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• 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.

  


  


• FFMPEG — Create New Audio File using aselect filter API call in C code

  17 juin 2021, par AfricanMamba

  I have been working on an a program in C that invokes the use of FFMPEG's libraries to remove some segments of audio from a given audio file. I have created the filter successfully using the API call, const AVFilter* aselect = avfilter_get_by_name("aselect"), linking it with abuffersrc and abuffersink.

  


  However, I am not sure entirely sure what to pass in to the arguments when creating the filter because when I pass in the argument string, "'between(t,10,32)', asetpts = N/SR/TB output.wav", it gives me an error saying : "Invalid chars ',asetpts=N/SR/TBoutput.wav' at the end of expression"

  


  But when I pass in just "'between(t,10,32)'" as the arguments for the filter, the program compiles and runs but no output file is created with just the audio from 10 seconds to 32 seconds. Does anyone happen to know if it is even possible to use the aselect filter API to create new audio files or if there is an example that exists showing how to copy only frames from one audio file to another ? Thanks !

  


• I've download ffmpeg source code,but I don't know how to use it on anroid

  23 octobre 2013, par Sravanthi Pasaragonda

  I've download ffmpeg source code,but I don't know how to use it on anroid.I need to remove audio from vedio file and i need to add other audio to vedio.This is my Task .I am using ubutu 10.04 ,And i have installed NDK-r9,ffmpeg and yasm 1-2.0 in my system.
  please any sample process to how to start ffmpeg example,i have downloaded lot of example from GITHUB Like

      https://github.com/appunite/AndroidFFmpeg
  
      http://www.roman10.net/how-to-build-android-applications-based-on-ffmpeg-by-an-example/
  
      https://github.com/mconf/android-ffmpeg
  
  
  
  
  
  
  
  But i dont no how to complie all projects using ffmpeg.

  Please give me step by step process for any ffmpeg example in ubutu.

  Thanks