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• FFMPEG : Extracting 20 images from a video of variable length

  12 novembre 2013, par Vapire

  I've browsed the internet for this very intensively, but I didn't find what I needed, only variations of it which are not quite the thing I want to use.

  I've got several videos in different lengths and I want to extract 20 images out of every video from start to the end, to show the broadest impression of the video.

  So one video is 16m 47s long => 1007s in total => I have to make one snapshot of the video every 50 seconds.

  So I figured using the -r switch of ffmpeg with the value of 0.019860973 (eq 20/1007) but ffmpeg tells me that the framerate is too small for it...

  The only way I figured out to do it would be to write a script which calls ffmpeg with a manipulated -ss switch and using -vframes 1 but this is quite slow and a little bit off for me since ffmpegs numerates the images itself...

  Any suggestions or directions ?

  Thanks,
  Vapire

• executing ffmpeg command with getRuntime().exec() command

  12 mai 2015, par Iori

  i want to run ffmepg command directly on android.
  a simple command

  ffmpeg -i vid.mp4 out.mp4

  now the issue is that i have searched the internet and found the best android ffmpeg can be found here

  http://bambuser.com/opensource

  I have downloaded it and read the readme file and compiled it. the folder is ffmpeg. I have kept it in <--projectfolder-->/ffmpeg/

  there is a ffmpeg executeable file in ffmpeg folder called ffmpeg folder

  i have copied it in files folder and run this command

    try {    
  
  
  
      Toast.makeText(this, "Working", Toast.LENGTH_SHORT).show();
  
  
  
      Process p = Runtime.getRuntime().exec("/data/data/com.koder.testffmpeg/files/ffmpeg -i /sdcard/vid.mp4 /sdcard/out.mp4");
  
  
  
  
  
      } catch (IOException e) {
  
  
  
      txt.setText(e.toString());
  
  
  
      Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
  
  
  
      e.printStackTrace();
  
  
  
      }

  according to this link
  How do I reduce the video size captured by the default camera using FFMPEG in Android ?

  but still it does not work always exception i dont know what is going wrong
  can someone plz help me with this

  java.io.IOException: Error running exec(). Command:[/data/data/com.koder.testffmpeg/files/ffmpeg -i /sdcard/vid.mp4 /sdcard/out.mp4] Working Directory: null Environment:null

• Adding Documentation of a library to manual pages

  30 décembre 2012, par Appy

  I am working with Ubuntu 12.04.1 . I am learning to make a basic video player using FFmpeg library in C . My manual pages don't show any entries for the headers/functions of the library . Can someone please show me a way to add the documentation to my manual pages .
  It is much easy to search that way than searching on a web page everytime .

  PS : I have tried to add documentation to man pages using Synaptic package manager . I installed a ffmpeg-doc package . But it doesn't seem to work .

  Thanks .