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• bash script fail when a command wait ffmpeg to finish

  5 novembre 2013, par d4r10

  In ubuntu 13.04 have a node.js server that launch for certain events, a script like this :

  #! /bin/bash
  
  ...
  
  ...
  
  
  
  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm"
  
  
  
  y_uid=$(/app/youtube-uploader "$folder/$dif.webm" "$label" "$desc" | grep 'watch' | sed 's/v=/ /g' | awk '{print$2}')
  
  
  
  echo "$y_uid" >> ~/log/yt.log
  
  ...
  
  ...

  if avconv (ffmpeg) process a small file (less then 30 minutes of encoding), the script works fine, but if avconv runs for hours, the next command "...youtube-uploader..." (that is a python based application) doesn't work (but if i try to launch it manually, it will go fine).

  I have also tried to launch the next command inside a loop that check if the variable "$y_uid" is empty, so it will try to repeat youtube-uploader until it find a right value, but it will continue to stay in background and will try forever.. (and it is strange, because if i try to launch the command manually, it works fine..).

  Summarizing, seems like that if avconv run for hours, the avconv process will generate a file that is not recognised or locked or a ghost file for the same script (but is recognised if the command is launched outside the script), if it is a small encoding, it will work fine.

  Unfortunatelly It is difficult to debug or test, because i have every time to wait for hours, please help !

  UPDATE

  I think the problem is related at the buffer size of node.js OR some other buffer that store the standard output of ffmpeg. Just correct

  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm"

  in

  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm" &> /dev/null

  so all the ffmpeg output not full the buffer memory and everythings go well

• Automatically inject 360° 3D metadata into a video with a Bash script

  27 octobre 2019, par Eduardo Perez

  So, I have a Cygwin script I made which concats several videos into a single video with different variations, and I want to inject stereoscopic 3D metadata into the videos through the script so I don’t have to inject each video separately using Google’s injector tool. The videos are all 360° videos with top/bottom 3D and standard stereo audio rather than spacial audio, and in an MP4 container. Is there any way that I can either inject the needed 3D metadata using FFmpeg so I can upload it to YouTube as a 360VR video, or use the source code of Google’s injector tool or some other tool in order to inject the metadata the same way that Google’s injector tool would so it’s supported as a 360° 3D video by YouTube ?

  Also, will the injector tool automatically move the MOV atom to the beginning of the file (if the injector tool is used) or will I still need to use -movflags +faststart in FFmpeg ? The videos are kind of big and apparently using FFmpeg to concat several video files together and copy the stream codecs with -movflags +faststart and then injecting the metadata using Google’s Spherical Media tool is three times longer than just using FFmpeg in the same way but without -movflags +faststart, so if there was a fast way to do this I’d greatly appreciate it.

• Command works in SSH terminal, but not in PHP script

  13 janvier 2017, par Ryan Butterworth

  I’m having a weird problem. I have installed ffmpeg on my server. When I run "ffmpeg" from SSH (PuTTY) it confirms the install :

  

  Then I placed the following code in a PHP file, inside a website on the same server :

  <?php
  
  ini_set('display_errors', 1);
  
  ini_set('display_startup_errors', 1);
  
  error_reporting(E_ALL);
  
  
  
  $output = exec('ffmpeg -h');
  
  echo "<pre>$output</pre>";
  
  ?>

  However when I run the PHP script, the page is blank, there is no output. I can confirm that exec is working fine, because when I run php -v | grep cli both in PHP and in terminal, they both output the same thing.

  I am using Plesk (web host edition) to manage the site, and have given it access to the server over SSH (/bin/sh)

  What am I missing here ?