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  • How to make trimmed video start on a keyframe at 0:00 ?

    23 mai 2021, par throwaway513

    I am trying to make my video start at 0:00.0 but it doesn't work ?

    


    First I find the keyframes of my video using :

    


    ffprobe -loglevel error -skip_frame nokey -select_streams v:0 -show_entries frame=pkt_pts_time -of csv=print_section=0 input.mp4

0.000000
8.308308
9.743076
10.710711
19.019019
21.054388


    


    I use this to trim it to start at 19 secs

    


    ffmpeg -i input.mp4 -ss 00:00:19.019019 -t 00:00:10 -c copy output.mp4


    


    But the video starts at 00:00:02.0350, which is the next key frame (19+2=21).

    


    To get it to start at the closest point to 0 at 19 secs I go back two previous frames

    


    ffmpeg -i input.mp4 -ss 00:00:18.952285619 -t 00:00:10 -c copy output.mp4


    


    Which the output video starts at 00:00:00.065982649 on 19.019019 as the first frame.

    


    How come I can't make the video start at 00:00:00.00 on the key frame without re-encoding ?

    


  • How to make timelapse with ffmpeg from files with date-time names ?

    4 novembre 2019, par LA_

    I understand how to make timelapse video from the sequence of files.
    But what if my files have names like YYYYMMDDHHmmSS.jpg ? How can I pass them in the correct order ? I would prefer not to rename them (there are 55’000 files, almost 10 Gb).

  • movenc : Make sure the RTP hint tracks have nondecreasing DTS

    7 juillet 2013, par Martin Storsjö
    movenc : Make sure the RTP hint tracks have nondecreasing DTS

    The RTP timestamps can be decreasing for codecs with B-frames. For
    
these cases, make sure the timestamps in the MP4 file track itself
    
are nondecreasing, and add an offset to the RTP packet hint instead
    
to produce the intended RTP timestamp.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] libavformat/movenchint.c

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