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• iterate through linex directory to apply same line of code

  25 juillet 2018, par J.D

  In my terminal (Linux), I have a directory of videos (001.mp4, 002.mp4 ... 300.mp4) that I want to split into frames using ffmpeg (ffmpeg -i 1.mp4 -vf fps=20 frame%04d.jpg -hide_banner). How can I apply this code to every video in the directory, specifically making the frames generated in a folder labeled after the video’s name (001.mp4 frames generated in a folder called 001). Running the code on a single video would generate the frames directly in that working directory. Note : the ffmpeg code must be changed to fit the filename each time.

• modify code of ffmpeg [closed]

  12 juillet 2012, par toutou0091

  Possible Duplicate :
  ffmpeg code changes

  To install FFmpeg, I followed the instructions in this web site http://buildall.wordpress.com/2011/05/09/how-to-compile-and-install-ffmpeg-in-ubuntu-11-04/ and it works well. In the file "mpegvideo_enc.c" there is a variable called "qp". I added in this file in the istruction printf to display this varaible. I redid after : ". / configure" and "make" and it works as well. The Result of this compilation gives no executable file. I would like to know why the printf that I added in the code is not displayed ?

• Modify code so each snippets start from begin instead end

  13 décembre 2022, par Ohiowizard

  source : https://davidwalsh.name/video-preview#comment-515168
  
the part of code that trim videos into snippets :

  


   # Loop and generate video snippets
    mkdir $tempdir
    interval=$(($length/$desiredsnippets-$starttimeseconds))
    for i in $(seq 1 $desiredsnippets)
    do
        # Format the second marks into hh:mm:ss format
        start=$(($(($i*$interval))+$starttimeseconds))
        formattedstart=$(printf "%02d:%02d:%02d\n" $(($start/3600)) $(($start%3600/60)) $(($start%60)))
        echo 'Generating preview part ' $i $formattedstart
        # Generate the snippet at calculated time
        ffmpeg -i $sourcefile -vf scale=$dimensions -preset fast -qmin 1 -qmax 1 -ss $formattedstart -t $snippetlengthinseconds -threads $(nproc) $tempdir/$i.mp4
    done


  


  `

  


  Video length is 3600 (60mins)
  
Desired snippets = 30, that mean 2mins each
  
It always start at 0:02:00 to 0:04:00 -> and so on
  
but i want it start at 0:00:00 (1st snippet) -> 0:02:00 (2nd snippet) -> (this put in code because it said invalid code format)

  


  

  • I want to make it trim from start of each snippets instead end of each snippets.

  


  • This code trim video into multiple parts(snippets) that set by user, and then merged all snippets into one video.