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• Given 2 input videos of different lengths at 60 FPS with multiple common sections in between, what is the best way to sync them at the common section ?

  27 janvier 2024, par PirateApp

  
input vs output

  


  

  • In my actual case, there are 4 videos (basically gaming videos recorded from 4 different machines)

  


  • Each video may start or end at different duration (manually controlled by people starting and stopping recording and therefore their lengths vary slightly)

  


  • Each video has one or more common sections (basically a cutscene playing at the same time)

  


  • The distance between the common sections is the same in every video

  


  • How do I sync the videos at the common section ?

  


  • Basically I want to create a split screen video such that the common part plays at the same time on all the sub parts of the video

  


  • Keep in mind that the common sections wont be EXACTLY equal (because of graphics differences between machines but highly similar like dx9 vs dx11 or gamma)
What have I tried ?

  


  • Naive approach

  


  • Start video 1 at 0, start video 2 at 0.017, render the whole thing and check if it is in sync

  


  • Start video 1 at 0, start video 2 at 0.033, render the whole thing and check if it is in sync

  


  • Basically loop through the length of the video at each frame interval, render the full video and check if we get a synced version

  


  


  This sounds like a terrible idea honestly

  


    for (t1 in length of video a) {
    for (t2 in length of video b) {
       render a video with a and b starting at t1, t2 respectively
       increment t2 by 0.017 for b
    }
    increment t1 by 0.017 for a
  }


  


  Final output with 4 videos should look like this all synced at common sections


  


  Any better ideas ?

  


• FFMPEG-Php installation on Amazon EC2 linux AMI

  5 mai 2015, par Hamza

  I have installed FFMPEG on Amazon EC2 Linux AMI using this script now I am trying to install FFMPEG-PHP and after ./configure it gives me this error on make command

   # make
  
  /bin/sh /opt/ffmpeg-php-0.6.0/libtool --mode=compile cc  -I. -I/opt/ffmpeg-php-0.6.0 -DPHP_ATOM_INC -I/opt/ffmpeg-php-0.6.0/include -I/opt/ffmpeg-php-0.6.0/main -I/opt/ffmpeg-php-0.6.0 -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -I/usr/local/include/ffmpeg  -DHAVE_CONFIG_H  -g -O2 -Wall -fno-strict-aliasing   -c /opt/ffmpeg-php-0.6.0/ffmpeg-php.c -o ffmpeg-php.lo
  
  libtool: compile:  cc -I. -I/opt/ffmpeg-php-0.6.0 -DPHP_ATOM_INC -I/opt/ffmpeg-php-0.6.0/include -I/opt/ffmpeg-php-0.6.0/main -I/opt/ffmpeg-php-0.6.0 -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -I/usr/local/include/ffmpeg -DHAVE_CONFIG_H -g -O2 -Wall -fno-strict-aliasing -c /opt/ffmpeg-php-0.6.0/ffmpeg-php.c  -fPIC -DPIC -o .libs/ffmpeg-php.o
  
  
  
  
  
   In file included from /opt/ffmpeg-php-0.6.0/ffmpeg-php.c:42:0:
  
      /usr/local/include/ffmpeg/avcodec.h:43:21: fatal error: version.h: No such file or directory
  
       #include "version.h"

  I have searched this a lot but couldn’t manage to do it, Amazon support officer asked me to use CENTOS AMI instead of Linux AMI but I have everything hosted there, so I will appreciate if someone can help me with this.

  Thank you,

  Hamza

• How i apply ffmpeg code to apply watermark while converting video ?

  12 août 2017, par asif

  There are three options in video converter php script, before converting via ffmpeg on linux server.

  • 1.Video Quality
  • 2.Audio Quality
  • 3.Video Size

  For Quality, code lines in php are :

  <option value="2000000">high</option>
  
  <option value="1000000">medium</option>

  For Audio :

  option value="44100" >high
  
                    <option value="22050">medium</option>
  
                    <option value="11025">low</option>

  For Size :

  <option value="640x360">640x360</option>
  
                    <option value="854x480">854x480</option>
  
                    <option value="1280x720">1280x720</option>

  Likewise conversion code is :

  if($new_format=="mp4"){ $call=$ffmpeg." -i ".$video_to_convert."  -vcodec mpeg4 -r 30 -b ".$quality." -acodec libmp3lame -ab 126000 -ar ".$audio." -ac 2 -s ".$size." ".$converted_vids.$name.".".$new_format." -y 2> log/".$name.".txt";}
  
  enter code here

  I saw on 1 site

   [1]: http://hd69.info/process.php?uploaded_name=11~1.mp4

  They have applied watermark code line< i am doing the same but results an error, put code lines in the video quality just like they did, putting this code in video quality options :

  -i watermark.png -filter_complex 'overlay=main_w-overlay_w-10:main_h-overlay_h-10'

  I am getting errors, please help how i do like that [site]