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• Php and Mysql current video time duration using FFMPEG

  10 novembre 2014, par innovation

  I have one question about video time calculator.

  I am using this FFMPEG

  shell_exec("ffmpeg -i ../videos/$video_name.flv -f flv -s 320x240 ../videos/$video_name.mp4");
  
  shell_exec("ffmpeg -i ../video_images/$video_name.mp4 -vcodec png -ss 00:00:05 -s 360x288 -vframes 1 -an -f rawvideo ../video_images/$video_name.png");

  I want to add here to post total duration of the video.

  For example : I upload a video this video time 4:10 (4 minutes 10 seconds). I want to post it this time from table row.
  How can i do this anyone can tell me ?

• doc/APIchanges : fix weird reindent

  2 février 2014, par Stefano Sabatini

  doc/APIchanges : fix weird reindent
  

  • [DH] doc/APIchanges

• 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 ?