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Sur d’autres sites (7874)

  • avformat/segafilmenc - set keyframe bit correctly

    5 mai 2018, par Gyan Doshi
    avformat/segafilmenc - set keyframe bit correctly

    As per
    
https://web.archive.org/web/20020803104640/http://www.pcisys.net:80/~melanson/codecs/film-format.txt,
    

    the top bit of the info1 chunk is set as 1 for inter-coded frames and 0
    
otherwise.
    • [DH] libavformat/segafilmenc.c
    • [DH] libavformat/version.h

  • ffmpeg combined video increaes duration

    4 septembre 2022, par Imants Gulbis

    I am splitting video file in scenes and then process them. After processing and combining them I gain a lot of extra seconds. Original duration 24:29 after combining 24:59.

    


    First I split video with this command

    


    ffmpeg -i test.mkv -f segment -c copy -map 0 -y $HOME/Encoding/SPLIT/OUTPUT-%07d.mkv


    


    And then I process each file encoding x264 to AV1 :

    


    ffmpeg -i $HOME/Encoding/SPLIT/OUTPUT-0000125.mkv -map 0:0 -pix_fmt yuv420p10le -strict -1 -f yuv4mpegpipe /tmp/fifo_stream

SvtAv1EncApp -i /tmp/fifo_stream --profile 0 --preset 6 --qp 35 --max-qp 63 --min-qp 1 --rc 0 --keyint 240 --input-depth 10 --crf 30 --rc 0 --passes 2 --film-grain 0 -b $HOME/Encoding/CONVERTED/OUTPUT-0000125.ivf


    


    and store information about every converted file in $HOME/Encoding/list.txt file

    


    Then I combine files :

    


    ffmpeg -f concat -safe 0 -i $HOME/Encoding/list.txt -y $HOME/Encoding/encoded.mp4


    


    result video gained extra 30 seconds. Someone knows what to do so that combined file duration will be same as original ?

    


  • cutting multiple segments with ffmpeg [duplicate]

    13 juin 2018, par B Pulsart

    This question already has an answer here :

    So there is a 10 min long .mp4 and I have to cut it in 2 seconds long segments every 10 seconds, then concatenate all 2 sec segments together to get a 2 min long film.

    I manage to do that with a loop in python that subprocep ffmpeg, but it’s long and ugly (cut, cut cut... and then glue)

    Is it a way to do that with just a line in ffmpeg ?

    my code in python for cutting sequences :

    import subprocess# as sp
    

    
ffmpeg = file on disk # on Windows
    
film_in =  a file name
    

    
t_total = 10#min
    
t_sec = t_total*60
    

    
def c_cut(time) :
    
    cmd = [ffmpeg  , '-i' ,film_in ,'-b:v', '800k' ,'-ss', str(time) , '-t','2' , '-an', film_out]
    
    return cmd
    

    

    
for tps in range(0, t_sec, 10) :
    
    film_out = a file name unique for each segment
    
    command = c_cut(tps)
    
    subprocess.call(command)

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