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• Video (generated with FFMPEG) scrambled after upload to YouTube

  12 mai 2023, par user2338826

  I am generating short videos from screenshots (e.g. 900 screenshots for a 30 seconds clip) with ffmpeg.

  


  It works great and I can play the videos in different video players on Windows without a problem.
When I upload the video to my YouTube channel it still works fine in the small preview under studio.youtube.com. But as soon as I preview the video on YouTube the whole video is "scrambled" (see attached image).

  


  Other YouTube videos uploaded by other users play fine in my Chrome.

  


  I am using Chrome and if I deactivate Hardware Acceleration in Chrome settings the video plays fine on YouTube. But that obviously is not a viable solution. Users should be able to watch the videos on YouTube without changing settings.

  


  The video also plays fine in the Android YouTube app and in Firefox on Windows.

  


  I have tried a lot of settings for ffmpeg - no success.

  


  This is one of the commands I have tried. The parameters are used according to YouTube's best practice requirements :

  


  ffmpeg -r 30 -s 1080x1920 -i storage/screenshot-%03d.jpg -pix_fmt yuv420p -c:v libx264 -profile:v high -preset slow -crf 18 -g 30 -bf 2 storage/testvideo.mp4


  


  Has anybody successfully generated YouTube videos that also run in Chrome ?
Any idea appreciated.

  


  

  


• ffmpeg causes browser to hang up ?

  24 juillet 2012, par Itai Sagi

  I'm using ffmpeg to convert videos on the fly, as they say, and I'm facing with a very annoying, unsolvable and unreferenced problem (as of yet ;) ), when I run my php script, it basically works - takes the file, uses ffmpeg, starts converting it, but halway through it's finished, the browser hangs, I don't understand why or how to resolve it :
  (even with set_time_limit the bastard won't work).

  function convertToMp4(){
  
      /*
  
       * Converts a file to mp4, returns the new file name
  
       */
  
      set_time_limit(0);
  
      $tmpFile = $this->fileName;
  
      $newFile = uniqid();
  
      $outputFile = "output/$justFile.mp4";
  
      exec("ffmpeg -i " . $tmpFile . " -acodec copy -ar 44100 -ab 96k " . $outputFile. " &");
  
      unlink($tmpFile);
  
      return $outputFile;
  
  }

  Ideas ?

• nginx-rtmp module with ffmpeg

  1er janvier 2017, par sara

  I am new in video live streaming.I searched and found nginx-rtmp module to create a my media server,
  when i saw that ,
  i understood that we can run ffmpeg command in ngnix to transcode my video , or create a hls-variants , and this commands apply on videos on the fly . am i true ?
  
  if it is true , so with large video it takes a long time to tarnscode on the fly .so i wanna to execute my ffmpeg command when i sotre my video in my hls file path. so i create a hls files(.ts) first with running ffmpeg commands.and then i serve my files with ngnix-rtmp module.
  
  now my question is this 2 approaches(run async and sync(on the fly) ffmpeg command ) are true ?
  i saw a lot of example that implement first approach.and i interested in using second approach .second approach is not a common approach ?why ?is this approach has a problem and issue that i am not aware of that ?
  tnx