&1 | grep Duration); done
    
video.0.1min.mov Duration: 00:01:00.01, start: 0.000000, bitrate: 3014 kb/s
    
video.1.1min.mov Duration: 00:01:00.00, start: 0.012000, bitrate: 3002 kb/s
    
video.2.1min.mov Duration: 00:01:00.00, start: 0.012000, bitrate: 3002 kb/s
    
video.3.1min.mov Duration: 00:01:00.00, start: 0.011000, bitrate: 3002 kb/s
    
video.4.1min.mov Duration: 00:01:00.00, start: 0.010000, bitrate: 3001 kb/s
    
video.5.1min.mov Duration: 00:01:00.00, start: 0.010000, bitrate: 3002 kb/s
    
video.6.1min.mov Duration: 00:01:00.00, start: 0.009000, bitrate: 3003 kb/s
    
video.7.1min.mov Duration: 00:01:00.00, start: 0.009000, bitrate: 3006 kb/s
    
video.8.1min.mov Duration: 00:01:00.00, start: 0.008000, bitrate: 2999 kb/s
    
video.9.1min.mov Duration: 00:01:00.00, start: 0.007000, bitrate: 3003 kb/s
    
video.10.1min.mov Duration: 00:01:00.00, start: 0.007000, bitrate: 3002 kb/s
    
video.11.1min.mov Duration: 00:01:00.00, start: 0.006000, bitrate: 3002 kb/s
    
video.12.1min.mov Duration: 00:01:00.00, start: 0.006000, bitrate: 3005 kb/s
    
video.13.1min.mov Duration: 00:00:50.57, start: 9.438000, bitrate: 3004 kb/s
    
video.14.1min.mov Duration: 00:00:50.57, start: 9.438000, bitrate: 3003 kb/s
    
video.15.1min.mov Duration: 00:00:50.57, start: 9.437000, bitrate: 3004 kb/s
    
video.16.1min.mov Duration: 00:00:50.57, start: 9.436000, bitrate: 2998 kb/s
    
video.17.1min.mov Duration: 00:00:50.57, start: 9.436000, bitrate: 3004 kb/s
    
video.18.1min.mov Duration: 00:00:50.57, start: 9.435000, bitrate: 3005 kb/s
    
video.19.1min.mov Duration: 00:00:50.57, start: 9.435000, bitrate: 3004 kb/s
    
video.20.1min.mov Duration: 00:00:50.57, start: 9.434000, bitrate: 3001 kb/s

    If I instead move the -ss before the -i :

    for m in $(seq 0 20); ffmpeg -ss $((60 * $m)) -i video.mov -vcodec copy -t 60 video.$m.1min.mov

    then I get nice start times but variable lengths :

    $ for f in *.1min.mov; do echo $f $(ffprobe $f 2>&1 | grep Duration); done
    
video.0.1min.mov Duration: 00:01:00.01, start: 0.000000, bitrate: 3014 kb/s
    
video.1.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3003 kb/s
    
video.2.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.3.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.4.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3001 kb/s
    
video.5.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3001 kb/s
    
video.6.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.7.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3005 kb/s
    
video.8.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.9.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.10.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3007 kb/s
    
video.11.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3002 kb/s
    
video.12.1min.mov Duration: 00:01:10.00, start: 0.000000, bitrate: 3004 kb/s
    
video.13.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3003 kb/s
    
video.14.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3003 kb/s
    
video.15.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3005 kb/s
    
video.16.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3001 kb/s
    
video.17.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3004 kb/s
    
video.18.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3002 kb/s
    
video.19.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3006 kb/s
    
video.20.1min.mov Duration: 00:01:00.57, start: 0.000000, bitrate: 3001 kb/s

    What’s going on here ? How can I get videos with even durations and sensible start times ? Is something strange with my input video ? (I’m unable to share it, sorry !)

  • Révision 17517 : decaler d’1px le menu deroulant pour aligner sur le trait vertical

    25 mars 2011, par cedric -

  • Révision 18637 : lorsque la position d’un menu est negative, il faut commencer à compter à -1=der...

    25 octobre 2011, par cedric -

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