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• Segmenting video into different parts and unique rendering on each part then concat afterwards

  2 mars 2016, par goudarziha

  I currently have a very poorly performing application that splits up a video, renders it and the concats all rendered videos on android using ffmpeg

  So I am running into issues with segmenting a video up into 5 parts at each different intervals/durations, rendering each video segment uniquely slowing up/speeding up and then finally concat all the segments back into one final video.

  Currently I am doing each part separately -

  Segmenting -
  example for one segment
  -y -i pathIn -ss 0.0 -t 2.0 -vcodec copy -acodec copy -an pathOut

  Rendering - example slowing down/speeding up
  
   y -i path -filter:v setpts=2.0*PTS pathOut

  Concat -
  
   f concat -i input1.mp4 -i input2.mp4 -i input3.mp4 -i input4.mp4 -i input5.mp4 -c copy output.mp4

  Right now I am running different separate thread for each editing of video, so 3, segment, rendering and concat.

  I am trying to get this all done on one command ffmpeg line if at all possible, if not just the segmenting and rendering of the videos and kick of the concat cmd line later.

  I am trying to emulate something similar to this https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs

• How do we determine the required dependencies for ffmpeg

  15 mars 2021, par user3656901

  I've installed ffmpeg on ubuntu. I am going to copy the compiled ffmpeg and required dependencies to a directory and copy that directory to another machine. This way we can run ffmpeg on another machine without installation. How do we determine the required dependencies to copy ? Saw instruction on this page : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu, but it didn't explain the required dependencies for ffmpeg.

  


  When I used ldd ffmpeg, I got something like :

  


      linux-vdso.so.1 (0x00007fffe20fd000)
    libavdevice.so.58 => /lib/x86_64-linux-gnu/libavdevice.so.58 (0x00007fc116e90000)
    libavfilter.so.7 => /lib/x86_64-linux-gnu/libavfilter.so.7 (0x00007fc116b10000)
    libavformat.so.58 => /lib/x86_64-linux-gnu/libavformat.so.58 (0x00007fc116890000)
    libavcodec.so.58 => /lib/x86_64-linux-gnu/libavcodec.so.58 (0x00007fc1152d0000)
    libavresample.so.4 => /lib/x86_64-linux-gnu/libavresample.so.4 (0x00007fc1152a0000)
    libpostproc.so.55 => /lib/x86_64-linux-gnu/libpostproc.so.55 (0x00007fc115270000)


  


  Are those the required dependencies ? It didn't list the files under bin, include or share folders.

  


• sh : ffmpeg : command not found when run command through php

  21 septembre 2018, par Vivacity InfoTech

  I have installed successfully installed FFMpeg on root of my Centos 6 machine (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos).

  My workplace of apache/php is /var/www/html

  Now I’m running below command successfully on /var/www/html directory to capture frame from the video file. It’s capturing a frame.

  [root@localhost html]# ffmpeg -i video.mpg -an -ss 30  -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 160x100 frame8  2>&1

  I want to run this command through php and using shell_exec() or exec() php functions. My php code for running the command is :

  $cmd = "/root/bin/ffmpeg -i /project/app/webroot/videos/video.mpg -ss 00:00:14.435 -f image2 -vframes 1 /project/app/webroot/videothumbnails/example-thumb.jpg";
  
  $locale = 'en_IN.UTF-8';
  
  setlocale(LC_ALL, $locale);
  
  putenv('LC_ALL='.$locale);
  
  echo shell_exec($cmd);

  When I’m trying to run command through above php code, I’m getting below error :

  sh: ffmpeg: command not found

  Please help me to solve out this problem.