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• getruntime() exec() with double quotes in command

  29 décembre 2012, par brux

  I want to execute an ffmpeg command, the method I am using works with every command on my list except the following one which contains double quotes to set a filter (-vf) parameter

  ffmpeg -i 2012-12-27.mp4 -vf "movie=bb.png [movie]; [in] [movie] overlay=0:0 [out]" -vcodec libx264 -acodec copy out.mp4

  I have tried changing the quotes for single quotes with no luck. The command works at the android terminal with both single and double quotes.

  The app I'm developing uses about 5 ffmpeg commands, all work except this one, is this some bug ?

  I can't find a concrete solution to this problem, breaking the args into an array and then passing this to runtime().exec() as suggested elsewhere doesn't seem to work, or simply trying to escape the quotes with \" won't work.

  Both of the files referenced in the above command are located in the sdcard, I removed the concatenation of the command out so that things don't get messy, rest assured these commands work in a terminal when referencing the full paths to the files.
  I contatenate the string passed to getRuntime().exec() using a stringbuilder and`getexternalstorageDirectory().getabsolutepath() to get the path to each file like I have been doing with previous commands when using the process class.

  I am using Jelly Bean 4.2 in case that is of any significance.

• How to extract single image (with different name each time) from multiple videos in the one folder using ffmpeg bash script

  15 juillet 2014, par morriscotty_sd

  Let’s start with this... I’m fairly new to Linux.

  I have been looking into ffmpeg to extract an image from a video using the terminal. I’ve accomplished this using this piece of code :

     ffmpeg  -itsoffset -4  -i oggvideo.ogg -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 oggThumb.jpg

  I run this when I’m in the directory which holds the videos in my project. But what I want is to extract an image from all videos in that folder at the same time, naming the image corresponding with the video name it’s extracted from. My end goal is to have a folder which will hold videos that a user uploads, and at a certain time the script will run and extract images from the uploaded videos, saving the image path to a database.

  I found this line of code :

  for %%i in (*.mp4) do ffmpeg -ss 20 -i %%i -t 1 -s 590x340 -f image2 %%i.jpg

  from this site : Trying-to-extract-1-image-from-multiple-videos-with-FFMPEG

  I run that in the terminal and it gives me the error : ’bash : syntax error near unexpected token `(’’
  I tried removing the ’( )’ but then it just takes me onto a new line. This is where I’m having the most problems due to being relatively new to linux commands.

  Any suggestions or advice would be very helpful.

• Problems with ffmpeg build in Xcode

  16 décembre 2016, par jon

  Hi I have a problem with getting ffmpeg libraries to build in my Xcode project. It is in C++ . I have installed it using homebrew and have checked that all the correct libraries have installed via terminal. I have tried with and without extern C as I know it is a c library.

  #include <iostream>
  
  #include <opencv2></opencv2>opencv.hpp>
  
  
  
  #include <libavformat>
  
  
  
  //extern "C" {
  
  //    #include <libavformat>
  
  //}
  
  </libavformat></libavformat></iostream>

  The linker flags have been set by using (e.g. pkg-config —libs libavcodec) in terminal and these flags do not throw up an error when building. The header files are also found with no problems as the autocomplete flags them top while typing.

  Please see attached pictures for Xcode build settings. Really stuck pease help