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Sur d’autres sites (8416)

  • Merge videos with different start times and show them on a grid

    1er août 2017, par shamaleyte

    I have multiple video files of a conference call. However, each participant joined the call at a different time, which resulted in the fact that each video file has a different start time offset values.

    Video   Start Time
    
------------------
    
Video1  00:00
    
Video2  00:10
    
Video3  01:40

    My purpose is to play back this conference. However, I did not record the conference as 1 video, it is recorded with multiple video files, instead.
    How do I stitch these videos ?

    There is also a paid solution to merge video fragments to a single clip – this will make the client-side much simpler. But can I do it for free ?

    The expected outcome is to have one video showing three videos on a grid.
    When ffmpeg stitches the videos, it should consider their start time values properly so that the videos are played accordingly.

  • 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 !)

  • ffmpeg exact start and end times

    19 juin 2017, par Eng. M.Hamdy

    I’ve searched a lot but didn’t find what I nedd.
    I use this command :

    ffmpeg -ss <start> -i <srcfile> -t <duration> -c copy <dstfile>
    
</dstfile></duration></srcfile></start>

    to copy a part of the video, but the output file start time and duration may differ than "start" and "duration" specified.
    I understand that ffmpeg seeks to the nearest Keyframe and that precise seeking to a timestamp is not possible unless re-encoding the video (I tried that but the output video losses quality !).
    It’s important to me to know the exact start and end timestamp that ffmpeg use to generate the output, because I use this info to adjust subtitle timing.
    Is there any way to make ffmpeg report start timestamp and end timestamp ?
    Or else : Is there any way to know the previous and next keyframes to specific Timestamp, so I can adjust the video cut markers in my project to fit nearest keyframes ?
    Thanks.

    Update :
    - Is it possible to seek to the second keyframe, and to the keyframe before the last one ?
    - what is the time interval between 2 keyframes ?

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